Dodge: O/D off light on, dodge ram v8, computer shutting down

Question
While driving highway speed noticed engine rev up a bit. Looked at dash and O/D off light was on. Pushed button and light remained on. After getting to work I turned truck off and started again and light remains on with no response to the switch. It is a 1998 Dodge Ram V8 4x4

Answer
HEY DAN,YOU NEED TO GET IT SCANNED FOR TROUBLE CODES.WHEN THE LIGHT IS ON THIS CANCELS OVERDRIVE.IF THE COMPUTER SEE A PROBLEM IT WILL SHUT DOWN THE OVERDRIVE AND THE LOCK UP COMMAND. AN EXAMPLE OF THE COMPUTER SHUTTING DOWN OVERDRIVE WOULD BE THE TRANS TEMP SENSOR READING FLUID TEMP OVER 247 DEGREES.EVEN IF THE TRANS IS NOT THAT HOT,IF THE SENSOR SENDS THAT SIGNAL TO THE COMPUTER IT WILL TURN THE LIGHT ON AND CANCEL OVERDRIVE. HAVE IT SCANNED AND MAKE SURE THEY LOOK AT THE TRANS DATA STREAM AND LOOK AT ALL THE PERAMETERS.GET BACK TO ME WITH THE CODES,THANKS,TIM.