Won t shift out of park

could be a few things possibly faulty brake pedal switch, faulty solenoid in the gear selector, bad wiring. I would probably start with brake pedal switch .

https://itstillruns.com/dodge-truck-wont-go-park-7998915.html
https://dodgeforum.com/forum/3rd-gen-ram-tech/390161-48re-shift-lever-mod-fix.html
https://dodgeforum.com/forum/dodge-ram-van/345695-won-t-shift-into-park.html
https://www.dodgetalk.com/threads/truck-wont-go-into-park.513785/


https://www.2carpros.com/questions/2002-dodge-ram-wont-shift-into-park

What make , model , year an engine size ? All vehicles have a safety system ,shifter interlock . This system will not let the gear selector move from park unless the driver is pushing the brake pedal . Has a electrically controlled solenoid that locks it in park , also has brake pedal switch . Could have a control module involved ,like a BCM - body control module etc.... Maybe he broke the gear selector cable or a plastic part on the end of the cable. Looking under the hood at the transmission connection of the cable while someone moves the gear selector ,does the transmission selector move .

Probably a problem with the shifter interlock system . Won't allow the gear selector to move from park with the engine running unless the driver is pushing on the brake pedal . Locking solenoid in the shifter , brake pedal switch , wiring etc... may even have a body control module in the loop controlling these system . Do the brake light's work ? Some of these system's have a release point in the shifter assembly . Don't know if this is your problem without checking it out .
Shifter won move
Shifter Stuck in Park Wont Move Easy Fix Most Make Model Vehicles

the selector has a sensor on brake pedal .

If it won't shift from park my first question would be how do you get it Into neutral? Sounds like you may have a gear selector sensor issue .

Could be the brake switch or the solenoid that locks the shifter in park.
That circuit would need to be tested.

gearbox selector out of adjustment at the gearbox
needs to be lined up in neutral position and rest should work

internal park locking pal worn

an engine/gearbox mount broken or sagging

Most likely the switch on the brake pedal, because you have to push the brake pedal first to get it out of park, Right ?

Soounds like the shop that did the work did not install the shift cable back onto the transmission fullky and it popped off. Look under the truck, drivers side, and you may see a cable dangling. If so that needs to be reconnected to the post on the transmission shift selector on the transmission.it should pop on with a solid push.