to convert ur gp to rwd u need a wrecken f body car rear end driveline and crossmember then just need to do some fab work for them to work id try to find a maro with a ls1
01 GTP is3 cam 130 springs double roller 60lb injectors lq4 maf headers 4000 stall lowered sold 97 GTP stock Sold 2001 gp gt ssm90 plog dp 3.8 208 whp 265 at the crank 14.8 1/4