new vibration after long arm install

This kind of goes along with the caster thread but I thought I better post it seperately.

Installed Rusty's 6 inch long arm upgrade. Set front caster at 7*. I have more vibration than I had before and nothing changed in the rear. Have I got my front driveshaft out of angle? What should the angle be?

Ultimately, it should be within 1* is what I'd think. CV shafts like the pinion to be angled to match the transfer case output shaft or SYE flange angle. I am no expert, just telling what I've found to work for me...

you want as much caster as you can get without creating vibes, so you may need to go with less caster or reposition the mounts on the axle to allow for different pinion rotation...

More caster is kind of like a motorcycle, gyroscopic precession keeps the bike going straight... same thing here, the longer wheel base means the XJ will go straighter down the road and be more difficult to turn as speeds increase.....

I had to run 6* of caster in the front to get the pinion angle within 1*. No vibes and now that I have 2 additional degrees of positive caster, my XJ don't wanna wander all over the highways and biways as much......

You can run 3 deg of caster at the least and still have a decent return to center.

As said before point the pinion center 1-2 deg under the tcase output center.