BigBadJohn
Newbie
I looked in the garage and found the rear differential cover and gasket I had bought. Also with them was 2 gallons of 80w90 and the 3 quarts I had bought from the dealer were GM manual transmission/transfer case oil
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The transfer case is almost certainly going to need Dexron III or Autotrac II, depending on the year. My '97 K2500 transfer case takes Dex III (Dex-Merc in today's language.) I have a 2003 Trailblazer that needs Autotrak II.The GM dealer sold me the Manual Trans/Transfer case order number 88861800 rather than Autotrac II. I wonder why. Most things I’m reading are pointing towards the Autotrac
Wtf. I just called a local Chevrolet dealer and they told me that my front and rear differentials take roughly 2 quarts each 75w-90 but what's strange is he told me the rear needed slip additive. I asked him the order number for the GM additive and he gave me the number for this. I've seen several people online saying NOT to put additive in it and here a GM shop is telling me to put it in.
https://www.amazon.com/ACDelco-10-4...coding=UTF8&psc=1&refRID=3ER268P8Q189FE7R2BZ0
Also, the parts guy told me the transfer case takes 2.2 quarts of manual transmission fluid. This is a separate GM shop than the one that sold me the Manual trans fluid last year. I asked the guy about Autotrac II and he said that it's not the correct fluid for my TC