Originally Posted by Grigg
...Figure speeds and RPM here http://www.onlineconversion.com/bigger_tires.htm

Decide what engine RPM you want at what cruising speed in high gear, then work backward deciding what tire size, transmission OD ratio (if any), and rear axle gear you need to make it happen.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-