Chevrolet Repair: Transmission Problem, gentle fashion, engine temp

Question
Last night while driving my 1998 Z71 4w drive truck I was going to pass a car in front of me.
I was at 50mph and floor boarded my truck. I noticed that OD did not seem to grab, I then heard the engine just reving high with no increase of speed.
The attemp to pass the car was aborted as another car was oncoming and I did not have the speed needed to complete the pass.
Afterwards I floored the truck a few more times and the same thing, no OD and only enginbe reving high with no increase of speed.
I did notice that instead of suddenly flooring the truck I could ease into the throttle around 50mph and OD seemed to grab but would seem to throw out as I increased the throttle.
Later I tried just easy on the throttle and slowly bring the speed up to top end. Kinda like bypassing OD and just getting the truck to max speed in a gentle fashion. 80mph was my top end speed.
There is NO WARNING light that comes on. Tranny fluid is fine and filter and fluid was changed just a few weeks ago. Engine temp is fine. Auto 1st, 2nd, and 3rd gear seems fine.
A friend suggest it may be a sensor or silenoid problem. Any ideas?
Thanks,
Rusty

Answer
Could be:

1. OD solenoid or other solenoid early stage failure.
2. Trans pressure switch plate problems.
3. Early stage of OD portion of converter failure.
4. Early stage of internal trans problems.
5. Computer signal problems to the transmission.

You are going to need to have a qualifed transmission rebuilder perform some diagnostic procedures on the trans as well as driving the vehicle in order to determine EXACTLY what the cause is.


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