This past Friday I actually made a swap back to IRS from a solid axle. The axle was an 8.8 out of a 2001 Bullit. I had upgraded to 3.73s, Moser 31 spline axles, 05 mustang gt locker, MM spherical bearing lower control arms, UPR spherical bearing upper control arms. The IRS has Steeda diff brace, subframe bushings, and diff bushings.