I had a 95 with 265/75/16 on it. They were BFGoodrich All-Terrain T/A. I ran 40 psi in all the tires and got almost 55,000 miles out of them. I would put 55 psi in the rear if I was towing anything heavy.
Do what the sticker in the door says, its probly 65.
More than likely that truck came out with 235/85/16 and has probably been switched to a different size. The tire placard on the door will not be correct if the tire size is different. If it is a 265/75/16, 40 PSI works perfect. Good mileage out of tires and no abnormal wear.
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