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Click on image for the lowdown. 
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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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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: Oct 2013 Posts: 331 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 331 | There isn't one. It's just a GM 4-speed, used from '31 to '47 in trucks and school buses only I believe. It's a non-sychronized crash box with straight cut gears. It was the predecessor to the SM420. Here's a link to a drawing of it: http://chevy.oldcarmanualproject.com/parts/1929_54/221.htmShould have casting number "GM 590474" on the left side of the case.
1950 4100 - unrestored and driven weekly for almost no reason at all.
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