Originally Posted by first48
...Will this do the job so I can run 65 mph without pushing the rpms...
A good gear calculator
http://www.onlineconversion.com/bigger_tires.htm

•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-