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, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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