hi, I have fixed a few of these, add a 14ga ground, batt to block, to trans case, problem as described to me is, tans range switch signal gets lost, and tcm/pcm do not command tipim, very hard to prove because data stream will not show this, I got this info from chry tech at direct hit, also, batt ground at block known to be issue, clean it, batt condition and batt connections very important on chry/jeep products.

Ken Meads
Technician
Lone Star Auto Service
Houston, Texas, USA