2001 Cobra with vibrating issues!!! please help!

I also have a 2001 Cobra but don't have that problem. Start simple. Are your tires balanced and in good order?

Whoa, whoa, whoa. Try indexing the driveshaft before you "throw parts at the problem."

To index the driveshaft, simply unbolt it and rotate it 90 degrees. Take note of the original configuration first, in case you need to index the driveshaft multiple times before the problem gets better.

Improperly balanced tires could also be a culprit...


Additionally, you might want to get in touch with user Lo Pony (try e-mailing him via his profile instead of sending a PM). He published a "driveline vibration" webpage specifically addressing the 99/01 driveline vibration issue in great detail (targeted at 99/01 cobras that had the IRS - some of the information was also pertinent to solid axle cars though). Unfortunately, his webpage is no longer hosted - it was an excellent resource! According to his user profile, he last visited the site in Sep of 2004...

G'luck.

What do you know about the 8.8 in there? Does it have factory gears, axles, etc?

But the others are right, start simple. Check the tires for odd wear first and foremost and work your way backwards through the drivetrain.

After 'as stated above' look at the Upper control arms and check if there's alot of play in the bushings: both axle mount and chassis.