Take a look at the aluminum Ford IRS from the '06 to '10 Ford Explorer. The Explorer housing is on the left and the 03/04 Cobra housing (a good second choice) is on the right below;
The half shafts are available from GForce and they use the large 930 Porsche CV joints with special high strength 31 spline stubshafts for the larger Porsche CV's;
For the differential I used a Wavetrac torque biasing unit. They come with a lifetime warranty no matter what you use them for, street or track. Click here =>
WavetracŪ Torque Biasing Differential
You will have an extremely hard time breaking the package or any of its components. When you order the axles GForce will tell you how to measure for the half shafts. Follow their directions and you will be quite happy.
Ed