The Fonzon 37/13T Full Metal Differential is a heavy-duty front or rear drivetrain upgrade for compatible Arrma 1/10 4X4 vehicles, combining CNC-machined steel helical gears with a 7075-T6 aluminium housing for improved durability and smooth power transfer. Features Universal Front or Rear Fitment: One differential can be installed in either compatible front or rear differential positions 37/13T Gearing: Provides a 2.85:1 differential gear ratio with an emphasis on torque and controllable power delivery CNC-Machined Gears: Gears are manufactured from nickel-chromium alloy steel for drivetrain durability 4340 Steel Construction: High-strength steel is used for the differential gearing Helical Gear Design: Provides smooth and quiet gear engagement under load 7075-T6 Aluminium Housing: Metal centre housing combines rigidity with relatively low weight Steel Drive Cups: Nickel-chromium alloy steel drive cups provide additional drivetrain strength 100K cSt Differential Oil: Factory pre-filled for convenient installation Sealed Bearings: Adapter cup bearings support smooth differential operation Grade 12.9 Hardware: Gold-coloured titanium-coated screws provide corrosion resistance Factory Assembled: Supplied assembled and ready for installation Designed for Demanding RC Use: Suitable for bashing, trail driving and higher-load Arrma 1/10 4X4 applications Specifications Brand: Fonzon Manufacturer Part Number: FZCS43713 UPC: 195286010871 Product Type: Front / Rear Differential Upgrade Scale: 1/10 Compatibility Platform: Arrma 1/10 4X4 Installation Position: Front or Rear Ring Gear: 37T Drive Bevel Gear: 13T Gear Ratio: 2.85:1 Gear Design: Helical Gear Material: CNC-Machined Nickel-Chromium Alloy Steel Steel Grade: 4340 Differential Housing: 7075-T6 Aluminium Alloy Drive Cup Material: Nickel-Chromium Alloy Steel Differential Oil: 100K cSt Hardware: Grade 12.9 Titanium-Coated Screws Assembly: Factory Assembled Compatibility Arrma Granite 4X4 Arrma Senton 4X4 Arrma Big Rock 4X4 Arrma Typhon 4X4 Arrma Vorteks 4X4 Includes 1 × Fonzon 37T Universal Front / Rear Differential Assembly 1 × Fonzon 13T Universal Drive Bevel Gear FAQ Does FZCS43713 include both a front and rear differential? No. FZCS43713 includes one universal differential assembly and one matching drive bevel gear. The differential is designed to suit either the front or rear position on compatible Arrma 1/10 4X4 vehicles. What Arrma vehicles does the Fonzon FZCS43713 differential fit? Fonzon lists the Granite 4X4, Senton 4X4, Big Rock 4X4, Typhon 4X4 and Vorteks 4X4 as compatible models. What is the difference between the Fonzon 37/13T and 34/14T versions? The 37/13T version has a 2.85:1 ratio and is intended to favour torque, controllability and reduced drivetrain load compared with the 34/14T 2.43:1 version, which is more speed-focused. Does the differential need to be assembled or filled with oil? No. FZCS43713 is supplied fully assembled and factory-filled with 100K cSt differential oil, making it ready for installation. Important Notes One FZCS43713 package contains one differential assembly, not separate front and rear differential assemblies The differential can be used in either the front or rear position on compatible vehicles Uses 37T / 13T gearing with a 2.85:1 ratio Do not mix differential and input gear ratios unless the vehicle setup specifically supports the combination Check your exact Arrma model and existing drivetrain configuration before installation
