Then a rear axle swap to gain faster gears. And the dual circuit brake system with a booster for the brakes would be the minimum to go faster and add some safety.

What does the truck weigh, and how big is the body?
Do you have enough power to go as fast as you want?

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-