80/90 is fine in front and rear for general use.
If the rear diff is a limited slip then you need an LSD additive ... or a LSD oil.
If you're working the diffs hard offroad - or doing a lot of towing - you might want to step up to 75w/140 ... as per the factory specs for heavy duty use.
Grey RTV is fine on the diffs. but use the hi-temp stuff if thats what you have.
Gaskets are good if you can get 'em.
Make sure you clean ALL the old RTV off.
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