has vibration during normal acceleration.at 40-60 mph

Vibration while under a load could be a bad U joint or an out of balance drive shaft, you will have to get under the truck and check for play or movement in the drive shaft, you should not be able to make it move if you attempt to twist it either way. Another way to check is to put he vehicle in drive then reverse, if you hear and feel a clunk your u joint is bad.