Cardan shafts is plural. It's rear engined. I'd go with 'half-shafts'; between the CV joints.
The Burney cut-away drawing calls out 'axle torque tube' which I interpret as a swing-axle.
_______
Campagna T-Rex 2012 Aero 3S
http://commons.wikimedia.org/wiki/File:Campagna_T-Rex_2012_Aero_3S_LSideFront_FOSSP_7April2013_%2814 586290092%29.jpg