I need a little info before doing this myself or taking to dealer. The Dakota will jump in 4 low or 4 high,without turning the knob, then jump back all on its own, the switch will still work if turned to either. After another escapade last nite, drove home in 4 low (till the driveway)then normal, sitting in park touched the brake pedal, right back in 4 low. With the key off and out i can still hear it trying to move in and out. ANY IDEAS, HELP

Drive though any deep water lately?
Shift motor on T-case could be full of water making is have a mind of its own.
Faulty switch, Integrated Power Module to list other possible causes.
Getting the DTC's read at the dealer should be your next step before something gets damaged.

Operation Description from the FCM

The Front Control Module (FCM) utilizes the input from the transfer case mounted mode sensor, the instrument panel mounted selector switch, and the following information from the vehicle's CAN bus to determine if a shift is allowed.

Engine RPM and Vehicle Speed
Diagnostic Requests
Manual Transmission Clutch Switch
Brake Applied
PRNDL
Ignition Status
ABS Messages
Once the FCM determines that a requested shift is allowed, it actuates the bi-directional shift motor as necessary to achieve the desired transfer case operating mode. The FCM also monitors the mode sensor while controlling the shift motor to determine the status of the shift attempt.

Not much of anything is hard wired anymore.

Sounds like I'm taking the truck and jar of Vaseline to the dealer

Not all dealers are the same.
We have a standard fee for diagnostic scan and its competitive to most all the independent garages in the area.
A lot of people assume its gonna be expensive.
So don't get out the vasaline yet...until you have to buy the parts
Lol