Replace the internal components of your differential with one of these mini-spools from Richmond Gear, who have been supplying racers for more than 80 years. Richmond minis lock your axles together for even power distribution to both driven wheels. They're CAD/CAM-designed, CNC-machined from 4140 alloy-steel forgings, and heat-treated to aircraft standards. Mini spools are recommended for dirt track use only.
