Description

The CUSCO Reinforced Transmission Clutch Hub Set for 1-2 & 3-4 Speeds is a targeted, heavy-duty internal gearbox upgrade designed to fortify the most vulnerable gears in the GR Yaris 6-speed manual transmission. Manufactured from high-strength chromoly steel, these hubs replace the stock synchronizer hubs for 1st-2nd and 3rd-4th gear pairs, providing critical reinforcement where failures are most common under high-load, high-RPM, and aggressive competition use.

Product Highlights

🏗️ Chromoly Steel Construction for Critical Gear Pairs
Specifically reinforces the 1st-2nd and 3rd-4th speed synchronizer hubs with components machined from high-strength chromoly steel. This material provides exceptional resistance to the shock loads, high torque, and stress concentrations that frequently cause failure in these lower gears during launches, hard acceleration, and competitive shifting.

⚙️ Targeted Reinforcement for High-Failure Components
Focuses on the gear sets that endure the most abuse: 1st gear for launches, 2nd and 3rd for hard acceleration and corner exits. This set provides a strategic and cost-effective reinforcement solution compared to replacing all three hubs.

🔧 Direct OEM Replacement – No Modification Required
Engineered to exact OEM dimensions as a direct, drop-in replacement for the factory 1-2 and 3-4 clutch hubs. Installation requires full transmission disassembly by a specialist but no modification to the gearbox casing or other internals.

🏁 Engineered for Competition & High-Stress Environments
This product is intended for competition vehicles (Time Attack, Rally, Circuit Racing, Drag) or high-powered builds where failures in the lower gears are a known risk. It is a preventative measure to ensure transmission reliability under extreme conditions.

⚠️ Competition Use Only – No Warranty
This product is for competition use only and is not covered by warranty. Its application is for environments where the failure of stock components is anticipated, and it is not recommended for standard street use.

Technical Specifications

• Product: Reinforced Transmission Clutch Hub (Synchronizer Hub) Set

• Material: Chromoly Steel

• Contents: Hubs for 1-2 Speed and 3-4 Speed (Set of 2)

• Application: Direct OEM replacement for specified gear pairs

• Use: Competition only

• Warranty: None (Competition part)

Kit Information

• Product Code: 1C7-028-CA

• JAN Code: 4996338085788

Installation & Critical Usage Notes

🔧 Expert Transmission Rebuild Required
Installation is a highly specialized procedure that must be performed by a certified transmission builder or race shop. It necessitates complete disassembly of the transmission, precise measurement of gear clearances, and expert reassembly.

⚙️ Supporting Parts & Fluids
Installation typically requires new genuine synchronizer rings, bearings, seals, and gaskets for the affected gear sets. Use of a high-performance racing transmission fluid is mandatory.

🎯 Strategic Upgrade for Common Failure Points
This set is the ideal solution for competitors focusing on strengthening the transmission where it matters most, providing a balance between comprehensive protection and cost for serious performance applications.