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Anyone happen to know the part number for the rear diff. gasket. Tis the 14 bolt unit.:help:
 

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Well....I was wondering the same thing. When I did my rear axle service I was told that GM no longer uses rear axle gaskets! I went to a couple of more parts stores with no additional information. But to my suprise, when I performed the service there was a factory gasket in place! Go figure.:D
 

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I replaced the rear axle gasket 01/26/02 on my 2002 D/A with the 14 bolt, 11.5" AAM rear end. At that time, the GM # was 12471447.
I think I had to take bad the first gasket they gave me, which was the wrong one. Part #'s at GM seem to change from time to time.
 

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I just use some good 'ol RTV sealant, like UltraCopper. Make sure to get any left-over residue off both the cover and diff, put a small bead on the cover and button the thing up. The best results are achieved if you let the RTV 'set-up' for +/- 24 hrs before adding the lube. This has worked for me for many years. Cheers.
 

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:exactly: I did mine with RTV and let it sit for about two hours in a unheated/uninsulated shop, temp. inside was in the high 20's and it still sealed up tight with no leaks to date.
 

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I use the gasket, but Untra Blue both sides of it. Removal is very easy with no scrapping.
 

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Mag-hytec uses a o-ring. Will never leak. Even if you remove the cover and reinstall it.
 

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RTV it all the way around let it set for a few min and bolt the cover back on that is what my dad and i have done for years
 

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i just got a gasket the other day at autozone, only a few dollars, just give them the model of your truck and they look it up that way.
-Paul
 

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had mine replaced twice while under warranty, when it happened after the warranty expired I used some good ol' rtv, haven't had an issue since
 
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