The automatic transmission can develop problems like harsh shifting, shuddering between shifts, and a buzzing while in Reverse. Repairs for many of these problems are outlined in service bulletins and require removal and disassembly of the transmission.
Car Problem Reports
Chrysler Concorde Automatic Transmission May Have Shifting Issues/Noise While in Reverse
Chrysler Concorde Problem
Visitor, 1993 Chrysler Concorde, 12,000 mi
my car stop changing geers after about 5minutes tt 15 minutes stays in one geer after i stop turn engine off for awhile it will change geers