Quote (F150 @ Dec 6 2013 09:54am)
idk man, my 1974 F100 on 39s with a 5.9 BB gets better than 10 something is wrong there if you are only getting 10 and not beating the shit outta it you need to investigate wtf is going on
but im pretty sure 315/75/16 are 35s and a 305/75/16 is a 33
my old Z71 had 305s and they was 32.9 inches (close enough to be 33s IMO)
but you can take it to a shop to have it re-calibrated to the tire size
When did you put 39's on it?
Last I seen you didn't know how to change a u-joint