the switch in the transfercase is a 2 prong the conector on the trans is a 3 prongI think the 4l80 is from a 99 but I am not sure.It has the different harness on it.Gm parts guy is telling me if I get the 3 prong that I need to wire a push button in the dash.the transfer case is the original from 1994.need help guy wants to buy the truck but I can't get the switch to get 4x4 to work