2001 5.9 first to second shift problem

here's the deal the other day i pulled out of a gas station and put the pedal to the floor, wasn't paying attention to the RPM's and and next thing i know i'm bouncing off the rev. limiter, as soon as i let off a little bit it shifted to second. So later that day I figured i would see if it would do it again, and it did.
I haven't tried it again to see if it was still doin it.

Does anyone know what would cause this problem?, Thanks

I read that it could be the Governor Control System... the Governor Solenoid and the Transducer...

or have your trans fluid and filter changed....just check

speed sensors, inexpensive and easy to fix. do both, 1 on the rear pumpkin and 1 on the trans. buy them at an auto parts store. once you see what they look like they will be easy to spot under the truck.