Not sure if I have asked about this before, but I am ready to weld brackets on axle case. Any one know what angle the diff should be to ensure the UJs get 'worked 'properly?

CP

Pretty sure that the drive flange and the brackets should be in the same plane, the rise and fall of the axle will then be roughly equal on the UJ's of the prop. HTH Ray

The idea is to have the gearbox and diff misaligned, so the propshat is out of alignment.
That makes the joints work. If it is dead straight there are issues.

CP

As per Chippy I would say that the flange and brackets should be parallel so that the joint angles are split equally to avoid phasing problems. Unless the prop and gearbox are at exactly the same height in the chassis then the joints will always have a bit of on angle on them, also being live axle unless you plan to run it on axle stands for milions of miles then the joints will be moving constantly anyway.

Davie

If I remember rightly the Locost books suggest keeping everything in line and parallel as much as possible when at rest.

Can I ask why having a straight UJ causes issues? What sort of issues?

If the shafts are all perfectly in line then the needles inside the UJ bearings don't move and get hammered into the same spot constantly and never move enough to redistribute lubricant causing rapid wear.

Ideally the flange faces should be parallel (to reduce phasing problems of non CV joints) but offset slightly to ensure the joints move constantly.

Cheers
Davie