Solstice IRS. It uses a CTS diff. You might get away with just a CTS (non-V) diff or go to the V - Would need some research.
Looks like Mallet might use the stock diff (maybe just a ratio change?) Some good reading
here and
here.
Another thought; Keep the 944 rear suspension and simply replace the transaxle with a CTS/Solstice diff and axles..!
As far as widening the body. we all know you have the skills not to have to buy anything buy consumables to make that happen
Don't forget about the insurance auto auction houses like copart and iaai for your parts car procurement.
...and dome Solstice Porn:
