This is an optional HPI Hardened Differential Gear ...
Set. These hardened diff gears dramatically increase the durability and lifespan of the diffs in your HPI Trophy buggy or truggy. Package includes the gears and washers needed to upgrade one differential. ...
from sintered steel with updated tooth proflie for lower rolling resistance. Will also fit the Jumpshot V1 & V2 when used with the corresponding differental parts. The following gears must also be ...