I have a 98 XLT 3 door 4x4 with the 4.6L, 3.55 w/LSD currently I am running 315/70/17's BFG A/T KO's on the stock rims. I do not do any towing and carry moderate loads in the bed occasionally (350-400lbs adv.) with my old 98 Jeep Wrangler with 35X12.5 BFG A/T KO's i ran the pressure at about 28-30 and that was perfect. I know the truck weighs much more than a Jeep so what pressure is good? a buddy of mine runs at 50psi (same tires same truck) I think that is way to high. what do you think?

 

Call BFG customer support line. They will tell you their recommended pressure for your set up. I have 285/70/17 TA/KO'S on my 05 screw. I called BFG and they gave me 43 psi for just vehicle and passengers. I have 48,000+ on them.

 

According to the specs on the BFG site, those are a LR D with a max of 50 psi. Yes 50 would be too high. I would run them around 38 - 40. That should handle anything you are using your truck for. If the tires on your truck are a different load range or max pressure, post back what they are.

 

take a look at this article
http://www.fourwheeler.com/techartic...sure_pointers/

 

Ran my 315x70x17 BFG's at 42 to 44psi on my old '04 Lariat. They wore perfectly at that pressure. Load Range D 50 psi max.