MoparFins

Techical Discussions => Tech- - DRIVE TRAIN => Topic started by: Stan Paralikis on November 22, 2009, 01:15:32 PM

Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 22, 2009, 01:15:32 PM
 
CLARIFICATION:
Changing the ring and pinion in a 9 1/4 rear...
Am I able to do it or should I bring it to a shop?
 
I know that this tool will be needed:
 
(http://ecx.images-amazon.com/images/I/21%2BLUJsIX9L._SS500_.jpg)
 
Commando12010-03-23 16:22:57
Title: 9 1/4 rear: Running great!
Post by: Steve on November 22, 2009, 01:57:12 PM
I don't think it will fit in the housing
Title: 9 1/4 rear: Running great!
Post by: Leaburn Patey on November 22, 2009, 02:04:36 PM
.
Stan,follow your gut feeling..
If you feel uncomfortable --let the pros handle it.
You do have the advantage that the Formals and Ram trucks shared the same rear axle and parts are readily available and a choice of final drives,and Sure Grip options.
Trucks have used  the 9-1/4 right up until  a couple years ago
Title: 9 1/4 rear: Running great!
Post by: Stitcherbob on November 22, 2009, 02:33:55 PM
You might need a special tool (but it's relatively easy to make) to spread the case open a tiny bit to get the guts in and out.....it 's basically a bar with 2 pegs welded to it and a heavy duty turnbuckle welded in there to open the case. Then you have to go through all of the adjustments steps, which can get tedious.

here's a how to:
http://www.off-road.com/trucks4x4/article/articleDetail.jsp?id=194353 (http://www.off-road.com/trucks4x4/article/articleDetail.jsp?id=194353)


http://www.hemmings.com/mus/stories/2005/12/01/hmn_feature25.html?t=printable (http://www.hemmings.com/mus/stories/2005/12/01/hmn_feature25.html?t=printable)
http://www.moparaction.com/Tech/questions/BEEFY.html (http://www.moparaction.com/Tech/questions/BEEFY.html)


Title: 9 1/4 rear: Running great!
Post by: Steve on November 22, 2009, 04:28:46 PM
The big question is why?  The 8 3/4 can handle a hello lot more than you have.
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 23, 2009, 02:46:12 AM
Quote from: POLARACO
The big question is why?  The 8 3/4 can handle a hello lot more than you have.
Wake up. Steve!(http://www.massmopar.com/yabb/Smilies/bangbang.gif)

The rear in  The NYB  is a 9 1/4  and the ring and pinion I have that I want to swap in is for a 9 1/4.
Title: 9 1/4 rear: Running great!
Post by: Steve on November 23, 2009, 05:04:35 AM
Duhhhhhhhhh   Too new for me. . .  Yer right . . . Shake Shake Shake
Title: 9 1/4 rear: Running great!
Post by: Snotty on November 23, 2009, 08:47:34 AM
Stan, would it be easier to find another rear with the ratio you want and just swap them?
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 23, 2009, 09:44:36 AM
Quote from: Snotty
Stan, would it be easier to find another rear with the ratio you want and just swap them?
Changing an entire rear is EASIER than changing just a ring & pinion?
Besides, I have the ring and pinion already....
Title: 9 1/4 rear: Running great!
Post by: Steve on November 23, 2009, 11:43:55 AM
The smart answer is find an old timer at a stealership and have them do it.  He'll probably have all the tools and has done one or two before.
Title: 9 1/4 rear: Running great!
Post by: Snotty on November 24, 2009, 09:21:35 AM
Quote from: Commando1
Changing an entire rear is EASIER than changing just a ring & pinion?
 
I've done it twice and would say... Yes!  Unless you're dealing with a rear where you can swap the entire third member like a Mopar 8.75 or Ford 9" I find the two hours of work swapping the entire rear to be a better/easier route than taking the time, money, and expertise to swap the ring and pinion.
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 24, 2009, 10:42:23 AM
Hmmmmmmmmmmmmmmm... Interesting.
BUT, I don't have an extra 9 1/4 3.55 laying around....
Title: 9 1/4 rear: Running great!
Post by: Steve on November 24, 2009, 11:31:06 AM
If you know what you are doing it's not that bad.  The hardest part is setting up the tolerances.
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 24, 2009, 01:42:24 PM
If I knew what I was doing, I wouldn't have asked in the first place.
 
Maybe I should rephrase the question.  Who has done it?
Title: 9 1/4 rear: Running great!
Post by: Stitcherbob on November 24, 2009, 05:07:45 PM

stop yer bellyache'in and dive in.....what could go wrong?


oh yeah...  (http://www.moparfins.com/forum/attachments/10/oops1.JPG)


Title: 9 1/4 rear: Running great!
Post by: Steve on November 24, 2009, 05:29:56 PM
I've done a few 8 1/4's and a couple of 7 1/4's, but never a 9".
 
I would get a kit with bearings, shims/crush washers and seals along with the gears.  Then follow the FSM.  You'll need a dial indicator to set the end play of the pinion and lash on the ring.
 
It will go, but not set up right, it will make noise.  The good thing is you have a lift.  I do this Shtuff on my back.
 
BTW, the ring gear bolts are left handed
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 25, 2009, 02:21:04 AM
Quote from: POLARACO
I NEVER would have known that.
Title: 9 1/4 rear: Running great!
Post by: Butch Houghton on November 25, 2009, 04:45:29 AM

The hardest thing to set is the pinion depth.    When you don't have the right depth setting tool the smart thing is to re-use the original shims at the rear of the pinion.

The bad thing is the shims are behind the rear pinion bearing & it's pressed on & off so if it's off you have to pull it to change them.  Starting with the originals ( with a factory gear especially ) is usually gonna get you really close.   The front bearing just slips on.  Then there's the crush sleeve,  it's a one-time only use so if it's wrong you replace it.   I don't know if they make a solid spacer like they do for a 489 8 3/4.

the adjusters in the carrier make that an easy one,  after they're snugged up you use the dial indicator w/ a mag base to start checking the backlash ( usually around .008 ) ,   you turn one adjuster in & the other out thus moving the carrier left or right to get the backlash.

You'll need some way to hold the yoke when tightening the pinion nut,  close to 200ftlbs If I remember.   What ever the book says.   Ring gear bolts left handed as Steve said & make sure the carrier bearing caps are marked so as to go back in the original positions.

If it was me I'd use the original shims ( or measure them & use new ones of the same thickness ) & try it.   I bet it'll be OK.

Forgot,  we just make the carrier adjusting tool to use on a 8 1/4.    Long pipe with a handle at the end & a hex at the other but then if that tool is that cheap I'd just buy it!

Butch

HemiFury2009-11-25 09:48:32
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 25, 2009, 05:22:26 AM
(http://www.rch.org.au/emplibrary/diabetesmanual/8_dizzy.gif)
Title: 9 1/4 rear: Running great!
Post by: Steve on November 25, 2009, 06:22:43 AM
Toad ya
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 25, 2009, 07:18:45 AM
Can YOU do it?????
Title: 9 1/4 rear: Running great!
Post by: Snotty on November 25, 2009, 09:58:45 AM
Stanley, my Brother-in-law has the same dilemma with his Camaro.  He wants to dump the 4.10s for a set of 3.26s.  I suggested he find a guy who has that set on his car and do a swap.  Heck, I told him I'd come to his house and do it for him/them.  But, he not wanting to do so I suggested he ask around and see what the price would be at a shop.  He found a shop that would do the swap - performing all of the work - for less than $900.00.  I told him that's a great deal!  The shop has a great reputation in the Sacramento area.
 
I know this much, I would not attempt to do that job with so much at stake.  It seems daunting, and I'm sensing the same by your previous post. 
 
Is there a shop in your area that would do the job?
 
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 25, 2009, 12:14:45 PM
Quote from: Snotty
I know this much, I would not attempt to do that job with so much at stake.  It seems daunting, and I'm sensing the same by your previous post. 
 
Brother Snotty,  I have seen the light.  Your inspiring words from the pulpit have made me understand what I must do!
 
Is there a shop in your area that would do the job?
 
[color=#ff00ff size=3]YES!!!!!!!!!!!!!!!!!!!!!![/color][/b]
Title: 9 1/4 rear: Running great!
Post by: Butch Houghton on November 26, 2009, 05:48:59 AM
Well,  there ya go....if you're not at all comfortable then let a good shop do it.

If it was an entire rear swap that's a piece of cake.    As long as the rears are from the same exact car.   The hard part is finding one for your particular car with the gear you want & not already worn out to where you wind up having to replace the bearings anyway.

This way at least you'll know it's all fresh inside.

Butch


Title: 9 1/4 rear: Running great!
Post by: Steve on November 26, 2009, 06:44:57 AM
Sheeesh
 
I said that
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on November 26, 2009, 07:29:30 AM
Yha. but I need constant affirmation.
Title: 9 1/4 rear: Running great!
Post by: Steve on November 26, 2009, 03:23:17 PM
Stinker. . .
 
I can do it, but it will be in January if I have the time.  Supposed to go to Miyammie at the end of January
Title: 9 1/4 rear: Running great!
Post by: Snotty on November 28, 2009, 08:44:24 AM
Quote from: Commando1
Quote from: Snotty
I know this much, I would not attempt to do that job with so much at stake.  It seems daunting, and I'm sensing the same by your previous post. 
 
Brother Snotty,  I have seen the light.  Your inspiring words from the pulpit have made me understand what I must do!
 
Is there a shop in your area that would do the job?
 
[color=#ff00ff size=3]YES!!!!!!!!!!!!!!!!!!!!!![/color][/b]
 
Very well, I'll accept your offering while singing the closing Hymn.  :-)
Title: 9 1/4 rear: Running great!
Post by: Steve on November 28, 2009, 05:05:17 PM
better tape up the window to prevent flying glass if you sing
Title: 9 1/4 rear: Running great!
Post by: Snotty on December 01, 2009, 11:45:22 AM
Yes, my voice is POWERFUL!!!


Title: 9 1/4 rear: Running great!
Post by: Steve on December 01, 2009, 02:00:37 PM
Yeah we know. . .there was a mass exidus from New York harbor when you were here for church.
 
Thank goodness for safety glass
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 01, 2010, 09:14:44 AM
I said screw it.  If Steve can do it, any numbskull can do it so that includes me despite my distribulexia.  I'm getting bored, haven't broken anything for a while, so I'm going in and swapping out the ring & pinion.
 
First things first.  I need to fabricate this tool (cuz I'm too cheap to buy it).  It looks like a socket on a pipe.  So whatizzit really?  How do I fab one of these things up?
 
(http://ecx.images-amazon.com/images/I/21%2BLUJsIX9L._SS500_.jpg)
 
 
Title: 9 1/4 rear: Running great!
Post by: Steve on March 01, 2010, 10:19:01 AM
That is supposed to go down the tunnel and get to nuts on the end of the Carrier.  I don't know that you need it unless the instructions say so. . . .

My I suggest using several long 1/2 drive extensions? You will probably need 4 or 5. You can duct tape them to make them rigid at the joints.  You must have a harbor freight near by, or wal-mart.  You only need it once. . .   Then it's just a matter of finding out the hex size.



 
Simple enough?
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 01, 2010, 11:08:49 AM
Quote from: POLARACO
 I don't know that you need it unless the instructions say so. . . .
[color=#ffff00 size=2]Yes.  The instructions say so.  I'm going to follow the FSM on this.  [/color]
 
. . .   Then it's just a matter of finding out the hex size.
[color=#ffff00 size=3]...thus the reason of my post ??[/color] (http://www.massmopar.com/yabb/Smilies/poke.gif)
 
Simple enough?

 
Commando12010-03-01 17:11:56
Title: 9 1/4 rear: Running great!
Post by: Snotty on March 01, 2010, 01:08:02 PM
Stan, Chris "the Doctor" Fredriksen could do that for you.  Unfortunately he's here in Bakerisfied.  :-(  My son has decided to pay Chris to turn our 3.55 8.75 third member into a sure-grip.  It's his money! 
 
Good luck doing that your self.  Be careful!
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 01, 2010, 01:15:02 PM
Quote from: Snotty
I have The Best and the Brightest covering my back.
 
3:15 A.M. :  Um...hello?  Steve?
Commando12010-03-01 18:16:59
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 02, 2010, 12:45:10 PM
...and while we're at it, PICK MY KIT:
 
(the minimum kit nec.  (http://www.moparfins.com/forum/smileys/smiley6.gif) "
 
http://ratech.stores.yahoo.net/ch9axinki.html (http://ratech.stores.yahoo.net/ch9axinki.html)
Title: 9 1/4 rear: Running great!
Post by: Steve on March 02, 2010, 01:41:37 PM
Quote from: Commando1
Quote from: Snotty
I have The Best and the Brightest covering my back.
 
3:15 A.M. :  Um...hello?  Steve?


ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ



POLARACO2010-03-02 18:41:53
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 03, 2010, 09:11:40 AM
Oh, that's OK about the tool, guys.  The guys over at Moparts told me how to make one...(http://www.massmopar.com/yabb/Smilies/whistling.gif)

 (http://www.moparfins.com/forum/attachments/32/DSC00001.JPG)
(http://www.moparfins.com/forum/attachments/32/DSC00002.JPG)(http://www.moparfins.com/forum/attachments/32/DSC00003.JPG)
Title: 9 1/4 rear: Running great!
Post by: Steve on March 03, 2010, 01:13:52 PM
sigh
 
I told you how to make one without all that on there.  Did you need the Hex? Or a socket?
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 04, 2010, 03:40:20 AM
Quote from: POLARACO
sigh
 
No you didn't.  I asked for SIZES.  I got silence from the peanut gallery.
It required me welding a 7/8" Heavy nut (1.41" hex head) welded to 3 ft of pipe with an old 1/2" drive socket welded to the other end.
 
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 12, 2010, 12:52:25 PM
D(iferential Day) -3: Countdown to Going In.
 
(http://www.moparfins.com/forum/attachments/32/DSC00001rp.jpg)
Title: 9 1/4 rear: Running great!
Post by: Steve on March 12, 2010, 01:05:45 PM
(http://www.moparfins.com/forum/smileys/smiley36.gif) (http://www.moparfins.com/forum/smileys/smiley36.gif) (http://www.moparfins.com/forum/smileys/smiley36.gif) (http://www.moparfins.com/forum/smileys/smiley36.gif)
 
(http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif)
 
This won't be as messy when you blow it up
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 12, 2010, 03:03:44 PM
What's your problem, pops
At least my projects get finished.(http://www.moparfins.com/forum/smileys/smiley17.gif)
Title: 9 1/4 rear: Running great!
Post by: Steve on March 12, 2010, 04:18:27 PM
mine do too.  And I don't need to carry a shovel and broom either! (http://www.moparfins.com/forum/smileys/smiley2.gif)
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 13, 2010, 02:30:01 AM
From what I have heard about your garage, you wouldn't know a broom if you fell over it.(http://www.moparfins.com/forum/smileys/smiley12.gif) 
Title: 9 1/4 rear: Running great!
Post by: Steve on March 13, 2010, 06:03:56 AM
Oh contrair
 
I know what the broom is, there just isn't room to move it.  I use a vacuum anyway
Title: 9 1/4 rear: Running great!
Post by: Dan Cluley on March 14, 2010, 01:14:57 AM
That sucks!
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 15, 2010, 12:13:35 PM
OK.  I dove in head first today.  Got everything apart.  Only hiccup was trying to pop the carrier out.  I called Steve.  He said it should literally fall out.  He DIDN"T tell me that I had to back off the side thrust bearings first.(http://www.moparfins.com/forum/smileys/smiley17.gif)  After I figured that out, it fell out.
I dropped the pinion gear to have the new bearing pressed on and I'll pick that up tomorrow morning.
 
Hey.  This is easy.  Why didn't everybody say so....(http://www.moparfins.com/forum/smileys/smiley2.gif)
 
(http://www.moparfins.com/forum/attachments/32/DSC00021.JPG)
(http://www.moparfins.com/forum/attachments/32/DSC00022.JPG)(http://www.moparfins.com/forum/attachments/32/DSC00023.JPG)(http://www.moparfins.com/forum/attachments/32/DSC00017.JPG)(http://www.moparfins.com/forum/attachments/32/DSC00018.JPG)
Title: 9 1/4 rear: Running great!
Post by: Stewart Van Petten on March 15, 2010, 04:45:01 PM
Hopefully it will go together the first time and you do not have too much trouble adjusting it to get the correct gear mesh and lash. I have done a few gear swaps but I was lucky my projects did not require much adjustment. Good luck setting up your new gears!
Title: 9 1/4 rear: Running great!
Post by: Steve on March 15, 2010, 05:18:54 PM
I told you I don't know an 9".  Sheeesh
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 15, 2010, 05:23:41 PM
That's OK.  Just hearing your assuring voice gave me the moral support to carry on...
 
"WHAT DO YOU WANT????"
(http://www.moparfins.com/forum/smileys/smiley2.gif)
Title: 9 1/4 rear: Running great!
Post by: Steve on March 15, 2010, 05:52:24 PM
(http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif)
 
I do that to Elaine too.  I can't go through a day without using 3/4 of a battery, or more.
Title: 9 1/4 rear: Running great!
Post by: Guests on March 15, 2010, 08:35:18 PM
The only thing fun is getting the torque on the pinion where it belongs, along with the shims. The book and everything I have seen is to start with what you have on it first, then adjust afterwards. Lash adjustment according to the book based on the painted pattern on the teeth, just follow the directions and you will be more than happy with the results.
 
By the way, what gears are you putting in? I missed that part.
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 16, 2010, 04:08:49 AM
3.55's.  Now that the power band got moved up, launching 4700 lbs with the 2.71 just wasn't cutting it for me.
Title: 9 1/4 rear: Running great!
Post by: Guests on March 16, 2010, 10:33:12 AM
Yeah, that will help.
Title: 9 1/4 rear: Running great!
Post by: Steve on March 16, 2010, 11:00:36 AM
Quote from: dana44
Yeah, that will help.

The 355's will.  But not the installer
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 16, 2010, 03:07:10 PM
Quote from: dana44
Yeah, that will help.


Shaddup you. I'm pizzed enough as it is.  I've got it all bolted back up  Now I'v e got a howler...
 
%$#%$%$ - IT !!!
Title: 9 1/4 rear: Running great!
Post by: Steve on March 16, 2010, 05:22:31 PM
Which way is it howling?  Loaded ot unloaded?
 
If you drill and tap the bottom, you can put a drain plug in.  Without the proper tools, you may be going back in a few times.  You need the touch
Title: 9 1/4 rear: Running great!
Post by: Guests on March 16, 2010, 06:47:58 PM
Always, check the preload pattern and compare it to all the different patterns to see where you are, the books all have pictures of what needs more, less, left and right. I don't know about everyone else, who seem to jab and kid you, but I have faith in your ability. I figure if you have the guts to go in, you have the guts to do it right.
Title: 9 1/4 rear: Running great!
Post by: Steve on March 16, 2010, 07:53:15 PM
You weren't here for the big one. . .But we'll save that for discovery.
 
I know he will do it. . . It's untested waters for Stan.  I know Stan the best of any of these guys. . .  He's done a good job so far, but paid a price.  Right Stan?  Proud of ya son.  LOL
 
As mentioned above, without the proper tools, you'll probably be going in there a few times.  Not your fault. . .  You got this far.  Almost there.
 
We need you to describ your scream.   Like I said, Drain plug is a good idea
Title: 9 1/4 rear: Running great!
Post by: Guests on March 16, 2010, 11:30:58 PM
Rule number one when fighting dirty is always kick a man when he's down, it's easier...... nice change to the title (that's a case of sarcasm there if you didn't catch it).



Stan, howling is usually bearings or metal touching metal when it isn't supposed to.
First thing to do is drop the driveline, drop the tires, pull the cover and look for pieces of metal. A slow rotate should show something chewed or extra shiny in a visual inspection, or a chatter on the surface against something. Once this is done, a pinion set too deep or shallow can make a howling, the axle C clip rod and set bolt can touch, preload on the sides can howl if the mesh is too tight, so telltale signs first, I'll keep an eye out here tomorrow to give a few pointers.
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 17, 2010, 04:54:21 AM
As far as the ribbing, I know when it comes from these guys, it comes with love.  Doesn't bother me a twit because It's all in fun.  I'd worry if there was no ribbing.
 
That aside, I waited all my life to retire so I could finally get down and dirty with my cars.  Did I absolutely have to change the gears?  Absolutely not.  I did it because I always wanted to and now I can (money mot withstanding - LOL).  I'm going to step back a few days and let my muscles recover and clear my head.  I'll dive back in and  (http://www.moparfins.com/forum/smileys/smiley9.gif)
Title: 9 1/4 rear: Running great!
Post by: Steve on March 17, 2010, 06:16:27 AM
I think what he is describing is probably gear lash.
 
If I could get him to explain what it's doing and when. . . .  .  He could have the gears too loose too
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 17, 2010, 06:35:54 AM
It's a totally audio thingie.  How do you describe a "whine"?
It whines when you go above 35 - 40.  Load or no load.
After I clear out my head in a few days, I'll go back in and start from scratch.
And don't yell at me when I call you.  You make me cry!
(http://i2.photobucket.com/albums/y45/Christopher4myspace/Emo%20Cat/l_50b7a152aa2040f1a80fdf08a60a9e-1.jpg)
Title: 9 1/4 rear: Running great!
Post by: Steve on March 17, 2010, 07:05:29 AM
Sounds like the gears may be too tight.  But they do quiet down after a while.  However, leaving them too tight will eventually wear the hardened surface off the gear face.  That would take thousands of miles.  I know mine made a mild whine at 60, and has been quieting down.  It took 12,000 miles on the 355's.
 
Now I need to change the rear bushing on the trans to get rid of my harmonic vibration.
 
I found a very low mileage (4500 Miles)  294 sure grip rear locally for $100 bucks.  I think I may go for that and put this rear in the 68.  The vert has 323's, sure grip, so I may go with that too.  Not sure until I drive it. 
 
POLARACO2010-03-17 11:08:44
Title: 9 1/4 rear: Running great!
Post by: Stewart Van Petten on March 17, 2010, 08:35:51 AM
When I have installed new pinion and ring gears I made sure that I had the correct mesh pattern in the test ink before I buttoned it up. Did it look like it was meshing properly when you did your install? Did you check with a dial indicator how much lash you had? Sometimes you still get some gear whine even when everything is setup correctly. I am not sure why though.
 
As the gears go through the break in process the machined surfaces go through a work hardening process. The surfaces that mesh get red hot and are quenched with the gear oil which makes the gear surfaces harder and more impervious to wear. This is why it is importand to let the differential cool down completely after some short runs and gradually it will break in. If the gears get too hot it can change the hardening process on the rest of the gear. If you pull the cover and inspect the gear closely if there are still machine marks on the gears then they are not fully broken in.
 
Good luck with your project!
Title: 9 1/4 rear: Running great!
Post by: Steve on March 17, 2010, 10:18:20 AM
Interesting
 
Stan. . If you don't have any dye, use some spray White Lith Grease.
 
Open her up, spray the greas on as far arpound as you can, and rotate it until it comes back out.  Then take the best picture you can of that and post it.  Leave it open until Stu, Ed or I get back to you.
Title: 9 1/4 rear: Running great!
Post by: Guests on March 17, 2010, 10:26:53 AM
Stan, I know the ribbing is all in love, but there seems to be a limit that ol' conservative me care to read, again and again and again. It all got buttoned up faster than I thought, so yeah, at this point, when the soreness goes away, white lithium grease paint the teeth on the ring gear and then rotate all the way around. The teeth aren't getting touched, or messing together toghether properly, and it is either shimming the pinion, unshimming the pinion, or changing the lash side to side, but gotta see what the pattern is to make the determination.
 
 
Title: 9 1/4 rear: Running great!
Post by: Steve on March 17, 2010, 01:40:20 PM
Whaaaa Whaaaaa (http://www.moparfins.com/forum/smileys/smiley2.gif) (http://www.moparfins.com/forum/smileys/smiley2.gif) 
 
He is right on target Stan.  That's why I asked for the picture
 
ED  FYI. . One of the reasons we rib on these threads is to keepm up on the baord so they don't get timed out.  We're not supposed to be farting around in the Tech section.
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 17, 2010, 02:29:52 PM
This is what I love about down here in Fumbuck County.  We have some great mom & pop businesses. 
I talked to a shop that specializes in drivetrains.  He said to bring it in, we'll put'er up, pop the plate and he'll l examine it with his expert eye.  I'll take it from there. 
And I feel safer that way.
Title: 9 1/4 rear: Running great!
Post by: Guests on March 17, 2010, 05:40:04 PM
I like he ribbing and the fun over here and all that, I am just a little sensitive about seeing abuse to a certain extent. There is ribbing and there is slamming a person because "everybody does it", so to Stan, good for you for putting up with the male cow excrement, I have your back.(http://www.moparfins.com/forum/smileys/smiley3.gif)
Ed
 
dana442010-03-17 21:42:47
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 17, 2010, 06:06:32 PM
Right now, as I look back, my money is on the pinion shims...
That's a real hassle because to add/subtract shims, you have to remove (and probably damage) the bearing and then press it back on.  Reinstall everything, and then do your measurements.  If not dead on, disassemble and repeat.  And in the meantime, you better have a stockpile of crush sleeves,  PLUS, going b&f to the machine shop 10 mi. away to pull and press the bearing...  Sheesh.
Title: 9 1/4 rear: Running great!
Post by: Steve on March 17, 2010, 06:31:01 PM
Thats why we asked you to take pictures.  We can tell.
Title: 9 1/4 rear: Running great!
Post by: Guests on March 17, 2010, 10:04:29 PM
The cover will be popped, the gear will be painted and then determine which direction it will have to move and it will be done with one more crush sleeve and whatever shims, or the side play will be adjusted and no pinion stuff will be left alone.
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 21, 2010, 12:59:39 PM
[TUBE]K4JhruinbWc[/TUBE]
Title: 9 1/4 rear: Running great!
Post by: Stewart Van Petten on March 22, 2010, 04:13:53 PM
How are you making out with your project? Make any headway?
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 22, 2010, 04:57:12 PM
Going in tomorrow morning.
Title: 9 1/4 rear: Running great!
Post by: Stitcherbob on March 22, 2010, 06:18:08 PM




E-berg said of the 9.25 rear:

"In a New York minute: I'd put in a stock Chrysler 9.25" axle from a later
Dak. Trouble free, strong, cheap parts, super-easy to service. And WAY
stronger than any of that FoMoCo or GrandMother garbage.
While not as strong as the Dana 60, it's quite a bit stronger
than the 8-3/4", lots cheaper and easier to find, and only slightly heavier.
The currently available Sure-Grip is even the Spicer clutch type!
Another plus is that it's a super-easy rear to work on. The
externally-adjustable backlash and diff bearing preload is a wonderful
thing! And the crush spacer is beefy, eliminating the occasional failed
spacer syndrome seen in #489 8-3/4" axles, while making pinion setup a snap."


On one of the Dodge truck forums about rebuilding the 9 1/4 rear:

"If you throw the pinion in the
freezer for a couple of hours you should be able to pull the inner
pinion bearings off with no problems! and if you put the new pinion
bearings on the stove for a couple min. it will fall right on your
pinion! and the best thing is you dont have to pay anyone to do it!"

This might be a good value:

http://smartflix.com/store/video/1356/Differential-Rebuilding (http://smartflix.com/store/video/1356/Differential-Rebuilding)


stitcherbob2010-03-22 22:32:27
Title: 9 1/4 rear: Running great!
Post by: Steve on March 22, 2010, 07:31:21 PM
I forgot about all that. . .That's not new though. . .  It's been a long time since I did a rear
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 23, 2010, 03:48:54 AM
Quote from: stitcherbob
E-berg said of the 9.25 rear...
Thank you, Robert, for being a day late and a dollar shy... (http://www.moparfins.com/forum/smileys/smiley2.gif) 
Title: 9 1/4 rear: Running great!
Post by: Stitcherbob on March 23, 2010, 05:48:37 AM

Quote from: Commando1
Quote from: stitcherbob
E-berg said of the 9.25 rear...
Thank you, Robert, for being a day late and a dollar shy... (http://www.moparfins.com/forum/smileys/smiley2.gif) 

Sorry...I tend to ignore yer posts....too many about stripper taxi cabs with emanual trans's(http://www.moparfins.com/forum/smileys/smiley2.gif)

Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 23, 2010, 12:21:38 PM
Well, I'll have you know I got great news today.  The rear end guru had to reshim the pinion and I was good to go.  Other than that, he said my work was excellent! 
I'm so giddy with happiness right now trhat I have to do the Stanley Dance...

 
(http://www.moparhemi.com/Gallery/TheStanleyDance.gif)
Title: 9 1/4 rear: Running great!
Post by: Stewart Van Petten on March 23, 2010, 01:04:02 PM
I bet the lower rear gears really woke that car up! Good to hear you are rolling again!
Title: 9 1/4 rear: Running great!
Post by: Stitcherbob on March 23, 2010, 03:13:18 PM

Well, I'll have you know I got great news today.

I'm so giddy with happiness right now![/QUOTE]

(http://images.tvrage.com/shows/6/5916.jpg)

great nooz Stan!

Title: 9 1/4 rear: Running great!
Post by: Guests on March 24, 2010, 04:05:20 PM
See, you didn't mess anything up too bad, and a lack of a shim is not that big a deal. Trial and error is on the list of requirements of rebuilding each and every single rear end, so no harm, no fowl, the teeth were just meshing a little bit too far out on the ring gear, so not too bad.
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 25, 2010, 03:56:32 AM
What a difference the 3.55's have made.
Gas mileage aside, I'm now ready to go shock some RoadRunner owners....
Title: 9 1/4 rear: Running great!
Post by: Stitcherbob on March 25, 2010, 05:14:21 AM
then ya shoulda done 4:11's  (http://www.moparfins.com/forum/smileys/smiley2.gif)

Title: 9 1/4 rear: Running great!
Post by: Stewart Van Petten on March 25, 2010, 06:39:28 AM
My dad had a 74 Fury III that he special ordered with a BB and low rear gears for towing. Heand my mom picked it up at the Windsor plant as it came off of the line. Anyway, I recall racing some "fast" cars with it in highschool and it ate up many of them in the 1/4 mile. You should have heard the lame excuses my buddys came up with when they lost to the big family car! Big block B Body+low gears=traction+good acceleration. I miss that car!
 
Good luck with your new toy! Let us know if you take any hot rods down! lol
Title: 9 1/4 rear: Running great!
Post by: Ken on March 26, 2010, 02:40:09 PM
I knew you could do it, Stan.  Never doubted for a second.  Nice to get some positive feedback from the pro, too.  Now drive the wheels offa that car!(http://www.moparfins.com/forum/smileys/smiley9.gif)

Title: 9 1/4 rear: Running great!
Post by: Steve on March 26, 2010, 04:54:26 PM
(http://www.moparfins.com/forum/smileys/smiley4.gif) (http://www.moparfins.com/forum/smileys/smiley4.gif) (http://www.moparfins.com/forum/smileys/smiley4.gif)
 
I'll bet you thought I was going to say something. . . .
Title: 9 1/4 rear: Running great!
Post by: Stan Paralikis on March 27, 2010, 02:57:42 AM
Quote from: POLARACO
 
Not for one second...(http://www.massmopar.com/yabb/Smilies/baseballbatr.gif)
Title: 9 1/4 rear: Running great!
Post by: Guests on April 15, 2010, 07:32:10 PM
Good to hear.