SuperPro SPF4112-90K Rear Differential-to-Subframe Mount Bushing Set
The SuperPro SPF4112-90K is a Motorsport-durometer polyurethane bushing set that replaces the rear differential-to-subframe mount bushings, also known as the pinion mount bushings, on the 2013-2020 Subaru BRZ, Scion FR-S, Toyota 86, and 2022 and newer Subaru BRZ and Toyota GR86.
Key Features
- SPF4112-90K Motorsport-durometer polyurethane replaces soft factory rubber pinion mount bushings
- Reduces differential movement under changing loads for sharper, more consistent response
- Maintains factory-level noise, vibration, and harshness isolation in the cabin
- Resists the softening and degradation that shortens the life of rubber bushings
Fitment
| Year | Make | Model | Notes |
|---|---|---|---|
| 2013-2020 | Subaru | BRZ | Rear differential-to-subframe mount |
| 2013-2020 | Toyota | 86 | Rear differential-to-subframe mount |
| 2013-2020 | Scion | FR-S | Base, rear differential-to-subframe mount |
| 2022 | Subaru | BRZ | Rear differential-to-subframe mount |
| 2022 | Toyota | GR86 | Rear differential-to-subframe mount |
Specifications
| Detail | Value |
|---|---|
| Brand | SuperPro |
| Part Number | SPF4112-90K |
| Material | Polyurethane |
| Durometer Line | Motorsport |
| Mount Location | Rear differential-to-subframe (pinion mount) |
What’s Included
- 1 SPF4112-90K rear differential-to-subframe mount bushing set
About SuperPro
SuperPro engineers polyurethane suspension bushings designed to hold factory-level ride comfort while improving component location and service life compared with original rubber bushings.
Related Parts
- No additional related parts apply to this listing.
FAQ
What is the SPF4112-90K?
It is a SuperPro Motorsport-durometer polyurethane bushing set for the rear differential-to-subframe mount on the listed BRZ, FR-S, 86, and GR86 platforms.
What bushings does this kit replace?
The forward differential mount bushings, also called the pinion mount bushings.
Why do the factory bushings wear out?
The factory units are soft rubber that breaks down faster under hard use, allowing more differential movement.
Will this increase cabin noise or vibration?
No, the kit is designed to maintain factory-level noise, vibration, and harshness isolation.
What is the Motorsport durometer rating for?
It is SuperPro’s firmest bushing durometer, intended for track and performance-focused driving.
Does this fit the Toyota GR86?
Yes, it fits the 2022 and newer Toyota GR86 and Subaru BRZ in addition to the 2013-2020 BRZ, FR-S, and 86.
What symptoms indicate worn factory bushings?
Slower and sloppier rear-end response, along with possible noise and vibration under changing throttle load.
Does this kit include installation hardware?
This kit includes the replacement bushings sized for this application’s mount.
Installation Instructions
- Raise and support the vehicle and locate the rear differential-to-subframe mount.
- Support the rear differential before removing the factory mount bushing.
- Remove the factory pinion mount bushing from the mount location.
- Install the SuperPro bushing set into the same mount location.
- Torque all mounting hardware to the applicable factory specification.
