IRS Swap problems
 

I swapped my straight axle out of my Mach 1 for an 03 Cobra IRS. Now my driveshaft is vibrating. I did have the shaft balanced. Note: My car is and AOD and the cobra is of course 6 speed. Any help here?:wallbash:

If you don't mind me asking....I'm curious of what your plans are for the car...Road Racing?? I'm curious because I know a lot of Cobra guys that complain about the IRS and would love to have a solid axle like us.