Rear end questions

[Myasylum]

I have been noticing a lot of A Body rear ends for sale, but B body rear ends seem more rare.
I have found a lot of carriers but that is it.
I have an 8 1/4. Can I use a 8 3/4 carrier and swap the rest out?
What other rear ends would fit a 72 B body?
Thanks!

 

[Cranky]

I have been noticing a lot of A Body rear ends for sale, but B body rear ends seem more rare.
I have found a lot of carriers but that is it.
I have an 8 1/4. Can I use a 8 3/4 carrier and swap the rest out?
What other rear ends would fit a 72 B body?
Thanks!

A body 8 1/4's for sale? And no, nothing swaps between the 8 1/4 and 8 3/4 if that's what you are asking except for the backing plates iirc. Never did that. They are two totally different designs.

 

[#41]

There are some C-body 8-3/4 axles that will physically fit in your 72. They may be 1/2" wider or so but will work. You may have to install shims on the springs to get the pinion angle right - no big deal - otherwise bolt in. I can't remember the exact ones. Rear end widths are searchable on the web.

 

[33 IMP]

I would look for a later model b-body 9 1/4. Quite a bit stronger than your 8 1/4, fairly inexpensive compared to an 8 3/4, should be a bolt in. There won't be a lot of gear in it however. Probably high 2.something.
There are good hotrod parts available, but they aren't cheap (just like any other rearend).

 

[MoparLeo]

Here are some good links to save for future use.
Ways to ID different differentials, tech info, axle and housing dimensions etc...
http://www.moparts.org/Tech/Archive/axle/16.html
https://www.forebodiesonly.com/foru...ear_id_jpg_pagespeed_ic_mia0pwdtbi-jpg.16484/
https://www.onallcylinders.com/2016/02/19/axle-id-a-quick-guide-to-identifying-common-rear-axles/
http://www.waywardgarage.com/tech/rearaxlemopar.html

 

[Cranky]

I would look for a later model b-body 9 1/4. Quite a bit stronger than your 8 1/4, fairly inexpensive compared to an 8 3/4, should be a bolt in. There won't be a lot of gear in it however. Probably high 2.something.
There are good hotrod parts available, but they aren't cheap (just like any other rearend).

The 9 1/4 had 3.92's with a Trak Lok in my 2000 Durango. Not sure how wide it was but it didn't look any wider than most B bodies. Might be something worth looking into plus the spring perches are on the bottom.

 

[khryslerkid]

I would look for a later model b-body 9 1/4. Quite a bit stronger than your 8 1/4, fairly inexpensive compared to an 8 3/4, should be a bolt in. There won't be a lot of gear in it however. Probably high 2.something.
There are good hotrod parts available, but they aren't cheap (just like any other rearend).

https://www.hemmings.com/stories/article/chrysler-9-1-4-inch-differentials

They are known for bad pinion bearings and limited slip clutch clips breaking.

 

[gkent]

You'd want a "light duty" 9-1/4 with 3" axle tubes and 5 on 4-1/2" bolt circle. '70's B and C bodies. Possibly some Dakotas and Durangos but they switched to 6 lugs at some point in the 90's so make sure you check that..

 

[67_satellite]

I have been noticing a lot of A Body rear ends for sale, but B body rear ends seem more rare.
I have found a lot of carriers but that is it.
I have an 8 1/4. Can I use a 8 3/4 carrier and swap the rest out?
What other rear ends would fit a 72 B body?
Thanks!

You have a P.M.