I wrote a how to for a NON IRS car, here is the link to it: Installing Mustang Lowering Springs
if you have an IRS car its just about as easy, the only difference is you remove the back frame bolts on the IRS after you remove the exhaust hanger bolts and then use a jack to slowly tilt the IRS down and backwards. The rear springs FALL out.
if you have an IRS car its just about as easy, the only difference is you remove the back frame bolts on the IRS after you remove the exhaust hanger bolts and then use a jack to slowly tilt the IRS down and backwards. The rear springs FALL out.