This gear differential unit can be used to replace the kit-standard ball differential found in the DB-01 chassis and 511,502 chassis (items 58395 Durga and 58404 Baldre). It gives drivers another setting option to fine tune their off-road buggy to track conditions. The sealed gear unit differential can be fine tuned using different viscosity weight oils to control how fast or how slow you want the differential to behave. The higher viscosity the oil is the slower the differential is in movement. Compared to a standard ball differential, gear differentials require less maintenance cycles. The unit uses a 37T pulley as well as 12T and 20T bevel gears. In addition, Item 54311 TA06 Cross Shaft for Gear Differential Unit comes standard for greater durability. The Cup Joints included with this item are simultaneously available as Spare Parts (Item 51472).