2-Speed Hi/Lo Transmission Components

2-speed Hi/Lo Transmission conversion kit for all 1/10 scale YETI transmissions.

What’s great about this “not so generic” 2-speed kit is that it comes with a full set (3) of heat treated hardened steel machined gears, plus an additional optional high speed gear (Hi Gear Option), full set of cartridge bearings, two different servo mounting options (micro or standard), servo saver system and all necessary hardware to complete the installation. Gearing wise, first gear ends up a being a 2:1 reduction intended for slow technical crawls while the Hi Gear (28T) gear is based off the stock 1.08:1 ratio and Hi Gear Option (26T) increases top speed with a 0.93:1 ratio. Shifting between the gears can be done on the fly while driving from the convenience of your radio. This system does require the use of radio system that features a 3rd channel for operation.

Knowing the harsh environments this system is intended for; the goal was to produce a gear set strong enough to take on anything thrown at it. This lead to developing a steel gear set that has been hardened, heat-treated and machined to tight tolerances for optimum performance. The 2-speed gear slider features the same treatment as the gears along with having four-tooth engagement design for accurate and rapid gears shifts on the fly.

Supplied in the 2-speed kit is a full set of cartridge bearings (6), which is great because while you’ve got the transmission apart it makes for a great rebuild opportunity.


Actuating the gear shifting can be done with either micro or standard sized servos thanks to the multiple mounts offered in the kit. It’s suggested to use a servo that features at least 80oz/in of torque to properly complete the shift. The kit features a servo saver design for increased servo longevity and two different servo horns (one long, one short) depending on servo used along with three inserts (23T, 24T, 25T) accommodating for various servo spline counts.

Within the package all necessary hardware needed to complete the installation of the 2-Speed conversion into your YETI ™ transmission is supplied, including the servo mounting screws.

• Heat treated, hardened, and machine cut gears (18T, 28T, 26T, 36T, slider)
• Full set of transmission cartridge bearings (AXA1221 and AXA1218)
• All necessary hardware (AXA146, AXA0145, AXA116, AXA0147, AXA0109, AX31073)
• Servo saver system, w/ two servo horns, three spline adapters (AX31009)
• Servo mounting brackets (micro and standard)
• Lo Gear ratio: 2:1
• Hi Gear ratio: 1.08:1
• Hi Gear Option ratio: 0.93:1