The SCX10 II stock axle gears are known to be a weak point in the housing. After releasing the popular Keyed 27/8T Overdrive Hardened Steel Gears, requests were sent in for underdrive gears. So YOU asked, and we listened! Here is the new heavy-duty underdrive 33/8T helical bevel gear & diff locker set. Designed for the AR44/AR45/Capra Currie F9 Axle Housing, Boom Racing AR44 PHAT Axle Housing or the BRX70/BRX80/BRX90 PHAT Axles.

Use this gear to improve the performance of your crawler. Run them in the rear axle for a slower wheel speed in the rear tyres. Underdrive gears help to steer in sharp turns like how a dig does and slower wheel speed in the back with higher torque output.

• Underdrive gears create slower wheel speed for rear wheels to help steering with higher torque output
• Hardened steel gears for maximum strength and durability
• Keyed spool to increase structural strength and to eliminate the weakness of the M2 screws
• Tight tolerance of the diff locker and the axle shaft
• Tight tolerance of the bevel gear and input shaft to increase efficiency in the drivetrain

• 2 x 7x14x3.5mm Bearings (#BBZ687OPEN)

• This product will only fit one axle housing.