transmission will not go above 2nd
#2
#4
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If it cycles between having first gear and no first gear whenever it feels like it, it is probably one or more of the speed sensors. There are three. One on the outside of the tranny, one in the pan and one on the rear differential. All are about $100 each. Good Luck!
#5
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Do you have a check engine light on? Same problem happened to me. Suddenly my Durango will not shift beyond 2nd gear unless I full throttle it to try to force it to upshift. Check engine light just happen to come on when this issue surfaced. Took it the dealer while it was still under warranty and found out the Governor Actuator switches went out.