Nope, there are really no readily available choices on faster rear axle gears for your truck.

Chances are you have the stock 4.57:1 R&P.

If you search you can find some 4.11 gears from a slightly later model axle, someone will be along with the details shortly.

Then theoretically there are some 3.90 or so gears out there to fit your axle, but I have talked to many people who have been actively searching for these elusive gears, and not one of them have found any.

The simple solution is probably an OD transmission and or a later model rear axle.

This site will be a big help with figuring gears and speed: http://www.onlineconversion.com/bigger_tires.htm

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-