I have a 99 ram 1500 sport that is locking it self in limp mode when it gets below freezing. If I drive about 15 mile or so and turn off and leave for 10 minutes or so I come back and it will shift fine. If it dose not get below freezing at night it drives fine. Transmission rebuilt about 3000miles ago. Any help would much appreciated.

 

Best to return to the shop that did your rebuild . No sense voiding any warranty