DCS/DCD Main shaft issue
The most common reason for replacing the transfer case shaft in DCS (as well as DCD) transfer cases is damage to the external splines on the side of the connection with the gearbox. At first, this manifests itself as excess play when starting and stopping, but as this problem progresses, it can result in the car's complete inability to move under its own power.
In Figure 1, we showed what damaged main shaft splines look like. Important note: When replacing the transfer case shaft, you should also replace the mating cup on the gearbox side — fortunately, this part is available separately.
