MoparFins

Techical Discussions => Tech- - DRIVE TRAIN => Topic started by: Steve on September 01, 2009, 03:53:14 PM

Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 01, 2009, 03:53:14 PM
Hey Guys!!!!

As some of you will recall (those of you who followed the Saga of Uncle Hulka's 68 440 Sport Fury), I had an issue with my transmission (1971 vintage 727). Under anything but mild acceleration, the tranny would slip like CRAZY at the 1-2 and 2-3 shift points. I have to take my foot off the pedal to get into the next gear.

AAARRRRGGGGHHHHHHHHH! I don't know what the cause is. I checked the throttle/kickdown linkage and confirmed it's properly adjusted. I'd love suggestions, but that's not the reason for this post.

Anyway, I just scored a 1970 727 TF and torque converter out of a running/driving New Yorker with a 440. The 440 was pulled decades ago and the trans has been sitting (with fluid) in his garge under a blanket ever since.

My question is this: Am I correct in believing that this will bolt right in (after inspection and a TransGo shift Kit installation) and work with my existing driveshaft and torque converter?

Good to be back and thanks for all the help.!




Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 01, 2009, 03:57:12 PM
You betchya
 
Replace the front seal before you go any further.  May as well change the rear seal and the O-ring for the selector tower. (Requires removing the valve body)  That's where the selector lever comes through the trans case.  Flush out the valve body real good with some break clean.  Drain all the fluid and change the filter.  Adjust the bands. 
 
Let her rip
 
Make sure there isn't a bunch of big chunks in the pan
 
Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 01, 2009, 04:19:19 PM
Ah, Polaraco! Good to hear from you again, my friend. As always, you offer sage advice. I had planned to clean it up and I appreciate your specific suggestions.

I think I really lucked out finding this. I had called around to the local junkyard looking for a 727 for a big block. He laughed and said I'll have a better chance finding a hemi in a junkyard. I found this about 25 miles from home and got it for $75 with the torque converter. I thought that was a pretty good price.

Thanks again, Polaraco! Great to hear from you!


Title: Uncle Hulka asks "Will This Fit?"
Post by: Rich on September 01, 2009, 08:17:29 PM

Your shifting problems in the old trans are likely caused by a valve body leak where it attaches - the pressure can't keep up with the leak and bleeds down too fast. I had this trouble with an old Duster that had a 904. The trans repair shop dropped the valve body and replaced an O ring or two and a couple gaskets and away I went, $90 poorer but with great shifts.
krautmaster2009-09-02 01:19:44
Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 02, 2009, 02:39:01 PM
***** UPDATE *****

After work I found the numbers on the left side of the trans. They are as follows:

3681054  4305  9238
(I couldn't read the plant code at the begining)

So it looks like it was built on May 11th 1973 and was used in B and C Bodies with 400-2bbl engines.

Were these strong transmissions? It's not a 1970, but were '73's as good, better or worse than a 1970 (or 1968 for that matter).

A little bummed out.


Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 02, 2009, 05:21:44 PM
It's OK
 
Basically, a 727 is a 727.  Same trans was used from 57 to even modified into a 518.  They did evolve slightly since 57.  First it was a cast iron case, rear pump, went to aluminum in 62.  Then it went to the slide yoke in 65 w/ front pump only, and then the cable shift was eliminated in 66.  Then it was pretty much the same trans until 76 where they made some Valve Body changes.  The only different 727 I know of was the one used in the Motor homes and chassis back in the 70's.  They were slightly different inside with more clutch packs.  I've swapped parts around from 70's trans to a 62 and a 58 once.
 
I know in the late 70's, they played with the valve bodies to make them shift a bit smoother.  Other than that. . .Go for it.  Just do the proceedures we mentioned above and enjoy it. (http://www.moparfins.com/forum/smileys/smiley4.gif)
Title: Uncle Hulka asks "Will This Fit?"
Post by: Jacques on September 03, 2009, 11:41:24 AM
In addition to Steve's list: in 73 they added the part throttle kickdown, also a change in the valve body, and one of the nicest features you can have on a 727.

Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 03, 2009, 02:37:13 PM
OK, so I shouldn't be too bummed that it's not a 1970 transmission?

Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 03, 2009, 05:01:15 PM
Forgot that Lea.  Thanks
 
Unca?  Don't get paranoid on us now. . .
 
Go for it.  73 was a good trans.  Just do all the things we suggested before installing it and let her rip.
 
Oh by the way. . .
 
Get yourself one of those 518 pan gaskets.  The reusable kind.  The dealers have them.  You'll kiss us for it.  They don't leak!  Don't put anything on it, just put it on virgin
Title: Uncle Hulka asks "Will This Fit?"
Post by: Dan Cluley on September 03, 2009, 08:04:35 PM
Not actually important to Uncle Hulka, but if we are clarifying things, the '65 still has the rear pump  (not 100% positive, but I think it is the last year)
Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 04, 2009, 07:24:48 AM

I know I sound paranoid, but I'm not. I just had it stuck in my head that transmissions, like the engines we love, suffered serious performance losses after 1970. My faith is restored.

I'm going to rebuild the transmission. I'll get a good rebuild kit + the TransGo TF-2 shift kit. Should be a good learning experience.

As for my current trans. problem, I'm getting a pair of 300PSI gauges and I'm going to see what my trans. pressures are. Maybe I have some fluid by-pass in a critical area.

Of course, I'll keep you guys posted on progress and status along the way.

Just remember, if it wasn't for the support I found on this site, there's no way in Hell I'd be even thinking of trying this.

Thanks!

Uncle Hulka2009-09-05 08:55:01
Title: Uncle Hulka asks "Will This Fit?"
Post by: Jason Goldsack on September 11, 2009, 10:28:30 AM
While you have the valve body out, put in the 5.0 lever too in place of the 3.8 lever. You will thank me in the end..(http://www.moparfins.com/forum/smileys/smiley8.gif)

Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 13, 2009, 01:59:49 PM
I don't understand. What is this and what does this change?

Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 16, 2009, 02:20:37 PM
helloooooooo?

Title: Uncle Hulka asks "Will This Fit?"
Post by: Rich on September 16, 2009, 03:24:47 PM
It changes when the trans kicks down--happens sooner (it might also change the pressure?) These were installed in the Hemi transmissions.

Title: Uncle Hulka asks "Will This Fit?"
Post by: Steve on September 16, 2009, 03:48:40 PM
Quote from: D Cluley
Not actually important to Uncle Hulka, but if we are clarifying things, the '65 still has the rear pump  (not 100% positive, but I think it is the last year)
 
No Dan. . .   The pump was moved forward in 65 as well as the slide yoke.
Title: Uncle Hulka asks "Will This Fit?"
Post by: glen cyr on September 16, 2009, 05:50:46 PM
The 3.8 ,4.2 and 5.0 levers actuate the intermediate band,while the 4.2 and 5.0 speeds the actuation up! The 5.0 lever places 1 pound of force on the tip,while appling 5 lbs of force on the band! I've got a 5.0 lever in mine,and lots of trans experts say,the 4.2 is the way to go as they say the 5.0 grabs to harsh! I've used the 4.2 also and find no difference!
 
Glen