I have a 99 durango not sure what trans I have but the problem is won't kick into passing gear can drive it fine in the city and even on the highway but stomp down on the gas and motor revs to red line and won't speed up let off gas and keeps going not sure where to start to fig it out hope some have ideas on the problem

 

There is a cable from the throttlebody to the trans (monitors your foot) that should be adjusted as a start to figuring it out.