Cj's have leaves not coils all the way around.

Either way the main problem is that the jeep 4wd system leaves the front drivetrain connected and spinning at the hubs even in 2wd. The spinning axles can start a harmonic imbalance and start to bounce around all over the place.

And ancient or not the new jk rubicon is probably the best off the shelf affordable (sorta) off roader you can buy. Solid axles flex a lot better then ifs out of the box.