I guess it would depend on springs and shocks. I am about to do this on mine. I have Koni's with coil overs. I am going to try and lower the top mount to the middle or bottom of the frame rail. This should put that inside the wheel. I can lower the bottom mount some also. Then i will put a limiting strap on the axle so at full droop the rim cant come in contact with the mount.
I am pretty ignorant on IRS so...
I believe a tub would be A waste if not relocating the springs or shocks. After treatment with a BFH I find the stock location coilover to be first to hit then the stock coil spring upper mount.
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