No, a JK axle will not bolt into a TJ. They are 5" wider, with different locations for control arms and springs. If you found a pair of front and rear axles, and bought and installed two weld-on bracket kits for a TJ, then you would have a minor strength upgrade and 5" wider track for a lot of money. Keep looking for a different axle. The Ford 8.8's are readily available and cheap, but you still will need that bracket kit weleded on.