I have my 2000 chevy silverado 1500 in the shop for a transmission rebuild. It has a 5.3L V8 and 4 wheel drive. Since I haul mowers everyday, I was wondering if there are upgrades or kits that would help extend the life of the transmission, to help pull the weight and maybe help with fuel economy. I was looking online and found a trans go kit, transmission cooler and there were a few other things. Have you ever upgraded your transmission/engine or anything else to help haul and prevent damage to anything on the truck? What would you recommend I add to the truck?