Subaru OEM Gear Complete-6TH Drive Subaru STI 2004-2021 / WRX 2019-2021 | 32337AA020

Overview

The Genuine Subaru OEM Gear Complete-6TH Drive (Part #32337AA020) is a factory-original transmission component engineered for 2004–2021 Subaru STI and 2019–2021 Subaru WRX models. Designed to exact OEM specifications, this driven gear ensures proper gear mesh, smooth power transfer, and long-term drivetrain reliability — critical for both street driving and performance applications. If you're rebuilding or repairing your STI's 6-speed manual transmission, this is the only gear that guarantees a true factory fit.

Key Features & Benefits

• Genuine Subaru OEM Part — Manufactured to factory specifications for a guaranteed exact fit and function, with no guesswork or adaptation required.
• Precision-Cut Gear Teeth — Factory gear geometry ensures proper mesh with the 6th gear drive gear, delivering smooth engagement and reduced wear over time.
• Durable OEM-Grade Materials — Built from the same high-strength alloy steel Subaru uses on the production line, rated for the torque demands of the EJ257 and FA20DIT engines.
• Direct Replacement — Drops directly into the 6-speed close-ratio transmission (TY856WB6CA and compatible variants) found in STI models and in the 2019–2021 WRX, no machining or modification needed.
• Factory Warranty Backed — Covered under Subaru's genuine parts warranty when installed by an authorized dealer.
• OEM Part Number Cross-Reference — Part #32337AA020 matches the original factory specification, making sourcing and verification straightforward.

What's Included

• 1x Genuine Subaru Gear Complete-6TH Drive — Part #32337AA020

Specifications

Fitment & Compatibility

Product Fitment:

• 2004-2021 Subaru STI
• 2019-2021 Subaru WRX

Always verify fitment using your vehicle's VIN and transmission code before ordering. This part is for the 6-speed manual transmission; it is not compatible with 5-speed or automatic variants.

Installation

Installation of the Gear Complete-6TH Drive requires full disassembly of the 6-speed manual transmission and is considered an advanced repair. Professional installation by a qualified Subaru technician or experienced transmission specialist is strongly recommended. Proper torque specs, bearing preload settings, and snap ring fitment must be followed per the Subaru transmission service manual to ensure safe and reliable operation after reassembly.