Its an issue with the 6spd in the 05-06. Unfortunately, Jeep decided to go with a New Venture 3k series transmission (NV3550) and it is a POS. Not to go into too much more detail, there is a TSB for a few different throw out bearing issues. If you are still in warranty, take it to the dealer. They are going to replace the slave cylinder rod I believe, and if that doesn't fix it (never really does..) they are going to replace the throw out bearing. If you are out of warranty, either do the work yourself, or deal.