Not sure how much higher the earlier pumps are mounted. Maybe 2".
Careful when experimenting with pulley diameters and fan speed.
Too fast and you get pump cavitation, bubbles and overheating.
You can also drop the radiator down by drilling new mounting holes in the radiator brackets about 1" above the original ones.
My radiator has a taller core, so it looks like original after the mod.
Don't know if the taller rad came 3/4 or 1 ton trucks, but is' a perfect fit on the 1/2 ton.
Also replaced my old inefficient fan with a 18" low-profile flex-fan.
