247 to 242 help

I just got a 2002 grand cherokee loredo with the quadratrac II system and I want to swap it over to the selectrac 242 TC. I have read a lot on here about it but I just wanted to be sure I know what I need. My jeep has the 4.0 which seems to be rare with the 247 so most of the swap threads all deal with the 4.7. Can I just swap to the 242 TC without a new rear DS or will I still need the rear DS from . another model? Thanks for the help for this jeep newbie!