One problem related to manual transmission floor shifter has been reported for the 2008 Jeep Wrangler. The most recently reported issues are listed below.
The 6-speed manual transmission in my brand new 2008 Jeep Wrangler unlimited makes noise, and vibrates horribly going over rough roads! the shifter slams back and forth making contact with metal undercarriage. The dealer says they know of this problem but Chrysler currently has no fix and that it can even pop out of gear over rough terrain-terrible design!.