Tire pressure is going to rely completely on the weight you have on the truck and what you're using it for.
I have had great results with chalk and a concrete pad. Inflate/deflate each tire until you get a full and even contact patch on the ground.
My first '95 Powerstroke with 49" tires took about 15 PSI in the rear and 22 PSI in the front.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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