Perrin Differential Lockdown System Subaru WRX 15-26 / STI 15-21 | PSP-DRV-536

Lock down your drivetrain for sharper response and reduced flex with the PERRIN Rear Differential Lockdown kit. Engineered to limit rear differential movement, this upgrade delivers crisper throttle feedback, especially under load, while maintaining drivability for street and track use.

Key Features & Benefits

• Minimizes differential twist and unwanted motion during acceleration, braking, and cornering

• Provides a more direct, connected feel to the drivetrain with improved torque transfer

• Requires no heavy fabrication or special tools for installation—designed to be installed with basic hand tools in under an hour

• Adds minimal NVH (noise, vibration, harshness) while increasing chassis feedback
  

Specifications & Fitment Notes

• Estimated Install Time: Approximately 45 minutes or less

• Difficulty Level: Moderate

• Mounting Components Included: Bushings, support plate(s), hardware, and instructions

Installation & Tips

• Differential must be supported during install and components aligned correctly

• Torque all hardware according to specification and gradually tighten to avoid misalignment

• After installation, verify drivetrain behavior and re-check torque after an initial break‑in period

• Expect a subtle increase in drivetrain rigidity without harsh compromises to everyday driving

Why Choose the PERRIN Differential Lockdown?

When the drivetrain is allowed to twist unexpectedly, you lose precision. This kit helps eliminate that slop. By reducing movement in the rear differential, you get sharper power delivery, better driver feedback, and more predictable behavior under aggressive driving or upgrades.