BobRowe, it was just an article found. Someone else's problem.

Marcilui, the TPS for your Jeep costs $79 US at the local parts store. They can be found cheaper but be sure to get the right one for your Jeep if you decide to try it. As BigJim said, buy one and put it on, what have you got to lose (besides $80)? It may or may not be the problem. You may need to buy a tool for the job also, Some I've seen use Torx screws to hold them on. The screws also may have thread lock compound on them so be sure to use the right tool and don't strip the heads. I've even seen one Jeep that had security Torx screws (like regular torx but with a pin in the center) in the TPS.

The story you found is why I hate to think about transmission shops. People are generally so uninformed about how transmissions work they will believe the only option is a complete overhaul or replacement of their finicky transmission. Usually the shop will talk the "Mark" into buying a rebuilt transmission. Then the shop, at their leisure, will repair the other transmission for very little money and sell it for $1200 to the next poor guy that comes in needing a TPS or a simple adjustment. Its quite a racket, like some brake shops, they offer free inspections playing the safety card, they will always find problems. And if they think they can get away with it, and they often do, they sell the customer hundreds of dollars worth of new parts they really didn't need. I'm sure there are good honest shops out there, I just don't know where!