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post #1 of (permalink) Old 03-15-2004, 09:31 AM
jeephoss
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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?
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post #2 of (permalink) Old 03-15-2004, 01:37 PM
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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
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post #3 of (permalink) Old 03-15-2004, 06:32 PM
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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.

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post #4 of (permalink) Old 03-16-2004, 04:40 AM
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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"
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