J Lucas You don't have 2-speed axle I take it,because ground speed is too fast. My 48 2-ton is one speed axle but spreads off 8000 lbs. of white rock just right. Are you limiting your tail gate to control the rate of rock leaving the bed ?? Should be able to squeeze it down to just a leak !! My tail gate has 2 4x12 inch horizontal slots that just puts rock right on the 2 paths of where your vehicles run. Or can chain the whole tail gate for full width metering.of course the size of rock is a factor. Now gotta watch that the bed doesn't over center,upend and damage your hoist. Might want to chain it till you see how it will act,lot of factors there !! Always remember a spreaderman NEVER scoops gravel LOL LOL. I've scooped...