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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#21386 02/08/2002 10:38 PM | Joined: Jan 2002 Posts: 17 Apprentice | | Apprentice Joined: Jan 2002 Posts: 17 | I have a 56 GMC Army 6X6 with a 302 inline 6 and a Hydramatic 4 spd automatic transmisssion. The truck data plate calls for OE 10 oil below 32Deg. and OE 30 above 32 Deg. htese are basically Non- Detergent motor oils. Is there anyone out there that might know what the best oil would be now. There ahs been a lot of changes in oils since 56. Would the Transmission/ Hydralic oils used by Farm Tractors and Industrial equipment be the equivilent? This type oil is used in Allison Transmissions.
I have heard of people using Dexron III. I just wanted to know if any of you have a 50's GMC with this transmission and what you use.
This is my first dealings with this transmission.
Thanks for any help.
Kenneth L. Hollingsworth
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