After complete restoration of my 69 SS Chevelle I ended up with a vibration at 65mph. Was told it was a driveshaft issue and decided to upgrade to 700 lb. torque 5 speed which came with it own custom driveshaft. Still vibrated. Then had the 12 bolt... ...read more
Here is a view of the inside of a transmission slip yoke with twisted splines. This is typical of the damage that can occur with heavy vehicles and manual transmissions.