I MUST be missing something here...OR, there is a mileage typo above...especially as you have shown interest in various performance mods in several threads.
Have you ever had the car examined by a Viper Tech in the 17,988 miles since the problem was first noticed? Ever bled the clutch? If no EXPERIENCED Viper Tech is available locally, ship it to someone with experience...before your warranty is out. Good luck !!!
Edit: Here is a link to a local shop that has done work for some of our members...being posted only in an information sharing spirit:
RPM Transmissions T56 T-56 4L60E 4L65E
Note: while the next link addresses the T-56, they can do similar upgrades for TR-6060's...including changing 5th gear to a 0.80 (a la 2010) if you like!!!
Level V T56