If you've seen my project journal on the '72 Kammback, you know I need a custom length driveshaft. I'm familiar with the lengths posted in the FAQ, but it appears those lengths won't work with the 215 V8, custom trans crossmember, T50 and the 7.5" rear.
So, how much of the slip yoke goes into the trans?
One thought says 1/2 of it, allowing equal amounts of in/out travel with suspension travel.
But another thought is 1/2 travel out would be catastrophic..... maybe more spline engagement is used (IN) and the travel in/out is less than 1/2 the slip yoke length.
Then I'm thinking at full droop (on lift), at least 1" of spline should be minimum. To be safe. Would that allow ample inward movement?
Is there a standard rule?
Just figured I'd run it by you board members before heading to a driveshaft shop that may not be familiar with the suspension movements/travel of an old H-body.