How far should the yoke be inserted into the tail shaft? 1968 coronet 440 motor, a833 4 speed, 8 3/4 rear 742 pumpkin. Drive shaft is 52" center to center on u joints plus yoke is 8" from center of u joint to end of yoke. The machined part of the yoke is 6" long and 2" is outside of the tail shaft housing (including dust boot) which leaves 4" inside the actual housing and as you know the yoke has no splines in the first inch so really that leaves 3 inches max on splines. My question...is the drive shaft measurements what they should be for a dodge b body 4 speed rb motor? I'm hoping this is the answer to a long battle with a vibration we been chasing for years. read all the past posts on vibrations, got it all covered, vibration is speed related excell or decell don't matter it's constant from 50mph on up. changed wheels and tires, tracked it down to drive shaft speed issue, covered all them bases, you know the routine....balance ds, pinion angle, clocking u joints, axle shafts, bla bla bla...just found out the guy i'm helping had his new drive shaft built using measurements from his old shaft so thinking he had a bent shaft had one built and balanced the same length which could have been too short from the very begining of this wild goose chase. The car was bought as a roller many years ago and is nowhere near any original drivetrain. Anybody out there have a vibration from too short of a drive shaft?