I was pulling my race car trailer(6500lbs) last week and I pulled out to pass(55-60mph) and stepped on it and my tranmission shuddered so hard the dash shook and the ABS/Brake lights came on. I was in TOW/HAUL mode when it happened,but now it does it all the time in high gear but the lower gears are fine. Its booked in to the dealer tomorrow so I hope its a quick fix beacuse I need the truck to pull my trailer next weekend???????

 

A programmer will do that to a stock tranny if you're not careful. Sounds like the TC is gone. Better hope they don't look for one because they'll probably find traces of the Predator.