Silver, if there is no difference in the cars than just the drivetrain... why is it almost impossible to do an AWD conversion on the GS-T's but a LOT simpler to do it on the Spyder's?

 

The unibody is the same, the subframes are what make the GS-T and GSX different, some of the bolts are longer on the GSX also. The Spyders are heavily bolstered on the body because it does not have the roof to help with structural integrity. The bottom of all three are the same...if they were bare. Once the trims are decided, then the little parts that make those cars different go on or they have bolt openings welded shut, etc.
I know you guys have seen me post this before, but I'll post it again to help clear up the swap and the components needed from the donor GSX.
http://www.automotivearticles.com/AWD_Conversion.shtml

 

An AWD swap is impossible on a 1G because they don't all come with the tunnel. You may have remembered something like this, but it's about the 1G. The 2G swap is the same whether it's a Spyder or GS-T.....or Avenger