Driveshaft: how much clearance?

jdsduster said

dennys,empire,ect,dont measure that way

with the suspenion loaded.they measure from the face of the yoke to the end of the output shaft.and also the depth of the spline.

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Plenty of ways to skin a cat for sure. I think if you have the yoke you want to use, measuring center to center of the u-joint is good. If you don't then the mail order places do the math for ya. Not a big deal either way.

In my cars, suspension loaded vs full droop is a difference of 1/8". So, not really enough to worry about with an inch of clearance built in.