Hi we are guys from Swittzerland. We bought our truck in Canada and are now on the way down to Argentina. In the moment we are in Columbia.

Our Truck ist a Dodge Ram2500 1997 with a 5.9 Cummins diesel. 4wd and automatic transmission with overdrive. in the moment 250000Km

We are travelling with a camper that have 1200 kg 2320 pounds.

Here the problem

The last 4000 Kilometres some times the transmission has problems do decide the correct gear. So it flips between the gears. As we are heavy with our camper this problems was always, but only in special situations as strong wind or in the mountains and less regularly. When this problem is actual the transmission do not change in the highest gear even downhill.
Between this time sometimes for 3 to 4 days the transmission works correct and then the same problem come again.

Remarque, the Throttle position sensor (TPS) was changed end of June 2010 with 215000 Kilometres. The level of transmission oil is correct and we changed it 2 months ago.

So as here there are a lot of specialsts I hope that you can get me suggestions on this problem. Thank you in advance and sorry for my english

Christine