The Fonzon FZCSGRR01 ARRMA Grom Rear Differential and Pinion Set is a fully assembled rear drivetrain upgrade designed for compatible ARRMA Grom vehicles needing stronger gearing, smoother power transfer, and improved durability under high-load driving. Features Fully Assembled Rear Diff Set: Supplied factory assembled with rear differential and input pinion for faster installation 7075-T6 Aluminium Case: Lightweight aluminium differential case provides a strong housing with an excellent strength-to-weight ratio Steel And Powder Metallurgy Gears: CNC-machined nickel-chromium alloy steel and powder metallurgy gears support durable power transfer Heavy-Duty Gear Design: Drive bevel, planetary, and ring gears are designed to handle increased torque and demanding terrain Pre-Filled Diff Oil: Supplied filled with 3K cSt silicone differential oil for smooth and consistent operation Sealed Adapter Cup Bearings: High-quality sealed bearings help support efficient drivetrain rotation Grade 12.9 Screws: Titanium-coated screws provide strong and corrosion-resistant assembly hardware Grom Drivetrain Upgrade: Suitable for strengthening the rear differential assembly on compatible ARRMA Grom models Specifications Brand: Fonzon Part Number: FZCSGRR01 Product Type: Rear differential and input pinion set Application: Rear differential upgrade for compatible ARRMA Grom vehicles Diff Oil: 3K cSt silicone oil Case Material: 7075-T6 aluminium Gear Material: Steel and powder metallurgy Gear Type: Drive bevel, planetary, and ring gears Bearings: Sealed adapter cup bearings Hardware: Grade 12.9 titanium-coated screws Assembly: Fully assembled and ready to install Compatibility ARRMA Gorgon Grom ARRMA Granite Grom ARRMA Mojave Grom ARRMA Quake Grom ARRMA Typhon Grom Includes 1 x Fonzon ARRMA Grom 7075-T6 aluminium assembled rear differential and pinion set with steel gears FAQ Is the Fonzon FZCSGRR01 differential already assembled? Yes. The Fonzon FZCSGRR01 rear differential and pinion set is supplied fully assembled and ready to install. What diff oil is included in the Fonzon FZCSGRR01? The Fonzon FZCSGRR01 differential is pre-filled with 3K cSt silicone differential oil. What ARRMA vehicles does this rear differential suit? The Fonzon FZCSGRR01 rear differential is designed for compatible ARRMA Grom vehicles, including Gorgon Grom, Granite Grom, Mojave Grom, Quake Grom, and Typhon Grom models. Is this a genuine ARRMA part? No. The Fonzon FZCSGRR01 is an aftermarket drivetrain upgrade made by Fonzon for compatible ARRMA Grom vehicles. Does this include the input pinion? Yes. The Fonzon FZCSGRR01 set includes the rear differential assembly with input pinion. Important Notes This is an aftermarket Fonzon upgrade part, not a genuine ARRMA factory spare part. Check your ARRMA Grom manual, exploded diagram, and drivetrain layout before fitting to confirm rear differential compatibility. This listing is for the rear differential and pinion set only. Vehicle, diff housing hardware outside the supplied assembly, tools, and other drivetrain parts are not included. After installation, check gear mesh, drivetrain movement, and screw tension before running the vehicle.
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