Rear differential shim -
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Unread 05-07-2014, 09:10 PM   #1
Registered User
1998 TJ Wrangler 
Join Date: May 2014
Location: Troy, NY
Posts: 1
Rear differential shim

How to I check to make sure I shim the rear differential properly?/ Does anyone have or know of a manual or guide to do it properly?

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Unread 05-07-2014, 10:30 PM   #2
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willis36's Avatar
1997 TJ Wrangler 
Join Date: Nov 2010
Location: broken arrow, oklahoma
Posts: 1,116
Don't take this the wrong way, but if you are having to ask this question, you might want to take it to a driveline or 4x4 shop. What are you trying to do?
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Unread 05-08-2014, 02:31 AM   #3
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FarmerinVA's Avatar
1999 TJ Wrangler 
Join Date: Oct 2010
Location: Tappahannock, Virginia
Posts: 608
Check out my install thread (you'll see it in my signature if you view this on a real computer). You need some specialized tools including a dial caliper, plus you need to know some specs. The FSM tells you most of what you need to know. A novice can do it but it will be slow going.
My do-it-yourself install thread for a TrueTrac in the rear, upgraded shafts, and a PowerTrax No-Slip in the front:
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Unread 05-08-2014, 08:22 AM   #4
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biffgnar's Avatar
2006 TJ Wrangler 
Join Date: May 2008
Location: Westchester, NY
Posts: 16,395
Are you talking about shims inside the diff when doing gear setup? In which case, the answers you have already are fair. Or are you thinking shimming of the axle to properly orient the pinion? If that is what you are thinking, you don't have leaf springs. With a coil sprung vehicle you need adjustable control arms to set the pinion angle.
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