my 56 3/4 ton has a vibration when in 4th gear. my dad says he thinks the drive shaft has been turned or not replaced when removed to the correct in line status. he says the shafe has marker points to put it back in exactly as removed. I cant find marks like this on my truck. I did remove the 2 piece drive train during restoration.
any hints or pointers on removal of the shimmy or vibration? I have new balanced tires for what its worth.
