01X.409.121.A PORSCHE Differential Transaxle Cayman Boxster

Review PORSCHE 987 Open Differential Cayman/boxster Speed Transaxle for CAYMAN BOXSTER

Introducing the Porsche 01X.409.121.A 987 Differential for Cayman and Boxster models, a high-performance component engineered to deliver exceptional driving dynamics and durability. This transaxle differential is a crucial part of the powertrain system, responsible for transferring engine power to the wheels while managing the torque distribution between them.

The Porsche 01X.409.121.A 987 Differential is an evolution of Porsche's proven design, featuring a compact and lightweight construction made primarily of aluminum. Its robust build quality ensures reliable operation under the most demanding driving conditions, making it an ideal choice for both road and track use.

This differential employs a viscous limited-slip differential mechanism, which optimally distributes engine torque between the wheels based on the available traction. During cornering, the differential allows the inner wheel to rotate at a slower speed than the outer wheel, reducing the load transfer and improving overall stability and grip.

The Porsche 01X.409.121.A 987 Differential also includes an integrated oil cooler, which maintains optimal operating temperatures to ensure consistent performance and longevity. The cooling system minimizes the risk of thermal degradation of the differential oil, reducing the potential for damage and wear.

Additionally, this transaxle differential boasts a maintenance-friendly design, allowing easy access to the differential oil for routine checks and changes. The use of high-quality synthetic oil ensures smooth and efficient operation, while also contributing to a longer service life.

In summary, the Porsche 01X.409.121.A 987 Differential is an essential upgrade for Cayman and Boxster enthusiasts seeking to enhance their driving experience with improved traction, stability, and durability. Its compact, lightweight, and robust construction, combined with its advanced viscous limited-slip differential mechanism and integrated oil cooler, make it a must-have component for any Porsche enthusiast looking to maximize the performance potential of their vehicle.

Pros and Cons of Buying a Porsche 987 Differential (Cayman/Boxster Transaxle): A Detailed Analysis

The Porsche 987 differential, also known as the Cayman/Boxster transaxle, is a popular upgrade option for Porsche enthusiasts. This component is renowned for its robustness, performance, and handling improvements. However, like any other automotive part, it comes with its advantages and disadvantages. In this analysis, we'll dive into the details of the Porsche 987 differential to help you make an informed decision.

1. Improved Performance: The Porsche 987 differential offers better power transmission and offers improved traction, especially during hard acceleration and cornering.

2. Enhanced Handling: With its increased rigidity, the 987 differential significantly improves the vehicle's handling, making it more responsive and agile.

3. Durability: Known for its robustness, the 987 differential is designed to withstand high power outputs and heavy usage, making it an excellent investment for high-performance driving.

4. Upgrade Path: The 987 differential is a popular choice for those looking to modify their Porsche Cayman or Boxster, as it opens up new possibilities for further upgrades, such as aftermarket limited-slip differentials or gear sets.

1. Cost: The Porsche 987 differential is a premium upgrade and comes with a hefty price tag. This investment might not be suitable for those on a tight budget.

2. Complex Installation: Installing the 987 differential requires a significant amount of expertise and time, especially for those who opt for a DIY installation.

3. Weight: The 987 differential is heavier than the standard differential, which might negatively impact the vehicle's fuel economy and overall weight distribution.

4. Limited Compatibility: The 987 differential is only compatible with certain Porsche models and years, limiting its applicability to a specific segment of the Porsche community.

The Porsche 987 differential is an excellent upgrade option for those who value performance, handling, and durability. Its improvements in power transmission, rigidity, and traction make it a worthwhile investment for Porsche enthusiasts. However, its high cost, complex installation process, added weight, and limited compatibility might deter some buyers. Ultimately, the decision to buy a Porsche 987 differential depends on your individual preferences, budget, and driving goals.

If you're a Porsche enthusiast looking to significantly improve your vehicle's performance and handling, the Porsche 987 differential is an excellent choice. However, before making a purchase, consider your budget, technical expertise, and the compatibility of the differential with your specific Porsche model and year. Additionally, weigh the benefits against the potential drawbacks to ensure that this upgrade aligns with your priorities and driving style.

Details:

01x.498.081 both tapered roller bearings included. Weighs 13 lbs. Pinion/spider gears, shaft etc. Removed from 2006 Cayman's 987 with 6 speed transaxle at 115,00 miles always used synthetic fluids.

Fits in 05-08 Boxster and Cayman 01X.409.121.A housing ring/crown gear bolts not included.

specifications differentialsdepo:

• for models: Cayman, Boxster
• brand: Porsche
• mpn: 01x.409.121.a
• oe/oem part number: 01x.498.081
• item diameter: 6 In
• item length: 8 In
• placement on vehicle: Rear
• country of origin: Germany

shipping differentialsdepo:

• service: usps ground advantage
• carrier: usps
• class: standard
• transit: 4-10 days
• type: calculated

offer differentialsdepo:

• availability: in stock
• options: ship-to-home
• in stock #: 2
• started: october 19, 2025
• sold #: 19
• best offers: true
• prices: $129.95–$135.00
• item condition:
  • Used
  • New other (see details)

payments differentialsdepo:

• wallet: google-pay
• other
• credit card: mastercard

general differentialsdepo:

• category: Auto Parts > Transmission Drivetrain > Differentials > Assemblies

seller differentialsdepo:

• rating: 100.0%
• city: washougal, washington
• # reviews: 317

returns differentialsdepo:

• policy: no returns