Transfer case question: Manual vs Automatic - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hatzie** · 11-06-2018, 01:44 PM

If you have a big round AUTO button at the top of the 4x4 control buttons it's an Autotrak transfer case. That's the one that takes the blue GM Smurf Blood.

Floor Stick and three button electric shift "2, 4H, & 4L" only are manual cases. The GMT800 chassis trucks with these cases used Dexron III... AC Delco 10-4033 / GM 88861900.

**jocko** · 11-06-2018, 10:09 PM

Wasn’t the auto t-case (that drinks the smurf blood) only available in 1/2 tons?
As hatzie helped me get my arms around, since Dex III is no longer produced and certified, DEX VI is the authorized auto trans fluid and Man Trans and T-case fluid 88861800 is recommended in the TSB for the t-case.

**hatzie** · 11-06-2018, 11:41 PM

I believe they were available in the 3/4 ton SUVs too.
Probably not on the 3/4 ton pickups tho.

11-06-2018, 01:44 PM	#26
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Transfer case question: Manual vs Automatic If you have a big round AUTO button at the top of the 4x4 control buttons it's an Autotrak transfer case. That's the one that takes the blue GM Smurf Blood. Floor Stick and three button electric shift "2, 4H, & 4L" only are manual cases. The GMT800 chassis trucks with these cases used Dexron III... AC Delco 10-4033 / GM 88861900. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 11-06-2018 at 02:39 PM.

11-06-2018, 10:09 PM	#27
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,975	Re: Transfer case question: Manual vs Automatic Wasn’t the auto t-case (that drinks the smurf blood) only available in 1/2 tons? As hatzie helped me get my arms around, since Dex III is no longer produced and certified, DEX VI is the authorized auto trans fluid and Man Trans and T-case fluid 88861800 is recommended in the TSB for the t-case.

11-06-2018, 11:41 PM	#28
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Transfer case question: Manual vs Automatic I believe they were available in the 3/4 ton SUVs too. Probably not on the 3/4 ton pickups tho. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

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