Transmission Noise problems of the 2006 Toyota Tundra

I was driving north out of phoenix arizona on I-17 just past black canyon city, with my cruise control set at 75 mph. There is a very long hill going north to sunset point. Prior to approaching the hill I canceled the cruise so that the transmission wouldn't hunt gears. I drove up the hill at 65 to 75 mph (no cruise). When I made the top of the hill at sunset point and leveled out, I accelerated the vehicle to 75 mph and hit resume. The engine raced to 5200 rpm. I redline at 5700 rpm. The transmission did not follow suite. It was as if I was in neutral revving the engine. I immediately canceled the cruise and drove a mile or so without cruise, then decided to try it again. Everything worked normal. I have been in contact with my dealers service dept. And they are baffled. They have not looked at it as yet due to their schedule. As soon as they can get me in they will. They did say that there should have been a check engine light, but there was not. They are hoping that the onboard computer recorded it. Not only is this a major safety hazard, but it could have caused my engine to blow up. I'm not sure what reaction my wife would have had. She drives all the vehicles we have and they both have cruise, yet she is not that familiar wit rpm's and redlines and the issue that follow. When I have allowed the cruise to pull me up an incline it usually drops 1 or two gears and the rpm's are around 3000 to 3200. This I consider normal. I had a 1999 Toyota tacoma with a six cylinder engine and cruise, so I am very familiar with the system. I purchased the vehicle from tim's Toyota in prescott, I also brought to their attention a noise that I heard in the right front suspension and they are going to take care of it under a new recall that has not even been sent to customers, nor was the service dept aware of it.