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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | 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: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | 61 1/2 ton should have either 4.10 or 3.90 gears, iirc. Another factor is tire size, specifically the rolling radius, measured from pavement to the center of the wheel. You double that distance to get the tire diameter for the formulas. Cruising rpm for the stock 235 is 2,200 to 2,700 rpm. Above that for extended times and your rods start to stretch and fatigue. Here's one link to a calculator, there are a lot more out there. http://www.ring-pinion.com/calculators/calculatorsind.html
Fred
52 3600
69 C-10
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