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Message text written by John Beckett
"Keeping the transmissions and the pinion parallel to each
other.
Your adjustable suspension may need some geometry checks.
John Beckett
"
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John is correct on this. The angles must be the same on both the trans
output shaft and the pinion shaft. The u-joints will split the difference
for you. In over 30 years of replace u joints, etc. I've always found the
grooving to be a result of poor lubrication and not a result of
installation angles. You do want to keep the u-joint angles as low as
possible. 4 degrees works well. It's a problem of shaft whipping. The
higher the angles the more the rotational speed of the various parts of the
shaft vary from each other. Causes destruction of the shaft! Same problem
that Big 4X4's have when jacked way up. If you do have to do this sort of
thing then you need constant velocity joints like what Cadillac uses in the
big limo cars. Two u-joints on each end of the shaft. They did it for ride
comfort to the Master in the back!
Bruce A. Whiting
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