from the Jammin site...
The new Jammin X2 Buggy upgraded with New Chassis Layout, Lightweight Drive Line Parts, Carbon Fiber Towers, Super Big Bore 16mm Shocks, Spiral Cut Low Friction Ring and Pinion Gears front and rear, Proline REVOLVER Tires, Top Loading Servo Saver, Lunsford Titanium Turnbuckles and the Hi-Down Force Wing.
More specifics- truggy gearing, alu dog bone center prop shafts, center diff mount is plastic-but same geometry and construction as the cnc model