Having trouble with automatic transmission. on 1996 Dodge Ram 2500

Doesn't always shift up. Sometimes hesitates and shifts hard into reverse. Seems to be more often than not when it is cold but not always the case. What might it be?

Asked by for the 1996 Dodge Ram 2500
2 answers
Has the check engine light been on , or is it on now?
If so, I would start thee.
It's likely t be an internal transmission problem but I would start by getting the oil hot, drain it drop the trans pan change the oil and filter using the correct Dodge fluid and add a product called Lubegaurd its quite a good additive. When the oil pan is off check for debris in the bottom of the oil pan.