Richard,
Thanks for 'splainen that!
Jim Davis
Fortson, GA
CF38690UO
The axle splines have one spline missing so they can only be assembled
one way. The driveshaft splines are not polarized and can be assembled
wrong. Having the yoke axes parallel means that the splines should be
assembled so that the yokes on each end are turned the same way. If you
lay the driveshaft on a table the flat surface of the yoke on each end
should lay flat on the table.
If a driveshaft is cut and re-welded, it must be welded in the correct
position so the joke axes are parallel.
This is because a universal joint operating at an angle will change
velocity as it rotates. (This is why we have CV (constant velocity)
joints for front wheel
drives.) The harder the angle, the more the velocity changes as it
turns. The output of the trans can be turning at a steady rate but the
driveshaft will speed
up and slow down twice with each revolution. If the yoke axes are
parallel AND the angle of the u-joint at the other end is the same but
opposite, the velocity changes will be neutralized and the diff flange
will turn at a steady rate. The TR6 driveshaft u-joints operate at a
very minimal angle so it is not a huge deal but it could vibrate if
assembled wrong.
Rotating the driveshaft 180 degrees in relation to the trans and/or diff
flange can help IF you happen to have some driveshaft runout AND trans
flange/diff flange runout that happened to be in the same direction. Try
one end at a time.
Richard Good
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