Recommended Fluids - Transfer Case, Front Diff, Rear Diff Going with Felpro gasket and permatex black gasket maker combo Confirmed 10 bolt diff Using 3 qts of valvoline 75w 90 for rear diff, 2 quarts for front diff, 2 quarts of tranny fluid for transfer case
Change both diffs oil and transfer case fluid early on - Tahoe Yukon Forum Just sharing my experience with everyone 2015 Yukon Denali with 39k miles I changed the gear oil in both differentials and the transfer case fluid today Used Amsoil Severe Gear 75w-90 and their Synthetic ATF, which is compatible with Dexron VI I wish I had done this at 5k or 10k