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Click on image for the lowdown. 
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| | | Forums66 Topics128,052 Posts1,055,727 Members48,426 | | 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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: May 2015 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: May 2015 Posts: 47 | Hello all, I am new to the game, recently picked up a 54 3100 project - GREAT FORUM!!
I need some help with my transmission numbers decode
Main Case casting: 3686832 G Stamped serial number: G0I93I64 could also be G01931b4???
I've narrowed the casting to 48-54 all w/3 spd exc FK/FJ, but the SN is baffling me | | | | | Joined: May 2015 Posts: 8 'Bolter | | 'Bolter Joined: May 2015 Posts: 8 | following the pattern of earlier transmission serial numbers, the first letter is the year and the second the assembly plant. so I think G would indicate 49 and the O indicates Muncie Indiana check the 49 GM truck manual at https://www.gmheritagecenter.com/docs/gm-heritage-archive/vehicle-information-kits/Chevrolet-Trucks/1949-Chevrolet-Truck.pdf | | |
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