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Old 11-11-2006, 09:19 PM
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Changing rear diff fluid--gasket or no?

68 Chevy panel wagon w/12 bolt rear. I usually don't use gaskets when resealing diff cover, just gray rtv. This one had gasket in good shape with no sealer, and has slight bend at bottom. Mounting surface seems o.k. This diff cover is built a little different than what I'm used to (IH, Ford, and AMC), has an extra little lip.
What do ya'll use?

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Old 11-11-2006, 09:48 PM's Avatar
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In the good old days I used the gasket with sealer on one side. Now I use hi-temp Gray silicone RTV It is heavy bodied and won't leak.
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Old 11-12-2006, 12:18 AM
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I just don't like RTV. It's messy and it's hard to get rid of. I use a plain old gasket and paint it with Permatex #3 or Super 300 liquid. It seals just fine, and you can take the cover off any time you want without a fight. It cleans off easily with alcohol on a rag, and most times you could re-use the gasket if you wanted to.
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Old 11-12-2006, 10:08 PM
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I used to use Permatex Right Stuff. Best damn sealer I ever used. Now at the dealership, they won't buy it for me so I use orange MoPar axle RTV. Works okay, but the Right Stuff was better.
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Old 11-14-2006, 12:16 AM
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I use a gasket with a good coating of spray permatex gasket sealer. The only time I use no gasket is with a good-quality cast aluminum cover, but stamped steel covers just don't have the rigidity to hold sealant in place.
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