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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jun 2014 Posts: 35 'Bolter | | 'Bolter Joined: Jun 2014 Posts: 35 | Any recommendations for the transmission fluid in my 1937 truck transmission. It's a three speed. | | | | | Joined: Aug 2015 Posts: 23 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2015 Posts: 23 | In my 1940 shop Manual, it calls for S.A.E. 90, S.A.E. 80 for (extreme) lower winter temps........just a thought. I go with the 90 myself. | | | | | Joined: Jul 2007 Posts: 444 Shop Shark | | Shop Shark Joined: Jul 2007 Posts: 444 | Here's a GL 4 Gear Oil that is safe for older transmissions with BRONZE or BRASS internal parts. Be careful using a GL 5 Gear Oil , they can contain corrosive additives that can be harmful to BRONZE & BRASS internal parts. Photo @ Photobucket http://i669.photobucket.com/albums/...Oil/61lwV-0e4CL._SL1500__zps0wo2pbt9.jpg | | | | | Joined: Jul 2013 Posts: 863 Shop Shark | | Shop Shark Joined: Jul 2013 Posts: 863 | I use straight 90 weight mineral based gear oil that I got from NAPA. The brand is Superior Gear Lube, but any brand will work. I would stick with what the shop manual designates.
Tim
"Pay attention to the details! It ALWAYS pays off."
1949 Chevrolet 3100 Series 1/2 ton Pickup
1964 Chevrolet C10 (Ol' Yella) (SOLD)
1958 Chevrolet Biscayne 2 door (SOLD)
1970 VW Beetle
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Does anyone know why there a difference between the transmission gear oil specifications for 1937 and 1940? 1937 1940 Did the transmission change substantially, or did the quality of gear oil change, or did GM just decide that one grade for all temperatures was OK? | | |
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