if you have the 6 speed then this pan works I put it on mine very happy with it, even though it was out of stock when I was ordering it for about 3 1/2 months, there in stock now though
http://www.bmracing.com/products/70295-cast-deep-transmission-pan-for-gm-4l80e-transmission/
http://www.bmracing.com/products/70295-cast-deep-transmission-pan-for-gm-4l80e-transmission/