im just driving my ram 3500 down the road. dial set to 2hi (dry pavment) and without even asking me first it just shifts the t case to 4hi, and it also indicates this in the cluster and the 4hi led above the **** also is lit. I then turn the **** to 4hi then back to 2hi the t case and both indicators go back to 2hi. then pretty soon it does it again no rhyme or reason. any thoughts? I suspect the selector switch to be at fault.

 

I would agree.