Method RC Fonzon 39/12T Full Metal Split Fr/Rr Diff - Arrma 8S Series

The Method RC Fonzon 39/12T Full Metal Split Front/Rear Differential for ARRMA 8S Series (part FZCS83912T) is engineered for brute power and precise control on large-scale terrain. Built to withstand extreme torque and repeated impacts, it delivers smooth, consistent drive with long-term durability.

Its fully CNC-machined 4340 nickel-chromium alloy steel internals use a helical gear profile for quieter, smoother engagement under load. A rigid 7075-T6 aluminium diff case keeps everything aligned, while grade 12.9 screws and matched drive cup bearings support reliable, efficient rotation. Factory pre-filled with 100K cSt differential oil and supplied fully assembled, it offers easy, drop-in installation.

Features

• All gears CNC-machined from nickel-chromium alloy steel (4340) for maximum strength.
• Helical gear design for smoother engagement and quieter operation under load.
• Metal diff case (centre housing) crafted from 7075-T6 aluminium alloy for high rigidity with reduced weight.
• Grade 12.9 corrosion-resistant screws for long-lasting assembly integrity.
• High-quality matched drive cup bearings for stable, efficient rotation.
• Factory pre-filled with 100K cSt differential oil.
• Fully assembled and ready to install – no setup required.

Suggested Compatibility

ARRMA 8S platform models, including:

• Kraton 8S
• Outcast 8S
• EXB Series 8S Models