Fonzon ARRMA 6S 7075-T6 Aluminium 41T Assembled Centre Differential Steel Gear FZCSZ641

The Fonzon ARRMA 6S 7075-T6 Aluminium Assembled Centre Differential is a heavy-duty drivetrain upgrade designed for high-performance ARRMA 6S RC vehicles. Combining a precision-machined 7075-T6 aluminium differential case with tough nickel-chromium alloy steel and powder-metallurgy gears, this fully assembled 41T centre differential is engineered to handle the high torque and demanding impacts associated with powerful 6S setups.

Supplied factory assembled and pre-filled with 10K cSt differential oil, the FZCSZ641 is designed for straightforward installation with minimal preparation. An extended nickel-chromium alloy steel drive cup, sealed bearings and Grade 12.9 titanium-coated hardware complete a durable package designed to provide smooth, consistent power transfer in demanding bashing and off-road applications.

Features

• Heavy-duty assembled centre differential for compatible ARRMA 6S vehicles
• 41-tooth steel centre gear
• CNC-machined nickel-chromium alloy steel components for increased strength
• Powder-metallurgy drive bevel, planetary and ring gears for durability
• 7075-T6 aluminium differential case provides an excellent strength-to-weight ratio
• Designed to withstand high torque from powerful 6S brushless systems
• Pre-filled with 10K cSt differential oil
• Extended nickel-chromium alloy steel drive cup with +1.5mm length
• High-quality sealed adapter cup bearings for smooth operation
• Grade 12.9 titanium-coated screws provide excellent strength and corrosion resistance
• Fully factory assembled for convenient installation
• Designed for hard bashing and demanding off-road use

Specifications

• Brand: Fonzon
• Manufacturer Part Number: FZCSZ641
• Product Type: Assembled Centre Differential
• Application: ARRMA 6S RC Vehicles
• Centre Gear: 41T
• Differential Case Material: 7075-T6 Aluminium Alloy
• Gear Material: Nickel-Chromium Alloy Steel / Powder Metallurgy Steel
• Differential Oil: 10K cSt, Pre-Filled
• Drive Cup Material: Nickel-Chromium Alloy Steel
• Drive Cup: Extended +1.5mm
• Bearings: Sealed Adapter Cup Bearings
• Hardware: Grade 12.9 Titanium-Coated Screws
• Assembly: Factory Assembled

Compatibility

• ARRMA Kraton 6S BLX
• ARRMA Typhon 6S BLX

Includes

• 1 × Fonzon ARRMA 6S 7075-T6 Aluminium Assembled Centre Differential
• 1 × 41T Steel Centre Gear
• Pre-installed internal gears, drive cups, bearings and hardware
• Pre-filled 10K cSt differential oil

FAQ

What is the advantage of the 7075-T6 aluminium differential case? 7075-T6 aluminium provides excellent strength and rigidity while remaining relatively lightweight. Compared with a plastic differential case, the metal construction is intended to better resist deformation under high drivetrain loads.

Is this differential already assembled? Yes. The FZCSZ641 is supplied fully factory assembled, including the internal gears, drive cups, bearings and hardware.

Does it already contain differential oil? Yes. It is supplied pre-filled with 10K cSt differential oil, allowing it to be installed without initially filling the differential yourself.

Can I change the differential oil? Yes. Experienced users can change the oil to alter centre differential behaviour. Thicker fluid generally transfers power more aggressively between the front and rear drivetrains, while thinner fluid allows greater differential action. The ideal viscosity depends on your vehicle, tyres, terrain and driving style.

What does the 41T specification mean? The centre differential is equipped with a 41-tooth centre gear. Gear tooth count is an important compatibility specification, so confirm that 41T is correct for your specific vehicle and drivetrain configuration before installation.

Will it fit every ARRMA 6S model? Compatibility supplied for this product specifically lists the ARRMA Kraton 6S BLX and Typhon 6S BLX. Fitment on other ARRMA 6S vehicles should be confirmed before ordering rather than assumed.

Why upgrade to a full-metal centre differential? A metal differential case and strengthened gear set are designed to better tolerate high torque, powerful brushless systems, aggressive acceleration and demanding bashing conditions where drivetrain components experience substantial loads.

Do I still need to check the differential before running? Yes. Even though the assembly arrives ready to install, it is good practice to check bearing seating, fastener security, gear mesh and drivetrain movement after installation before applying full power.

Important Notes

• Confirm 41T centre gear compatibility with your specific ARRMA model and version before purchase.
• Compatibility supplied for this part lists ARRMA Kraton 6S BLX and ARRMA Typhon 6S BLX.
• Do not assume compatibility with every ARRMA 6S vehicle or model revision.
• Differential is supplied pre-filled with 10K cSt oil.
• Check centre gear and motor pinion mesh carefully after installation.
• Incorrect gear mesh can cause excessive noise, heat and premature gear wear.
• Rotate the drivetrain by hand after installation to confirm smooth operation before powering the vehicle.
• Recheck mounting hardware and drivetrain condition after the first few runs.
• Different differential oil viscosities can significantly change vehicle handling and drivetrain behaviour.
• Vehicle, motor, chassis and other drivetrain components are not included.