This is for a set (1 left and 1 right) new style grave digger gear boxes. This is the perfect setup for the guy looking to get rid of those ancient stock gear boxes that are nearly impossible to find and move to a common wheel. This setup is patent pending and installs with no modifications on a stock grave digger frame. Gear boxes are modded to accommodate 12v-18v-24v power. They have steel main gears and upgraded bearings. 360rpm output gear at 24v and 270 at 18v. 
NOTE: if you are keeping the stock grave digger tires, you will need the Mansfield to grave digger adapters. Other adapters are also available for different tire setups. If you are unsure, send us a message!