This is an optional HPI HD Mod 1, 18/23 Tooth Drive Gear, and is intended for use with the HPI Savage Flux Monster Trucks, as well as the Savage X, Savage X SS and Savage X 4.6 trucks. This will also fit older Savages with 2 speed transmissions. This HD Drive Gear is a direct high performance upgrade for the HPI86097 Drive Gear. It is made from tough machine cut steel for improved durability compared to the stock part.
NOTE: This part is not compatible with 3 speed transmissions.