That's gonna be a tough one. Could be pcm. Could be wiring harness. Somebody is gonna have to chase that one. I had something else on my mind with the cluster but it couldn't be that with these trucks.
IIRC there isn't enough room in the 08+ fenders on the front to do cut out flares. I don't think they even make them. If you go back to 99-07 they will work with an 8" lift and clear 40s
Trans is talking a chit. Last time over the pass it didn't like life but drives in town good. I'm not sure on the starting issue. Truck is a buddies. I told him I would look at it but he doesn't have the money to fix it. No bed is on the truck. Welder and box are sold.
Have a 99 F350 extended cab long bed dually for sale. Automatic trans that is nearing end of life. Engine runs strong but sometimes doesn't want to start. Don't have money for the truck so our loss is your gain. Truck has no bed as the welding bed and welder came off for sale. 178K miles...
Have good core engine, zf6, Dana super 60, Dana 135. Also a ton of super duty parts. Ask and I probably have it. Chassis is a 99 F550. Body is 00 F250 extended cab. Lots of good body parts as well.