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**robnolimit** · 10-27-2010, 03:56 PM

Well, I once built an IRS from scratch, and can say that I don't recomend it. That route will cost you plenty in time, money and heartache. But, an IRS may be more reasonable to do than you think. We do a bunch of them here using the Crown Vic - TownCar IRS unit. OK, don't gasp too hard. I know it's a Ford unit, but so is a 9", don't hate on it too much. The Crown Vic IRS unbolts from the doner car in a cradle with four big bolts and drops out. Salvage yard price is around $400 in So Cal. These have an 8.8" gear set with ltd. slip, disk brakes, and are easily converted to air ride. Swapping one in is pretty easy, you just trim the stock cradle to fit into your rails, set the pinion angle, and true up the CL then weld in the cradle. From there it's a bolt in. Check one out on your next bone-yard excursion.

10-27-2010, 03:56 PM	#173
robnolimit Senior Member Join Date: Jul 2010 Location: Dandridge, Tn. USA Posts: 2,226	Re: Make it handle Well, I once built an IRS from scratch, and can say that I don't recomend it. That route will cost you plenty in time, money and heartache. But, an IRS may be more reasonable to do than you think. We do a bunch of them here using the Crown Vic - TownCar IRS unit. OK, don't gasp too hard. I know it's a Ford unit, but so is a 9", don't hate on it too much. The Crown Vic IRS unbolts from the doner car in a cradle with four big bolts and drops out. Salvage yard price is around $400 in So Cal. These have an 8.8" gear set with ltd. slip, disk brakes, and are easily converted to air ride. Swapping one in is pretty easy, you just trim the stock cradle to fit into your rails, set the pinion angle, and true up the CL then weld in the cradle. From there it's a bolt in. Check one out on your next bone-yard excursion.