You can answer that question yourself with this
http://www.drivetraindirect.com/t_gear_calculator.htm
And the knowledge of how you want to drive and use your truck considering the capabilities of the engine and at what RPM.

First know what your choices are as far as gears and transmission ratios, then guess and check with the calculator till you find a combo that suits.

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-