When my truck had 80k on it all the shift (speed) sensors went out in my tranny. Fixed it and the truck a few thousand later acted up so Dodge re-wired something that had to do with computer to the odometer (they said the old way picked up interference and made the truck shift wrong) this fixed the problem. Now with the truck running at exactly 45mph (and sometimes in a rang of 45 to 50) it will jump with Over Drive on. Turn OD off and the truck does fine. If I'm accelerating threw 45 it shifts fine, it only happens if I'm running slowly at 45mph. I drive on flat land and it doesn’t matter if I have a trailer or not. The truck just rolled 99k,,, any ideas??

 

You shouldn't be in OD at 45-50 mph. Get the speed up to 55-60 before you use OD.

 

The truck shifts into OD on it's own there. Never was a problem before????

 

Mine shifts into OD just above 42mph if I am not accelerating.

 

So does mine, that's why I leave OD off unless I intend to keep on accelerating.
You can adjust the tps to change the mph this occurs but it will effect other shifts as well, usually in a negative manner.

 

If yall leave the OD on and run at 45mph will your truck jump around???

 

Wouldn't this be tranny shudder? Does your torque converter slip at all? Mine shudders at around 45. If I am only giving it a little bit of throttle it shifts into OD at about 36 MPH, otherwise normal acceleration is at about 41 or so. My service manual says if it doesn't shift into OD under light throttle at 35, to "get it checked out by a professional"

 

Yes my tc will lock/unlock at that speed.