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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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| | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | 37 1/2 ton would have came with a 3 speed transmission. Does the shift lever have a small rod on the left side that goes to a metal lever that you lift up on to put it in reverse? If it does its a pre 48 big truck 4 speed transmission. I think that 46 was the first Chevrolet light truck to have a 4 speed transmission. | | |
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