Steve, Oldmanmopar is right, "real trucks don't have sparkplugs"

The only upgrade the truck can really use is the 3rd gen front disc rotors and caliper hangers. But then u need to run 17 inch rims and tires. If u have discs on the rear ur golden, but I believe urs has drum brakes which u can swap in Chevy size wheel cylinders to help the rear brakes out. There is a blend door fix that is metal, not the cheap plastic. I’ll see if I can find what it is and where it’s from. A great site for our trucks is TDR, I believe it’s Turbo Diesel Resources. Kim