Cusco 6A1 489 A Reinforced Rear Differential Mount for 08-21 Subaru

Vehicle Fitment

• 2008-2014 Subaru WRX STI (GV/GR, AWD)
• 2015-2021 Subaru WRX (VA, AWD)
• 2015-2021 Subaru WRX STI (VA, AWD)
• 2014-2018 Subaru Forester XT (SJ, AWD)
• 2013-2023 Subaru Crosstrek (GP/GJ, AWD)
• 2019-2024 Subaru Forester (SK, AWD)

Features

• Reinforced rear differential mount designed to reduce unwanted movement
• Box-type steel construction for increased chassis rigidity
• Pre-installed heavy-duty rubber bushings for improved durability
• Direct OE replacement bolt-on installation
• Helps maximize direct traction and drivetrain response
• Reduces differential carrier flex under heavy cornering
• Improves acceleration feel and rear stability
• Signature Cusco blue finish resists corrosion

Specifications

• Brand: Cusco
• Part Number: 6A1 489 A
• Position: Rear differential mount / carrier brace
• Material: Boxed high-strength steel
• Bushing Type: Heavy-duty rubber
• Finish: Blue powder coat
• Installation: Bolt-on replacement
• Drivetrain: AWD

Included Components

• 1x Cusco Reinforced Rear Differential Mount
• 1x Mounting hardware kit

Product Description

The Cusco 6A1 489 A Reinforced Rear Differential Mount strengthens the rear differential carrier on select Subaru AWD performance vehicles. Standard factory mounting points allow a degree of movement that can reduce traction and drivetrain efficiency under high load. This reinforced mount replaces the OEM unit with a boxed steel design and heavy-duty rubber bushings to reduce flex, improve traction response, and enhance vehicle stability during acceleration and cornering.

Engineered for direct OE replacement bolt-on installation, the Cusco differential mount increases chassis rigidity without specialized modifications. Improved control of the rear differential's movement enhances power delivery, reduces drivetrain slack, and can provide a more connected driving feel on street or track. Ideal for WRX and WRX STI models from 2008 through 2021 as well as other compatible AWD Subaru platforms, this upgrade supports enthusiasts seeking enhanced handling precision and stability.