I'm in the middle of swapping a 4.3 vortec, 4l60e, and a gm rear axle (all came out of a 01 GMC jimmy). When I can afford to I'll change the 4l60e to a nv3500. As of current I'm In the process of cutting the firewall and floor for the transmission and the only headache I have with it is...
www.vwvortex.com