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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!
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| | | | Joined: Sep 2009 Posts: 5,837 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,837 | 79broncoowner,
The casting number "3743368" can be traced back to the "main case" casting code number for the Muncie SM-319 (3-speed w/overdrive) and the Muncie SM-318 (3-speed). Same case used for both versions of this 3-speed.
The other numbers you provided "could" be casting date code numbers, but don't match up with known casting code info I could find???
Ed hit the nail on the head - a picture (or 3) with all these details clearly visible will go a long way in helping you ID what you have.
Dan
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
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