Well I'll start with the back story. It's a 2006 GT with the 5r55s Auto. Iv'e got an American Muscle/Bama tune installed. My plan was to go to the strip on Sunday. Never have had any probles or indications of a problem in the 2 years that I've owned it. The car drove fine on Friday when I was doing a couple of errands, then later that evening, I brought the car down to my shop so I could put my DR's on and pull some weight out of the car on Saturday. The car seemed to drive fine down to the shop, untill I was backing up into the shop. It felt kind of like it was slipping as I was backing up, and It was slow engaging into reverse, if I gave it just a touch of throttle it would engage right away and go backwards. Seemed to engage into drive just fine. So I parked it in the shop and the next morning, I put my tires on and changed over to my 91 race tune, and pulled some weight out of the car. Started the car up and let it warm up, and figured I would see if it was acting funny in reverse again. Put it in reverse...got nothing, tried drive....got nothing again, tried moving back and forth between gears and you can't hear anything engage. The RPM's jump slightly when you put into drive or reverse. If you put it into park from a gear, you can kind of hear it dissengage. Tried to install one of my other tunes just hoping that I had a corrupt file...but it didn't change anything. Tried unhooking the battery for a little while, but same result. Haven't ever seen any leaks and it's spotless underneath so I'm not loosing any fluid. I'm also not getting any DTC's from my SCT X3, so I'm at a loss from here. I'm guessing it's the front pump, and if thats the case I'm probably looking at a new tranny. So my next question is, are the TCI street fighters seeming to hold up alright, or are the level 10's better, or do I go with a referb unit and trade it off for a manual. I'm not going to be able to do a 4r70w conversion so thats off my list. I've got a few VERY good tranny shops that I'm going to call on Monday and talk to and see what they think might be going on, but I'm sure without a good scan tool, it will be a pretty mute point. Just looking for some advice from ones that have had this experience happen to them. Any help is greatly appreciated.