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Old 11-24-2009, 09:05 PM
GGR GGR is offline
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Join Date: Nov 2008
Posts: 1,068
6.3 LSD: how do I know if the discs are good?

Hi all,

I got a second 6.3 rear diff and I want to make ome good one out of the two. I noted one has got bad bearings and the other one has some play in the diff casing pin. I took the first one apart completely and I would like to know how I know if the LSD discs are good or not. Some have heat marks. Is there a way to measure their thickness? What should it be? What are the tolerances? This info is nowhere in the w/shop manual.

Thanks in advance!

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Old 11-24-2009, 09:23 PM
have mercy's Avatar
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Join Date: Dec 2007
Location: Hedgesville WV
Posts: 200
Plastic gauge [they sell it at machine shops]. That's will check gap/alignment.
30 yr's still in love
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Old 11-28-2009, 04:43 PM
Join Date: Sep 2005
Posts: 664
The only info I have on this would be for the 600, but the real axles are pretty much the same on both.

The thickness that matters is the thickness of the 'sintered' material on the discs. If the sintered material is worn away the discs must be replaced.

Also, keep the discs in order. The order in which they are loaded into the axle is very important as the sintered material must match up in a specific way.

If you are going to get serious about owning a 6.3 a better source of info would be as that is where the M-100 owners are. This site cost $50 a year to belong to, but you also get a newletter and a few other benifits as it is not just a web-site but is the web-site for the M-100 Club.

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