ok i got the timing fixed, and took the rear drive shaft out. for some odd reason the shaft was hitting the u joint brackets, where the ujoint meets the t case. ok so i am driving and the truck jerks and makes a loud clunking noise, consistent with acceleration, it does this wether turning or not forwards and in reverse, however it is worse when turning and accelerating at the same time, i am tired of shot gunning this due to the expense, i have checked the following, all ujoints appear to be good and in working order, all steering components look good and are solid, have new wheel bearings, on both sides, driveshaft is at proper lenght, and balanced,(front shaft), everything that has a grease fitting has been greased including the hub assybly, breaks all seem to be in order and are all new, so if anyone has any suggestions please through them at me, ohh yes i am going to take my diff cover off and look at the insides what should i look for and how much play should i have in the gears and such?