I bought the Quadratec HD leafs for the rear, and the springs for the front. I think the lift is 1 3/4" all around. Just wondering if I should double up isolators up front? I tried putting 30x9.5 on my stock sagging suspension and the tires were rubbing badly up front, so I want to make sure I have enough clearance when I do this. Good idea to double up isolators or bad?

 

If your trying to mount those 30's on stock rims chances are your rubbing on your lower control arms and the only way to fix that is rims with more off set or wheel spacers.

 

what he said ^.

and yeah, it's ok to double up on the isolators.

 

These are mounted on 15x8 D-Windows. I believe the back spacing is either 4 or 4.25". They are from Crown automotive. Would I still rub on the control arms even with the 4 or 4.25 backspacing?

 

Well where are you rubbing? With those rims the lca's shouldn't be a problem I don't think, if your rubbing on the fenders you'll either have to go higher or start cutting.

 

They wouldn't tell me where it was rubbing. Unfortunately I had to leave the XJ at the shop while they did it so I did not see anything. I will have to throw them on myself tonight and see. No matter what though, a 2" lift should be large enough to fit 30's underneath there?