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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: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | No problem switching to an SM420 4-speed with the torque-tube adapter on the back. Same length as the 3-speed. You would need the 4-speed forward u-joint yoke and the 3-speed rear u-joint yoke.
The speedometer drive and driven gears would most likely not give the correct speed. A ratio adapter can be obtained for about $100 or less.
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