2004 Chevrolet Silverado 4 8l 4l60e That Swapping 2003 Lq4 6 0l Into Tranny On

I have a 2004 silverado 4.8L/4l60E that I am swapping a 2003 lq4 6.0L into...my tranny has one large rectangle plug by the PRND lever and the harness that came on my lq4 has two smaller rectangle plugs for this lever...how do I make this new harness work I need to find a way to make the harness that came with the motor i purchased work with the transmission I already have in my truck