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An XJ coil on a TJ will give a taller lift. I have my 3" coils on the front of my kids TJ yielding 5" of lift

I understand. You are relatively new, so you don't know me. I am kinda old, so I was around in the 70s when lift kits started becoming popular. During that time, I had a business designing and...

If you are not doing anything hardcore, no you won't have any problem. However if you are going to get serious off road, there is a potential to pull the rear driveline off the tail shaft.

It is all fact. If you are referring to the spacer blocks, they are used on other vehicles like pickups. But those vehicles have much thicker springs with higher spring rates and do not suffer from...

Actually about 3.5"

You take the bottom three S10 leaves and substitute them for the bottom three XJ leaves. simple substitution

The only thing you keep is the main leaf. So if you use that route, you don't have to repair or upgrade the rest.

If you are going the full 3" I would use the S10 bastard pack. That will save you a lot of money.