I have a much simple way of mesuring driveshaft length .First make sure the car is level then install the slip yoke in the trans pull it out 1 and 1/4 inch and measure the length from center to center where the u joint sits front to rear that will give you the correct length i have used this method for many years without any issues
Wish this came out 6YRS. AGO. DAM IT.!!!!!
I have a much simple way of mesuring driveshaft length .First make sure the car is level then install the slip yoke in the trans pull it out 1 and 1/4 inch and measure the length from center to center where the u joint sits front to rear that will give you the correct length i have used this method for many years without any issues