Bill,
Yup. 14 and she rides like a dream. Well, compared to having no movement at all when the shackles were mounted upside down!!! It's like going from a hard tail to a soft tail Harley. Shackle kit was correct for this year. 10 is correct and I'm glad I went with the 14 'cause it would have ridden even lower with 10 and I wanted more load carrying capacity.
I knew someone was going to say that. The dump bed is pretty small and it's not very heavy. Alot of sheet metal. It has an enormous hydraulic cylinder relative to the size of the bed. It's not bad. There's a big set of rails that ride on top of the truck frame that were fabricated pretty well. However, the angle is such that the bed sits too low in the rear. Appears someone simply took the dump bed off another vehicle and installed it on this chasis without changing the angle of those rails. It's on there real good. Too much work to change it. I'd have to cut the box loose in the rear, fabricate new rails the length of the frame and mess with the geometry of the ram. I'd rather block up the whole frame atop the axle if that's possible.