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Mod | | | Forums66 Topics128,014 Posts1,055,332 Members48,419 | | Most Online14,466
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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#21387 02/08/2002 11:15 PM | Joined: Jul 2000 Posts: 504 Member | | Member Joined: Jul 2000 Posts: 504 | I use Dexron III in my Hydramatic..
Bill M
53 GMC Hydra-Matic
Home Page
http://home.comcast.net/~bd97/index.html
When you argue with a fool, two fools are arguing..
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#21388 02/09/2002 1:04 AM | Joined: Apr 2001 Posts: 39 Shop Shark | | Shop Shark Joined: Apr 2001 Posts: 39 | i also use dextron in my hydromatic .i may need a tourqe converter for mine if you know where one is .it quit pulling and the people here tell me the converter is bad .it will try to move if you give it gas .any suggestions :confused:
47 Chevy COE..52 TO 30
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#21389 02/10/2002 3:00 AM | Joined: Aug 2000 Posts: 197 Member | | Member Joined: Aug 2000 Posts: 197 | If you need a torque convertor (I think it's really just a fluid coupling), contact Boyce Equipment or Memphis Equipment. You'll have to search for the numbers. Memphis Equip also sells a REB kit which is something like a shift kit which is supposed to substancially improve tranny life. These trannys have a poor reputation and lots of em got replaced with clark five speeds.
jason
Jason
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