Well, sometimes we don’t get to tow with what we want, so we have to tow with what we have. I am looking to pull the ECU out of a junkyard 2002 Chevy Express 1500 with 3.73 rear end and swap it into my 99 C1500 Suburban in order to gain a tow/haul mode. I mention the gearing because I am also swapping out the rear end to that ratio from a 3.42. After this and some easy brake and suspension upgrades, I intend to use this truck to tow a 7000# camper until I can afford the 1-ton passenger van that will replace it in a couple of years. I’m hoping somebody in here has done this swap and gained some knowledge that they would be willing to share.