on the 2008-2010 Hemi WK's you can disable the MDS by placing the gear selector in drive, then clicking once down, placing the vehicle in 5th gear (shown on the display).....you get all 5 gears but no MDS. this was one of the improvements introduced with the 2008 model.
2008 Grand Cherokee Limited 4X4, Light Greystone Pearlcoat, Hemi, Tow Group, 18" Chrome Clad Wheels. Original owner, 20,000 miles
2002 Wrangler Sahara, black, 4.0L, 5-speed, Dana 44 rear axle with Trac Loc LSD, duel tan tops, Canyon wheels with Wrangler Silent Armors. 75,000 miles, 2nd owner.