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Which rear ends do I have?

Printed From: TheAMCForum.com
Category: The Garage
Forum Name: Transmission & Drivetrain
Forum Description: If it's between the engine and wheels, it goes here
URL: https://theamcforum.com/forum/forum_posts.asp?TID=32875
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Topic: Which rear ends do I have?
Posted By: AMSeeya
Subject: Which rear ends do I have?
Date Posted: Sep/22/2011 at 7:53pm
What did '68 Javelins come with? Model 20? Same question for 88 Eagles. You can probably see where I'm going with this, my Eagle has a beefy rear in it (assuming stock but locked) and my Javelin has a crappy one legger. Possible to switch?



Replies:
Posted By: poormansMACHINE
Date Posted: Sep/22/2011 at 7:55pm
Eagle is a 15.
Jav could be a 15 if originally a 6 cylinder car.
Eagle is wider and mounts beneath the springs.


Posted By: billd
Date Posted: Sep/22/2011 at 9:56pm
Eagle is definitely a 15 IF stock, and it's never a locking or twin grip differential. All eagles came with open differentials. They are a pretty light unit.
If yours is "locked" then it's broken, or someone has swapped - and I hope they kept same ratio in rear as front or kiss the t-case by-by.
Yeah, like the man said - pads will be different as Eagle differentials are under the springs for added height, Javelin diff mounts OVER the springs to keep the car low.


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Posted By: carnuck
Date Posted: Sep/22/2011 at 11:01pm
'80 SX4 had twingrip 2.35 ratio as an option I've been told.

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Posted By: AMSeeya
Date Posted: Sep/22/2011 at 11:36pm
The diff definitely isn't broken, and it also definitely isn't open. Lockers are pretty common offroading accessories... 


Posted By: billd
Date Posted: Sep/23/2011 at 6:37am
There was no SX/4 in 1980, and no sedan. Just the wagon. SX/4 is a 1981, 82 and 83 car only. The TSM states only open diffs (at least my copies)
The locker might be an off-road accessory, but they aren't stock AMC issue, so all I was saying is that it's not a stock AMC differential as it came from the factory. Someone has changed things. And if it's Eagle, it's a 15 and not a 20. Again, if you have one with a 20, it's not an eagle differential.
Pmm and I have owned a few Eagles over the years......... multiple SX/4s and wagons for me, not sure for pmm, SX/4s from what I gather.


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Posted By: AMSeeya
Date Posted: Sep/23/2011 at 7:04am
Thanks for the info Billd.. was a longshot anyway, thought I might get lucky and actually find a use for that darn Eagle sitting in my yard (where it's been for a year now). 


Posted By: purple72Gremlin
Date Posted: Sep/23/2011 at 8:04am
Think PMM had a wagon too..


Posted By: carnuck
Date Posted: Sep/23/2011 at 10:25am
Had to look at the paperwork from my old SX4 again. Bought in '80 but '81 model year. Definitely no Model 20 in them, but later models actually had the 2 piece axles still AND had D35C cast into the diff housing.
   My '81 Wagon is getting an 8.25 from an XJ swapped in (3.08 gears, slightly stronger and CHEAP! $35 from a Jeep guy swapping to better ratio)
   I found a D44 I have in my collection of parts (from a '66 Travelall 2wd) is the same width, same bolt pattern as XJ but it has 2 piece axles too!


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Posted By: poormansMACHINE
Date Posted: Sep/23/2011 at 3:56pm
Originally posted by billd billd wrote:


Pmm and I have owned a few Eagles over the years......... multiple SX/4s and wagons for me, not sure for pmm, SX/4s from what I gather.

1-sport wagon
1- Limited wagon
4-SX/4's


Posted By: AMSeeya
Date Posted: Sep/24/2011 at 12:54am
Well, here's my next question then. What's the cheapest limited slip/posi rear I can swap into the Javelin?


Posted By: Peter Marano
Date Posted: Sep/24/2011 at 9:17pm
1980 Eagle sedans two doors and four doors as well as wagons.



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