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I have a 92 Chevy K2500 Silverado that is my Feed Truck. It’s not a nickname like other people call their 12 valves a Street Tractor or Farm Truck, this is the truck is use in the winter time to feed and transport hay and grain for my animals. My dad bought it and made a flatbed out of diamond plate steal and flat bar then made a homemade bale spear on the back. Then it has a cake feeder on it as well with the electric over hydraulic pump for the bale spear under it. It was originally a 6.5 4l80e truck but the turbo failed, ate some oil, and the motor locked up. Dad swapped in a 6.2 out of a late 80s short bus and then mixed some of the parts onto the 6.2 from the 6.5. Like it has the newer belt system instead of the v belt it would have had on it. Then the 4l80e lost reverse so we never backed up with it for a couple years before it got rebuilt. Anyways the main reason for my post is I’m planning on putting a new motor in it. The old 6.2 is tired and has no power (shocker) but somehow has less power than it did years ago. It’s never seen starting fluid or anything and doesn’t have blow by but anymore if I haul a hay bale with it (1400lbs -1800 lbs) I can’t go any fast than 30-40 and the whole reason for the truck is to haul bales. I’m looking to swap a 12 valve in it to make it simple and those 12 valves can take a beating too. I know swap parts like motor mounts, backing plate, flex plate, 6.4/6.0 starter, and intercooler are needed but I would like to keep the 4l80e. I don’t plan on hot-rodding it around and honestly, don’t plan on turning it up any. The 4l80e was already behind a 6.5 and 6.2 both having the db2 injection pumps. The motors were all mechical but the transmission in obviously electronically controlled and I have a obd1 port on the truck for the transmission. Figuring I basically already have a stand-alone computer because of that, does anyone know what sensors or what would have to be done to use the 4l80e behind a 12 valve? I don’t really want to “just buy a controller, it’s easier” as I would trip over a quarter to pick up a penny but would make brackets or whatever myself and make it work together but I just don’t know transmissions that well. Besides that, the swap seems straight forward and easy as it won’t have A/C on it and I can adapter power steering lines pretty easy then will use the dodge alternator unless I can use a Chevy 1 wire alternator. I guess if there is anything I’m over looking or not thinking about, please let me know. This is my first time using this website but have been watching Deboss Garage for years and where I’m finally getting plans together, thought this is the place to post this looking for help/advice. If I’m using this wrong or if there is a different place to post this, let me know.