Genuine HT spare/option part.These heavy duty differential drive cups for front or rear differential in a Losi 5ive-T/B or MINI WRC are made of 300M / Böhler V132 steel and are characterized not only by high hardness, but also simultaneously toughness. The service life is therefore much higher than for the stock cups.300M steel is used in motorsport and aviation for high strength parts. As a highly pure material, it is significantly more expensive than conventional steels, its high basic strength and toughness make the machining a time-consuming task.The shape of these drive cups now allows the use of driveshaft boots and grease lubrication, which increases service life enormously. In addition, these HD drive cups have two sets of slots for the pin of the drive shaft, this means another doubling of the service life.We recommend y0809 Klüber grease for lubrication of closed HD drive cups.A dry run like with stock parts is theoretically possible, but absolutely not recommended because it would waive the enormous advantage of encapsulated lubrication and the associated wear reduction. The set for the rear includes modified stock alloy bearing carriers, which provide improved clearance for the driveshaft boots.You can find advices for installation at the specifications-tab.Contents:Front set:2 pieces of 300M steel HD differential drive cup, front and rear application2 pieces of driveshaft bootsRear set:2 pieces of 300M steel HD differential drive cup, front and rear application1 pair of modified bearing carriers2 pieces of driveshaft boots