[rlearp]

They all have IRS but if I remember right the 1889-1995 SC's all had 8.8 IRS with 3.27 gears.

The 1991 Mercury Cougar XR7 5.0L HO had a 8.8 IRS with 3.08
(I had one of these, rare car).

The 1990 Mercury Cougar XR7 3.8L SC had a 8.8 IRS with 3.27, also a rare car.

All the rest were 7.5" IRS if I remember right but you could check on the MN-12 forum.