I Need help.. I have a 89 notch back 4 lug drum. I want to swap out to 5lug disc. I heard of all the trick but I know it is a pain. Would a 99 cobra IRS rear fit???? i know a 97 Cobra rear is longer but the 99 IRS rear should be about the same as mine. Please give me some help....:SNSign:
Both the '97 rearend and the '99 IRS are the same width. Either will go in your '89. They are a both wider than your '89 rearend. Many people have done this with good results. Have to pay close attention to tire size and backspacing.