IIRC, the front coils should just fit right in. It actually is an inexpensive way to lift a TJ a few inches. Is it ideal? Not really, as the ride will be a little rough. But, if you're okay with that, again.. it's a cheap way to do a lift. The rears, however, require some modification to the top of the coils to get them to fit (or it's the other way around.. fronts require work while the rears fit perfect... can't remember). Regardless, modifying a coil is not something I wanted to do and ended up just doing something else.