MoparFins

Techical Discussions => General Tech => Topic started by: Jason Goldsack on April 30, 2012, 03:41:28 AM

Title: Gonna do it.
Post by: Jason Goldsack on April 30, 2012, 03:41:28 AM
I have been talking with my mopar buddies and I think Eileen is gonna get a 360 magnum conversion with overdrive tranny. The wrecking yards are full of these and these truck rotted off the face of the planet so finding a donor shouldn't be that hard.

Now I have been also thinking about swapping the 8 3/4 for the truck rear too. That would get me the 3.55 gear. I haven't measured but it really can't be that far off since the 65 is pretty wide. I'm gonna measure the rear in my 98 and see how close we are. What is the measurement on the C-body 8 3/4?

I suppose I HAVE to use the truck computer in order to properly run the tranny right?

Any idea on a header to use.. maybe a Dakota shortie header?





Title: Gonna do it.
Post by: Guests on April 30, 2012, 05:40:20 AM
Sounds right on everything except the rear end. The usual swap is the other way around, the 8.75 swaps go into the Dakota trucks because the ones in the Dakotas are 8.25 (I think), but either way weaker than the 8.75. Now, if it happens to be a dana 60 rear, yeah, truck rear end, but bolt pattern is then the only issue. And yes, if doing a complete Magnum swap, the computer to run everything is best, but there are some easy kits from the trans shop companies that can help out with the quick trans wiring without the computer, not much more than a switch and a cable if not mistaken, they do it all the time with the big block swaps.
Title: Gonna do it.
Post by: Jason Goldsack on April 30, 2012, 06:03:55 AM


Ya.. but.... if they last in a Truck.. it should last in a cruising C-body. This is not a drag car.

I forgot about the bolt pattern change.. oops.... that won't work... :(



1965Windsor3612012-04-30 11:06:21
Title: Gonna do it.
Post by: Steve on April 30, 2012, 06:06:11 AM


I have a 355 sure grip rear here using that canadian gear posi.  But it was never set up right.  Howels  Wanna buy it and have it adjusted?   We can do the smuggle routine with WeeBee.  Polaraco is 323.   And getting 20 MPG
Title: Gonna do it.
Post by: Jason Goldsack on April 30, 2012, 06:13:02 AM
pm with a price.. I'll have to ask the boss.. LOL

The 361 gets 16.. and when it comes out it will probably end up in my step dad's 1970 Pickup...

I was gonna ask about cats. The computer looks for them... will I need to install them on the 65 for the computer to calculate the mixture right?



Title: Gonna do it.
Post by: Steve on April 30, 2012, 06:19:27 AM


Not sure on the ODP2. . .  I have the cats.  It seems to need that extra back pressure to run right
Title: Gonna do it.
Post by: Jason Goldsack on April 30, 2012, 06:23:15 AM
I was thinking about that... so you are not running headers?







Title: Gonna do it.
Post by: Guests on April 30, 2012, 06:35:11 AM
You really don't need the headers. These engines are set up to use back pressure to slow down the exhaust to cool it to keep the fuel/air ratios optimal, catcons aren't as bad as they used to be and for a full system setup, I would still use them if they are good.
Title: Gonna do it.
Post by: Jason Goldsack on April 30, 2012, 06:38:25 AM
I thought back pressure was evil... 


Title: Gonna do it.
Post by: Guests on April 30, 2012, 07:18:17 AM
Somehow they figured out how to us a certain amount of it to cool the exhaust and make the engines last longer and reduce the engine gas temps. Now, that doesn't mean it is more efficient or anything like that, but it does mean the engine puts out less caustic gasses, and allows them to run leaner, which equates to less fuel used to accomplish the same job.
Title: Gonna do it.
Post by: Steve on April 30, 2012, 06:32:36 PM


Been here!  Done This.  Piece-O-Cake
Title: Gonna do it.
Post by: Jason Goldsack on May 01, 2012, 02:40:09 AM
This is not looking like to easy of a swap...(http://www.moparfins.com/forum/smileys/smiley8.gif)




Title: Gonna do it.
Post by: Guests on May 01, 2012, 05:54:50 AM
It's not that bad, just have to get everything moved.
Title: Gonna do it.
Post by: Jason Goldsack on May 01, 2012, 06:15:21 AM
Maybe it would be easier to get a megasquirt  (http://www.megasquirt.info/)ECU to control the EFI and find a non computer control overdrive tranny...

I want to have a brand new driveshaft made.. the one I have looks too pitted to be shortened..





Title: Gonna do it.
Post by: Guests on May 01, 2012, 06:45:21 AM
Check with some of the different aftermarket transmission companies (TransGo, etc.), and you will find the setup for the transmission. Remember, the 4spd overdrive transmission was a biggie to go behind the big blocks with an adapter, ministarter and a simple button to engage the overdrive, and kickdown cable. If you want to spend the money on Megasquirt, go ahead, it is your money, not mine.
Title: Gonna do it.
Post by: Steve on May 01, 2012, 07:03:09 AM


They are supposed to have a multi-port setup too
Title: Gonna do it.
Post by: firedome on May 01, 2012, 07:05:10 AM


My son is doing a MegaSquirt conversion on his MGB-GT race car, he's very impressed with it's

power potential and adaptability.



Question for any small block experts (not me that's for sure) - I'm
told that over the years post ~1980 that the castings became
lighter/thinner, heads changed, cams, intake etc... so are these
changes anything to care about? Were earlier 318/360s better or more
desirable?  Would Jason be better off with an older one with
upgrades to better carbs, or multi carbs, injection, cam, exhaust ie
the traditonal ways of geting more power, as opposed to a Magnum
transplant? In some ways it might be easier. Just wondering.


firedome2012-05-01 12:07:27
Title: Gonna do it.
Post by: Jason Goldsack on May 01, 2012, 07:10:55 AM
I would have to make a drivers side motor mount since I have the goofy 65 only K-member.. Not hard to do.. just takes time..

BTW.. I'm almost done my mower racer for this year. #43 with a retro Petty STP Charger paint scheme.. :D



Title: Gonna do it.
Post by: Steve on May 01, 2012, 07:14:25 AM


Stroke a 318 to 400.
Title: Gonna do it.
Post by: Jason Goldsack on May 01, 2012, 09:11:45 AM
If I was to use the early castings I would put on Magnum heads they are a bolt on. The best would be to find a roller motor from the late 80's and swap magnum heads onto it. Then I would be able to use a much more aggressive cam.


Title: Gonna do it.
Post by: Guests on May 01, 2012, 11:45:19 AM
Yes, yes, you could. Not sure if it is just the Magnum engine/heads, or whether it corrects itself with the roller cam, but Magnum heads on an LA engine require the pushrod holes to be drilled out larger because the lifters are spaced differently, but it is doable, just be aware it may be part of an issue to deal with and not a surprise.
Title: Gonna do it.
Post by: Jason Goldsack on May 01, 2012, 11:51:06 AM
From what I have read the magnum to non-magnum is a true bolt on.. the other way around requires modifications to the oiling of the head.


Title: Gonna do it.
Post by: Guests on May 01, 2012, 12:08:39 PM
Magnum to LA requires AMC V8 lifters and hollow pushrods to oil the rockers. Sorry, forgot about that. Not sure why you would want to put LA heads on a Magnum, unless they were W2 heads and intake, but you would still have to do the lifters and pushrods, along with W2 heads, intake, and rocker set. I think the W2/LA valve covers are the same.