Truck ran perfect & just died no reason. Hr. Later it started & wouldn't shift?

What is your question?

I know the speed sensors have been replaced. Plus we took it to the transmission guy in town and he road with us and hooked up a computer to it and was able to make it shift with that. The ABS light is on and the speedometer quit at the same time when it started back after one hour that didn't work either. Tried to replace the dash cluster (speedo), and the speedometer still didn't work. Tried to replace the main computer which did nothing. Please help.

What makes this problem better or worse?

Nothing

How long has your 2002 Oldsmobile Bravada had this problem?

Truck has been down 6 months can't drive it.