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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: Jul 2014 Posts: 892 'Bolter | | 'Bolter Joined: Jul 2014 Posts: 892 | On open drive line trucks you can fit a factory overdrive 3-speed transmission or on heavier trucks find an auxiliary transmission out of a tandem-axle truck. A spicer 5831A comes to mind. That gives you 12 forward gears, of which 10 are useful. 6231As can also be used but it's overkill. I suspect that any of these are more prevalent than an overdrive unit for a closed drive line Chevrolet. You might consider converting to an open drive line.
1951 3800 1-ton"Earning its keep from the get-go"In the DITY Gallery1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971. | | |
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