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Click on image for the lowdown. 
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| | | Forums66 Topics128,109 Posts1,056,271 Members48,439 | | 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!
| | THANKS!
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: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | IF you have a OD transmission, it's not a factory transmission. Chevrolet never put a OD trans in a 1957 big truck (only the 3100 & 3200 had a optional OD transmission). The 6000 Series Trucks were standard with the SM-420 4-speed with an optional New Process 5-speed (direct drive). This 5-speed has a shifting pattern that looks like this; 1...2...4...R ....3...5 Mike B  | | |
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