Shimming M 20 pinion HELP - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 03-15-2004, 10:31 AM
Posts: n/a
Shimming M 20 pinion HELP

Swapping widetracks under my 78 cj. Changing rear R&P on amc 20 to 4.10 ratio. Have shimmed the larger bearing races on pinion to try to get end play adjusted. So far I cant get it in tolerance. Do I need to also shim the smaller bearing race on pinion?
Sponsored Links
post #2 of (permalink) Old 03-15-2004, 02:37 PM
Keyboard Implanted
mbalbritton's Avatar
Join Date: Mar 2002
Location: Winston-Salem, NC
Posts: 3,833
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Shimming M 20 pinion HELP

If I'm reading you right.. what you're needing to "shim" with there is the crush Sleeve. this should be replaced each time the axle is torn down. and you might want spares, cause if you crush it too much when setting the gears up on the AMC, you'll need a new one. but I'll tell you this much, you're gonna want air tools to crush it. it took quite a bit from my buddies big air gun to crush it and set the depth.

Many places sell it in the shim kit for the AMC, but the part that "shims" that you're looking for is called the Crush Sleeve. Looks like a big wedding band
mbalbritton is offline  
post #3 of (permalink) Old 03-15-2004, 07:32 PM
Keyboard Implanted
pontiac58's Avatar
Join Date: Jul 2000
Location: southern new jersey
Posts: 2,818
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Shimming M 20 pinion HELP

Amc 20's use a crush sleeve like was said. You only shim the pinion depth.

How do you start to crush the sleeve. A big pipe wrench over the yoke and a big one inch breaker bar. Stick the pipe wrench inbetween the frame and the leaf springs and start pulling. Never use a impact, it doesnt take much to over crush it.

pontiac58 is offline  
Sponsored Links
post #4 of (permalink) Old 03-16-2004, 05:40 AM
Jim_Lou's Avatar
Join Date: Dec 2001
Location: Belleville, Illinois
Posts: 11,502
Thanks: 15
Thanked 22 Times in 17 Posts
Re: Shimming M 20 pinion HELP

A buddy hangs out on a bulletin board that discusses old British sportscars. He sent me the following:

This is the answer to someones question about too much freeplay in a replacement differential they bought.

"if it is out and sat on the deck stick it in the boot of the tin top and go to a transmission place who seem okay and get them to twiddle"
Jim_Lou is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome