Drilling upper control arms

Has anyone elongated the hole on the foward end of the upper control arms for caster /pinion adjustment. I need the hole located about 1/4 inch foward . I Thought about welding a flat washer on either side of the arm and drilling a new hole. Any ideas?

burgess said:

Has anyone elongated the hole on the foward end of the upper control arms for caster /pinion adjustment. I need the hole located about 1/4 inch foward . I Thought about welding a flat washer on either side of the arm and drilling a new hole. Any ideas?

Click to expand...

Yes, years ago I did this mod with stock UCA's to dial in the caster........adjustable arms are your friend, but it will work on the cheap. Weld on a fender washer and drill a new hole.

Why not just use the caster adjustment that is already built into the lower control arm mount?

Mmm, that photo looks familiar.
You cant not leave the upper arm hole with a slot at all. Do it as shown above from my site or weld up the old hole first before drilling a new one or weld in a washer as stated above if for some reason you cannot shim the power arms as the factory does. www.go.jeep-xj.info