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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: Apr 2005 Posts: 2,097 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,097 | I have a standard 3 speed and two 3 speed overdrives with the casting number 8845122. On yours the 6 could be a 5. In which case you have a SM318 GM trans with a BW R-10 overdrive. They have a 4 bolt side cover and a non syncro first gear. This trans was used from 55 through 65. There are some minor differences between cars and trucks. On the trucks the lower mount holes are threaded. There are also some differences on the side cover and the shift arms. There should be a date code below the casting number. Something like B 15 7 which would be Feb 15 1957.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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