JB33W Rear Castor Correction

1998 JB33W

So regarding rear castor correction on talking with people I have had three responses:

Yes castor correct, but install upside down for some extra tilt to avoid wearing down u joint
No don't change the rear
Yes but to level out the rear, like you do in the front

I have a 50mm lift keen to hear.

On a 50mm lift you wouldn’t need it. I have trailmaster 50mm and added 25mm spacers to that in the rear only and still do not need it.
But I would say that above 50mm from 75mm it can be considered.

And the only point is to improve drive shaft Ujoint angle.

Caster angle is "steering specific", so, since the rear axle of a Jimny doesn't steer, it doesn't have a caster angle.

That said, many people do speak of caster corrected rear arms, or fitting caster correction bushes to the rear arms, and as Yazuka has pointed out, the only reason is to improve the drive shaft UJ angle.

If you raise the nose of the differential to straighten out the propshaft, the back of the casing rolls round and the oil filler is lower, so you either have to move it, accept that there is less oil in the diff (and the pinion bearing is even further way from it) or find some way to get the extra oil in, like jacking up the rear until the axle is level before filling.

For a 50mm lift I wouldn't bother with correction, the UJ will just wear a bit faster and there will be a very small power loss