WE HAVE A 1998 CHEVY 4X4,THE GAUGES STOP WORKING AND THE TRANS STAYS IN OVERDRIVE,BUT CAN SHIFT IT MANUALLY,ONCE THE GAUGES START WORKING AGAIN IT SHIFTS FINE,ANY HELP WOULD BE APPREICATED.........

That sounds like a big electrical issue....I'm not really sure on that one. I'll leave it to someone else with more experience.

WE HAVE A 1998 CHEVY 4X4,THE GAUGES STOP WORKING AND THE TRANS STAYS IN OVERDRIVE,BUT CAN SHIFT IT MANUALLY,ONCE THE GAUGES START WORKING AGAIN IT SHIFTS FINE,ANY HELP WOULD BE APPREICATED.........

How does the car start? Does any other electrical stuff in the car turn off as well?!?

This sounds simmilar to what happened to me when my alternator went out, that's why I ask.