Subaru OEM Transmission Main Shaft | 32201AB170

Overview

The Genuine Subaru OEM Transmission Main Shaft (Part #32201AB170) is a factory-original internal transmission component engineered specifically for the 2007–2021 Subaru STI and the 2015–2021 Subaru WRX. As a critical drivetrain element within the STI's renowned 6-speed close-ratio manual gearbox, this main shaft ensures precise power transfer, smooth gear engagement, and long-term reliability that only a genuine OEM part can deliver. Whether you're rebuilding a high-mileage gearbox or replacing a worn shaft after track use, this is the exact part Subaru installs at the factory.

Key Features & Benefits

• Genuine Subaru OEM Quality — Manufactured to factory specifications, ensuring a perfect fit and function with no modifications required.
• Exact-Fit Guarantee — Engineered exclusively for the STI and WRX 6-speed transmissions; eliminates the guesswork of aftermarket compatibility.
• Factory-Grade Materials — Produced from the same high-strength alloy steel used in original Subaru production, providing durability under high-torque and high-RPM demands.
• Preserves Transmission Integrity — Restores OEM gear mesh geometry and bearing alignment, protecting surrounding transmission components from accelerated wear.
• Factory Warranty Eligible — As a genuine Subaru part, it is backed by Subaru's OEM parts warranty when installed by an authorized facility.
• Direct Replacement — Matches OEM dimensions exactly, making installation straightforward for experienced transmission technicians.

What's Included

• 1x Genuine Subaru Transmission Main Shaft — Part #32201AB170

Specifications

Fitment & Compatibility

This genuine Subaru main shaft is designed to fit the following vehicles:

2007-2021 Subaru STI

2015-2021 Subaru WRX

Note: Always verify your specific year, model, and transmission code against part #32201AB170 before ordering. This part is intended for the 6-speed manual transmission applications listed above.

Installation

Installation of a transmission main shaft requires full transmission disassembly and is not a DIY-friendly procedure. This part should be installed by a qualified transmission specialist or Subaru-certified technician with proper tools including a press, bearing pullers, and torque wrenches. Always replace associated bearings, seals, and snap rings during a transmission rebuild to ensure long-term reliability. Refer to the Subaru STI factory service manual for detailed specifications and torque values.