Quote:
Originally Posted by hatzie
Yup... 2007 GMT800 and earlier Autotrac cases used Smurf blood the rest used Dexron III.
For Dexron III Transfer case oil See TSB 04-07-30-037E
Dexron III is no longer being tested. The AC Delco 10-4033 GM 88861800 replacement is less than $7/qt from Summit. Mobil Valvoline etc Dexron III compatibles usually cost more.
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Hatzie, interesting. TSB does direct use of Manual Trans Fluid in place of DEX III (in the t-case) - I never ever would have known that... But it also says to use Dexron IV in the trans if the trans was spec'ed to use Dexron III.
So, for a 2001 with NP1 (manual t-case) and Allison, i.e. yours truly, sounds like Manual Trans fluid in the t-case and Dex IV in the trans... (?) Since Dex III is still available at auto parts stores, I wonder how many folks are totally unaware. Or do you use Mobil or Valvoline Dexron III in the trans..? Hmmm.... VERY interesting! Btw, 88861800 also shows up as Manual Trans Fluid 75W90 (but at 8.99/qt - at Summit). Wonder how they could have the same PN.