03 Dodge Ram 3500 has problems shifting.

What is your question?

Driving normally down the road the truck drops in power to lower gear for awhile till it finally shifts up. This can take up to miles and 10 plus minutes. Recently just shut off while coming to stop at stop sign with lots of clunks then dying .

What makes this problem better or worse?

Been doing it more now that the temperature has gotten colder

How long has your 2003 Dodge Ram 3500 had this problem?

Months