Dodge LX bodies (Charger, 300 and Magnum) have a known shifter assembly problem.
Tech Tip Description: If the shifter is stuck in park, and the condition is due to a broken interlock lever spring HOOK, do not replace the shifter. The Lever and spring are released in Kit 68088259AB. Use LOP 21-75-11-01 for the Lever replacement. The Kit includes an Instruction Sheet. Also, CSN K39 write-up could be referenced for instructions.
If the VIN under repair is in the range of CSN K39, do not order kit 68088259AB, and repair per the CSN.
The broken Lever Hook could be verified by looking inside the shifter assembly, through the opening at the front (park position), right (passenger side) corner. The lever is pink, and has a molded-in hook for the spring to attach to. If the hook is broke, and the spring connection is lost, replace the lever and spring