Hi Doc, The axle ratio for this unit is 6.14 single axle MD3060 trans 5 speed tyre size is 11r x 22.5 Gross veh weight 35000lbs torque 860ft @ 1400. Ran the 0- 50 mph in 22secs not fully loaded as this unit is brand new built by Superior Emergency out of Red D... Login to read more.