This is the optional Tekno RC is proud to announce a redesigned rear gearbox option for the EB48 and SCT410 (TKR5016B). This gearbox is slightly angled upward to minimize the drive angles and increase efficiency. Furthermore, this helps to reduce wear on the driveshaft for increased longevity. This gearbox requires the use of larger 5x13x4mm pinion support bearings. This has been done to increase durability (TKRBB05134).