[Bill Bess]

I agree, you should just take it back to the dealer that you bought it from and get all your money back including the 5K.

With that being said, you invested $5K to up grade and fix the problem, getting your money that back from your dealer is going to be tuff. if the selling dealer would have fixed it, in lieu of you doing it on your own perhaps the problem would have been solved.
There are millions of Jeeps that have been modified after the car was sold new, in some cases the dealers will send them out to get it modified prior to the new car sale.

Just get a lawyer and go after the Dealers sorry A** . Chrysler corp. didn't modifiy the Jeep originally so they are off the hook.
Good Luck, remember "Buyer Beware".