I went for a period where I was driving with OD off, since I was doing mostly 30-45 mph driving. With the OD off, sometimes when I hit a bump, the rpm's will jump about 200-300. I think the reason it does it on bumps is because my foot presses the gas harder during the bump. But, it's weird that it does not ever do it when OD is on... Could turning the OD off cause a slight slip in the tranny? Ah well, I'm not too worried about it. Now I just drive with OD on always. It does seem weird, though.

 

My gues would be that since the truck is running at a higher rpm, even just a slight change in the throttle position is a lot more noticible then when your not at that higher rpm.

 

That could be it... It has no problems with any slipping during accelerationor anything like that. I thought maybe itcould bethe TPS or the TV cable...maybe that it was at a range very close to kicking into a lower gear, and the sudden depression of the gas pedal caused it to start to change, then by the rpm dropping before the change could occur, it just acted like a slip. Does that make sense?

 

Ah that is very strange, I have the exact OPPOSITE problem. When I'm in overdrive, in 4th gear, everytime I hit a bump I accidentily push the pedal,it's so fricken annoying! I don't know what I can do to avoid it, but I just have to have my foot on the pedal so tightly to keep monentum that if I try to let off for every bump, I'll loose all my speed and momentum!

 

Your problem makes more sense to me. Most transmissions equipped with overdrive are initially set to kick out of overdrive very easily for passing on the freeway. That is probably what yours is doing...that slight press on the gas pedal tells it to kick into Drive, then it aborts the change when you let off the pedal...that's my guess anyway. If mine were doing that, I wouldn't think too much of it...but mine doing it with OD off is what baffles me.

 

It's likely not kicking out of overdrive in 360's problem, but rather the TCC unlocking....mine does the same and i'm pretty damn positive it's the TPS being slightly worn out in that one "cruise" spot. Have yet to change it. It's also possible that the bump is tapping one of the switches on the brake pedal, there are multiple brake switches, so even if your cruise doesn't kick out or your brake lights don't come on (they're on seperate contacts) doesn't mean that the computer doesn't think you're on the brakes, and releases the TCC.

 

+1, its not switching to another gear, the torque convertor is unlocking. Change your TPS, it will most likely solve your problem

 

Same here with od on it is a pig...............I just drive with it off now.

 

I did the cleaning mod on my tps...guess I should just replace it instead of polishing a turd.