ARRMA CNC Metal Crown Gear 37T BLX 3S RC Car Part AR310885

Overview

The ARRMA CNC Metal Crown Gear 37T for BLX 3S is a precision-engineered transmission component designed for ARRMA's range of 3S and 4S brushless RC vehicles. This high-quality metal crown gear is an essential replacement part for enthusiasts and racers who demand reliability and performance from their RC car UK setups. Whether you're running a ready to run RC monster truck, brushless RC buggy, or stadium truck from ARRMA's extensive lineup, this crown gear delivers the durability and precision fit you need to keep your vehicle performing at its best.

Built using CNC (Computer Numerical Control) manufacturing processes, this crown gear represents the pinnacle of production quality in the RC hobby. The 37-tooth configuration is specifically calibrated for use with ARRMA's BLX brushless transmission systems, ensuring perfect mesh with compatible pinion gears and delivering smooth, efficient power transfer from motor to wheels. This is not a generic aftermarket part — it's an OEM specification component that maintains the exact tolerances and performance characteristics ARRMA engineers designed into your vehicle from the factory.

If you're experiencing wear on your existing transmission, looking to refresh your RC car setup, or building a competition-grade vehicle, this CNC metal crown gear is the authentic replacement part trusted by RC enthusiasts across the UK. Its precision manufacture ensures that your brushless RC 3S and 4S vehicles continue to deliver the performance, speed, and reliability you expect from premium ARRMA equipment.

Key Features

• CNC Precision Manufacturing — This crown gear is manufactured using computer-controlled CNC machinery, which ensures every tooth is cut to exact specifications with minimal tolerance variation, delivering superior mesh quality and efficiency compared to injection-moulded alternatives.
• High-Quality Metal Construction — The use of precision metal materials provides exceptional durability and resistance to wear, making this component ideal for frequent racing, competition use, and high-performance bashers who demand longevity from their transmission components.
• 37-Tooth Configuration — The 37-tooth count is specifically engineered for ARRMA's BLX brushless transmission systems, ensuring perfect engagement with compatible input gears and maintaining the correct final drive ratio for balanced acceleration and top speed.
• OEM Specification Component — As an official ARRMA part (AR310885), this crown gear meets all factory engineering standards and specifications, guaranteeing compatibility and performance that matches the original equipment your vehicle was designed with.
• Compatible with Multiple ARRMA Models — This single component fits across a wide range of ARRMA 3S and 4S brushless vehicles, including Big Rock, Granite, Kraton, Outcast, Senton, Vorteks, Infraction, Mojave, Typhon, and Vendetta models, making it a versatile spare part for multi-vehicle collectors.
• Direct Replacement Design — As a manufacturer-approved part, installation requires no modification or adjustment to your RC vehicle, simply removing the worn gear and pressing in this precision component for immediate restored performance.

Technical Performance

The ARRMA CNC Metal Crown Gear 37T represents the transmission engineering that goes into every ARRMA brushless RC vehicle. The CNC manufacturing process cuts each tooth with precision tolerances, eliminating the slight imperfections found in injection-moulded plastic gears and ensuring consistent, smooth power delivery across all driving conditions. Metal construction provides superior wear resistance compared to standard composite gears, meaning this component will maintain its precision even under sustained high-load racing or aggressive bashing. The 37-tooth specification is engineered to work in precise harmony with the 13-tooth input gear (AR310886) and composite differential case (AR310772), creating a transmission system optimised for the 3S and 4S LiPo battery performance envelope that ARRMA's brushless motors are designed around. Whether you're running a 3S 775 brushless motor (as found in many ARRMA RTR models) or upgraded to 4S power, this crown gear maintains the correct gearing ratios for optimal acceleration, top speed, and efficiency. The metal construction also dissipates heat more effectively than plastic alternatives, keeping the transmission cooler during extended running sessions and prolonging overall component lifespan. For UK-based RC enthusiasts running any of the compatible ARRMA brushless models — from the Big Rock monster truck to the Typhon buggy — this crown gear delivers the OEM-specification performance and durability that serious racers and bashers depend on.

What's in the Box

• 1 x CNC Metal Crown Gear 37T (AR310885)

What You Need to Complete

• AR310886 — CNC Metal Input Gear 13T (required for complete transmission assembly)
• AR310772 — Composite Differential Case (required for complete transmission assembly)

Compatibility Guide

This crown gear is a standard parts fit for the following ARRMA 1/10 and 1/8 scale models: 1/10 Big Rock 3S 4x4 RTR Brushless Monster Truck (ARA4312V3, ARA102723, ARA102711), 1/10 Granite 3S 4x4 RTR Brushless Monster Truck (ARA102720, ARA4302V3, ARA102666), 1/10 Granite 4x4 RTR Brushed Monster Truck (ARA4202XV3, ARA4202V3), 1/10 Granite Boost 2WD RTR Brushed Monster Truck (ARA4102V4, ARA4102SV4), 1/10 Kraton 4S 4x4 RTR Brushless Speed Truck (ARA4408V2, ARA102690), 1/10 Outcast 4S 4x4 RTR Brushless Stunt Truck (ARA4410V2, ARA102692), 1/10 Senton 3S 4x4 RTR Brushless Short Course Truck (ARA102721, ARA4303V3, ARA102668), 1/10 Senton 4x4 RTR Brushed Short Course Truck (ARA4203XV3, ARA4203V3), 1/10 Senton Boost 2WD RTR Brushed Short Course Truck (ARA4103V4, ARA4103SV4), 1/10 Vorteks 3S 4x4 RTR Brushless Stadium Truck (ARA4305V3), 1/10 Vorteks Boost 2WD RTR Brushed Stadium Truck (ARA4105V4, ARA4105SV4), 1/8 Infraction 3S 4x4 RTR Brushless All-Road Street Bash (ARA4315V3), 1/8 Infraction 4x4 RTR Brushed All-Road Street Bash (ARA4215V3), 1/8 Mojave 4S 4x4 RTR Brushless Desert Truck (ARA4404), 1/8 Typhon 3S 4x4 RTR Brushless Buggy (ARA102696, ARA102722, ARA4306V3), 1/8 Typhon 4x4 RTR Brushed Buggy (ARA4206V3), and 1/8 Vendetta 3S 4x4 RTR Brushless All-Road Street Bash (ARA4319V3).

Frequently Asked Questions

• What does a crown gear do in an RC transmission? — The crown gear (also called a ring gear) is a key component in RC vehicle transmissions that meshes with the input pinion gear and transfers rotational force to the differential assembly. It effectively reduces speed while increasing torque, creating the final drive ratio that determines your vehicle's acceleration and top speed characteristics. In ARRMA's brushless systems, the crown gear works in concert with the input gear to optimise performance across the entire 3S and 4S LiPo power range.
• Why should I choose a metal crown gear over plastic? — Metal crown gears offer significantly superior durability compared to plastic composite alternatives. They resist wear more effectively, maintain precise tooth geometry even under high-load racing conditions, dissipate heat more efficiently, and typically last considerably longer before requiring replacement. If you're a competitive racer or frequent basher, a metal crown gear represents a worthwhile investment in transmission longevity and consistent performance.
• Is this crown gear suitable for both 3S and 4S LiPo batteries? — Yes, this CNC Metal Crown Gear 37T is engineered to work with both 3S and 4S brushless systems in compatible ARRMA vehicles. The 37-tooth specification and metal construction provide the strength and durability needed for the higher torque demands of 4S power, whilst maintaining optimal gearing for 3S systems. Always verify your specific model's compatibility using the fitment list provided.
• How do I know if my crown gear needs replacement? — Signs of crown gear wear include: grinding or metallic noises during acceleration, hesitation or loss of power during hard driving, visible tooth wear or damage when inspecting the gear, and difficulty achieving consistent top speed. If you notice any of these symptoms in your ARRMA brushless RC vehicle, replacement with this genuine OEM part will restore transmission performance.
• Will this improve my RC car's performance? — This is a direct replacement component, not a performance upgrade. If you're installing it as a new part in a vehicle with a worn transmission, you'll experience restoration of original factory performance — smoother acceleration, more consistent power delivery, and elimination of any grinding or slipping noises. For performance modifications, you would need to change the tooth count (different gear ratios), which would require a different part number.
• What other parts do I need to complete a transmission assembly? — To complete a full transmission assembly, you'll require the CNC Metal Input Gear 13T (AR310886) and the Composite Differential Case (AR310772). These three components work together as an integrated system, and all three are necessary for proper function.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ARRMA CNC Metal Crown Gear 37T for BLX 3S – Part No. AR310885 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.