I am having the same problem with the 2003 Windstar but I have the axle section on it and it still does not let me have 2x4 and 4x4
Here is the wheel and axle sections for it
meshwheels2
;radius,width,numrays,node1,node2,snode,braked,propulsed,arm,mass,spring,damping,facemat bandmat
0.34...