well, that's what I need to determine as well, if the 6.2 clutch disc and pressure plate will mount to the 6.5 flywheel, I think it will, as the later 6.2 blocks with the one-piece rear main seal, used the same flywheel, but-and I need to double check- I think the 6.2 went one-piece in 88, so I guess I would need to use a 1988-1991 1 ton, with a 4-speed.
I was just really hoping to save a little money, the "kits" for the flywheels and clutch components is cheaper then piecing together