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Went to order new front diff axle seals for my 2004 Silverado 1500 4x4... GM part#15801507...This part has been replaced by GM the new number is 22761722. I heard that you should "NOT use 22761722 on 2006 and older models. It will seep and leak....use old style 15801507" I did a search and...

Well bought new/used '04 Silverado 4X4 with a manual transfer case. Truck has just over 75,000 miles on it....I want to change fluids in both diffs and transfer case...I was told ....SAE 75W-90==>> rear diff ....SAE 80W-90==>> front diff ....DEXRON-III ==>> transfer Seems strange.....is this...