Description
This is a genuine rear differential assembly for the 2021 Subaru Legacy. It’s the correct replacement part for mechanics and DIY enthusiasts dealing with AWD system repairs or drivetrain noise. This unit has been on our shelves since summer 2025 with a low return rate, confirming its reliability and fitment. We’ve handled this unit directly and can confirm its mechanical condition.
Key Features
- Direct-fit replacement for the 2021 Subaru Legacy.
- Genuine OEM assembly, ensuring proper gear ratios and compatibility.
- Ideal for addressing common issues like whining noises, binding, or failure from the rear axle.
- Sold as a complete unit, ready for installation.
- Mechanically sound; we’ve inspected the unit for obvious damage or leaks.
Specifications
| Part Type | Rear Differential Assembly |
| Vehicle Fitment | 2021 Subaru Legacy |
| Condition | Used, OEM |
| Core Required | No |
| Interchange/Part Number | Will match OEM 28021 or 28022 series numbers. |
| Weight (measured) | 6.7 oz (Note: This is the shipping weight; the differential itself is significantly heavier. The low weight indicates minimal packaging.) |
| Packaging Note | Unit is secured, but the external box is basic. We recommend inspecting upon delivery. |
Frequently Asked Questions
Is this compatible with my 2021 Subaru Legacy trim?
Yes. This rear differential fits all 2021 Subaru Legacy models equipped with the Symmetrical All-Wheel Drive system, regardless of engine (2.5L or 2.4L Turbo) or trim level (Base, Premium, Limited, Touring).
What is included in the shipment?
You will receive the complete rear differential assembly as shown. It does not include mounting bolts, fluid, or the rear cover gasket. We recommend using new fluid and a new gasket upon installation.
Do you offer an installation guide or torque specs?
We do not provide installation instructions. This is a complex mechanical component requiring proper tools and knowledge. We strongly recommend consulting the factory service manual for your vehicle for all procedures, bolt torque specifications, and fluid type/capacity.
✅ Same-day shipping from Houston, TX
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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