well im not sure if these are the stock tires or not, but since all the stickers on the door are gone and the owners manual isnt there i was wondering what would be the best pressure to run in my tires

 

They are not stock for your truck it came with 235/75 15r or may be 31/10.00 15 All tires are different the 265/75/15 6 ply tires on my 94 wear best at 40 Lbs . Yours may wear better with more or less . Start with amount stated on sides of tires and go from there. What may wear best for you may not be the ride you want . Most people I know run 30-35 LBs in the 235/75/15 and 265/75/15 Hope I helped some . Good luck

 

well the side says 35 psi max on standard load, so i just went ahead and put 32 psi in, i didnt know because i just bought this truck and the guy drove it to my house on a lil under 24 psi in the tires

 

P265/75R-15 could very well be the stock size on that truck. Ford used a lot of those on F-150's and Bronco's. Just look at your door placard on the doorjam and it will tell you what size tire your rig came with and the recommended air pressure. Probably going to be 35 PSI.