The CDL is inside the transfer case. Installation will require removing your current t/case from the vehicle, disassembling it and installing the parts. Don't really know how involved of a process it is to accomplish all that.

 

http://www.roverlandparts.com/1994-1...seshifter.aspx

http://www.roverlandparts.com/1999-2...lyrebuilt.aspx

Both of these will fit your truck and you will then have a CDL.
IF your t-case alreay has the CDLthen all you need is the shifter.