I am trying to lift a load with a drill motor. I have a chain drive with a 3.7x1 ratio - 13 teeth on the drive gear with a 2.5" diameter and 48 teeth on the driven gear with a 7.75" diameter. It lifts the load easily. I also have a geared drive (no chain) with a 4.0x1 ratio - 16 teeth on the drive gear with a 1" diameter, and 64 teeth on the driven gear with a 4" diameter. The latter won't begin to lift the load. Whats wrong?