Yes Crown HD will fit. Assuming stock diff cover. Check the track bar mounting hole on the passenger side for being wallowed out. That ultimately fixed a 45 MPH shimmy I had. Jks adjustable or currie would also recenter your axles with that lift.
2006 Rubi LJ, 6 spd. OME 2.5" HD spring lift, 1.25" JKS BL, MML, discos, front & rear track bars, ZJ steering links, lots of LEDs, Shittybuilt front & rear bumpers, Novak transfer case cable.....blah blah blah