How do I tell what kind of front diff my truck has , I would some sort of posi or locker in the front on the cheap(without welding it together), any suggestions????????????

VIN check for the RPO codes would probably tell ya. If it is the one in your signature it would most likely have an 8.25"

http://dieselplace.com/forum/showthread.php?t=194446

so would I have an 8.5 or a 9.25???

8.25"