1999 Dodge Caravan

Transmission problem
1999 Dodge Caravan 6 cyl Front Wheel Drive Automatic 123000 miles

3.0L V6. Issue/ question is as follows. Driving and depending on load (hill) or on highway the trans will shift up/down between gears and not hold them as used to. Example is highway driving about 60 will feel/hear shifts between 3rd and OD continual. Will not hold OD during level highway area but will downshift with slightest change in pedal or incline. No engine codes. Engine vacuum steady. Not stalling out. Speedo stays accurate to speed going. Trans fluid good, not burnt. Hot or cold engine or trans. No harsh shifts. I see notes about shift solonoids for issues with not changing gears but the trans does change but not hold gear as used to. Batt reset, trans reset (ign on/off 4 times?) Thoughts on isolation or prior?
November 30, 2009.

Condition maybe caused by a difference in trans output shaft speed and turbine sensor speed. Slight slipping in trans not detectable to driver will caus trans to shift out of OD. Need to have diagnostic scan toll hooked up to observe sensors signal to PCM. A code reader will NOT work.
Hope this helps
Thanks for donate

Nov 30, 2009.
Attempt ot get this done at Autozone by this weekend. When I have the car checked with the scan tool what are the differences that I need to look for with the sensor signals that indicate a problem with one or between the two? Voltage levels of the sensors itself, voltage differences between two readings or a digit coded readout that reflects a failure? Thanks.

Dec 1, 2009.
Auto Zone uses a code reader you need diagnostic scan tool operated by a profesional a trans repair shop should be able to check it out.

Dec 1, 2009.