I noticed there's a new TSB for the Grand Cherokee for the tranny with the V6 to fix a variety of issues for November 12 and earlier builds but they don't mention the Durango. Being the same systems I'd think there's probably one for the Durango too.
http://www.wk2jeeps.com/tsb/tsb_wk2_2100713c.pdf
I usually have a harsh shift from 1 to 2 when coasting down a slight incline.
http://www.wk2jeeps.com/tsb/tsb_wk2_2100713c.pdf
I usually have a harsh shift from 1 to 2 when coasting down a slight incline.