The TPS on the throttle body controls shift points. When they get
contaminated with stuff like salt water or coolant, they can act
strange. A good spray clean with contact cleaner or WD40 on the TPS
connection might be needed.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

JC wrote:
>
> Took my Cherokee to the outer banks to do some fishing and drove it in the
> sand until noticing it was overheating. Immediately stopped and let it cool
> down and realized I was losing coolant. Replaced the water pump and
> thermostat after carefully driving it home but now the transmission shifts
> from first to overdrive if I have it in D, or first to third if in 3. Fluid
> level is normal, and other than the shifting problem it runs fine. has
> anybody seen this problem and is there a fix (other than replacing the
> transmission)?
> thanks,
> JC