Rear axle is a 12 bolt with limited slip. Lockers are available for both the front and rear axles.
There is a current thread where member "Ascender" is in the work of putting a 60/14 bolt in his VX along with a drivetrain swap.
Other front axle swap option is the Dana 44 from a 78-79 waggy...passenger drop and the correct width to match our rear 12 bolt.
Here is the info on the steering...
The Vehicross uses a recirculating ball type steering box, along with a vaiable-assist power unit. This provides the VehiCROSS with smooth accurate steering but, minimizes the potential to have the wheel jerked out of your hand when driving on rough pavement or off-roading.

Steering Ratio = 20.1:1

Turning circle = 34.1ft (Curb to curb)
Other VX specs can be found HERE