mopar offers a kit.
Six Speed Transmission Kit (Not Shown)
P5155123 Transmission, 2008 Viper 6-SPD, Includes
Transmission, Shifter Base, Prop Shaft, and
Crossmsmber
Clutch Kit (Not Shown)
P5155122 Clutch Conversion Kit, Converts a 2005-06 Viper to a
2008 Dual Disc Clutch, Requires P5155123. Not
compatible on Vipers with a Flywheel Crank Trigger