727 Question

fanofpetty said
The proper drive shaft length for a duster with a 727 and an 8 3/4 rear would be 45 inches center to center of the u-joints.

That can actually vary a little bit depending on the slip yoke used. Some slip yokes slip farther into the trans. than others and some are pretty shallow. That's why you always need to measure it with the slip yoke your using.