According to the MN12 Tech articles The only Thunderbird's and Cougar's that got the stiffer springs were the 89-92 XR7,and the 89-95 SC..The only exception being the 97 Thunderbird Sport that also came with these stiffer springs...
However I have a 91 Sport also,and pulled the tag off one of the front springs..The tag says (JVC 61.1/7356)..There is conflicting information,but in my honest opinion..Check your springs and look for the tag..
Should have a Spring Tag of "JVC" and the "B" Pillar Tag should be "J". English Load Rate (Lbs. Lb./in.) 1654 349-403, English Wire Diameter = 0.594-0.659
Should have a Spring Tag of "NUD" and the "B" Pillar Tag should be "J". English Load Rate (Lbs. Lb./in.) 1672 509-637, English Wire Diameter = 0.612-0.708
These are in fact the same springs used on the 89-92 XR7 and the 89-95 SC..Look for the tags on your springs..Good luck!
1991 Ford Thunderbird Sport
"If you don't know where you're going..Any road will take you there."
– George Harrison
Last edited by Rayo; 10-30-2010 at 04:58 PM.