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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: Nov 2014 Posts: 70 'Bolter | | 'Bolter Joined: Nov 2014 Posts: 70 | I believe original transmission would be the SM-318 and I have worked on some of the newer mid 60's versions of that transmission. I have 3 of them 1 has a drain plug but 2 do not. The fill plug is on the right side of the main housing and the correct fluid is 90W straight mineral oil. Tractor Supply sales the fluid in 2.5 half gallon jugs as Ford Tractor Fluid. There is at least 2 versions of why you don't want to use a GL-4 or 5 fluid in those transmissions. #1 is that the EP additives are too slick and will not allow the synchronizers to work correctly and # 2 is that the EP additives will damage the brass and/or bronze in the transmission. Am not sure if one or both of those are correct.
ESum
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