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Old 02-07-2020, 12:15 AM   #20 (permalink)
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Originally Posted by Babin Farms View Post
2 qts of Genuine GM Fluid 88900402 Auto Trak II Transfer Case Fluid

Do NOT use the auto trac II fluid.
That is for the 1500 series with the auto 4wd button, those cases have clutches inside where the 2500 does NOT.

And this reminds me, I need to change the fluid in my case.....

I have been using 5w-30 synthetic motor oil with some PTFE additive in mine since 2006, it runs quieter, and besides, it is nothing but chain and gears in the case....

2003 Crewcab 4X4 with the EGR Valve (Blocked), Killed the Cat, and straight piped the muffler, boost and EGT Gauges, Merchant Automotive T-case pump upgrade installed, Curb Feelers, Fuzzy Dice, and Billet Grill. This truck is like a sore pecker, I just can't beat it!
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Last edited by Tolliwacker; 02-07-2020 at 12:19 AM.
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