727 Question

fishy68 said

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.

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Now think about that....if your using an incorrect slip-yoke (to short), that simply means that yoke is not on as much spline on the tailshaft. Buy using a slightly longer drive shaft, ( like your suggesting) to try and compensate, is not the proper way to correct this, as your making the yoke closer to the end of the tail shaft and can actually bottom out with suspension travel causing damage. I'v seen this happen. You should always use the correct specified drive shaft length for the car, and the correct length slip yoke.