Overdrive Help
 

I have a 93 D-350 on the way home from work the overdrive was kicking in & out when going uphill. It had done this once or twice in the past but I thought it was a fluke. Need help on what it might be.

Look in the sticky and read about testing the tps (throttle position sensor) that is probably what is wrong. You can replace it with a potentiometer there is also a how to article for that in the sticky.