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  3. FORD MERCURY D1FZ-4204-A

FORD MERCURY D1FZ-4204-A Rear Differential Nos

fits model: Mustang. make: Ford. year: 1971.

D1fz-4204-a Ford - Mercury 1971 Mustang Rear Differential Case Oem Nos

( Brand: Ford Mercury ), ( Manufacturer Part Number: D1FZ-4204-A ), ( Part Type: Case ), ( Vintage Part: Yes ), ( Placement On Vehicle: Rear ), ( Country Of Origin: United States )

Review FORD MERCURY Rear Differential Case Oem Nos fits MUSTANG 1971

Introducing the Ford Mercury D1FZ-4204-A 1971 Mustang Rear Differential NOS (New Old Stock), an authentic and original automotive component that is perfect for restoration projects or replacement of worn-out differentials in your classic Mustang. This differential is a crucial part of your vehicle's drivetrain, responsible for transmitting power from the engine to the wheels while also managing the torque and providing the necessary articulation for smooth steering.

The Ford Mercury D1FZ-4204-A is a 9-inch rear differential, featuring a 3.50 gear ratio. It is a factory original unit, meaning it was manufactured by Ford and originally used in a 1971 Mustang. The differential housing is made of high-strength cast iron, providing durability and reliability for the long haul.

The differential gears are precision-machined for optimal performance and are heat-treated for increased strength. The pinion gear and ring gear are both helical cut, reducing noise and vibration for a more comfortable driving experience. The differential comes with a new pinion seal, bearing caps, and axle nuts, ensuring a proper seal and secure installation.

This Mustang rear differential also features a Detroit Locker differential lock, which automatically engages when power is applied to the wheels with the least traction, improving traction and stability on slippery surfaces. The locking mechanism is actuated by a pair of spider gears, which engage when necessary to provide maximum grip and power transfer.

The Ford Mercury D1FZ-4204-A 1971 Mustang Rear Differential NOS is a complete unit, including all necessary hardware for installation. It is tested and inspected before shipping to ensure it meets the highest standards of quality. By choosing this genuine Ford part, you can be confident that you are restoring your Mustang with authentic, high-quality components that will provide reliable performance and enhance the value of your classic vehicle.

Pros and Cons of Buying a Ford Mercury D1FZ-4204-A 1971 Mustang Rear Differential NO S

Introduction:

The Ford Mercury D1FZ-4204-A is a rear differential assembly often used in 1971 Mustang models. Replacing the worn-out differential in your classic Mustang can enhance its performance and reliability. In this analysis, we will discuss the advantages and disadvantages of purchasing a new Ford Mercury D1FZ-4204-A rear differential.

Pros:

1. Improved Performance: Replacing a worn-out differential with a new one can restore the vehicle's original performance and improve its handling.

2. Reliability: A new differential assembly ensures that you will not face any unexpected failures, ensuring a more enjoyable driving experience.

3. Availability: The Ford Mercury D1FZ-4204-A rear differential is readily available from various automotive parts suppliers, making it easy to find and purchase.

4. Cost-effective: Buying a new differential assembly is often more cost-effective than rebuilding an existing unit, especially when considering the labor costs involved in a rebuild.

5. Enhanced Safety: A new differential assembly can help prevent potential accidents caused by differential failure.

Cons:

1. Upfront Cost: The initial cost of purchasing a new Ford Mercury D1FZ-4204-A rear differential can be relatively high compared to rebuilding an existing unit.

2. Installation Complexity: Installing a new differential assembly can be a complex process, requiring specialized tools and skills. It is recommended to have a professional mechanic perform the installation to ensure proper alignment and functionality.

3. Potential For Compatibility Issues: Ensure that the new differential assembly is compatible with your specific 1971 Mustang model, as some variations may require additional modifications or adapters.

Conclusion:

The Ford Mercury D1FZ-4204-A 1971 Mustang rear differential is an essential component for maintaining the performance and reliability of your classic Mustang. While there are some cons to consider, such as the initial cost and installation complexity, the advantages, including improved performance, reliability, availability, cost-effectiveness, and enhanced safety, make purchasing a new differential assembly a worthwhile investment.

Recommendation:

If you are considering replacing the differential assembly in your 1971 Mustang, it is recommended to purchase a new Ford Mercury D1FZ-4204-A rear differential from a reputable automotive parts supplier. Ensure that the differential is compatible with your specific model and consult a professional mechanic for installation to ensure proper functionality and alignment.

Details:

1971 Ford Mustang Rear Differential Case OEM NOS D1FZ-4204-A.

part #: d1fz4204 price

  • $300.00

specifications parthick:

  • for models: Mustang
  • for makes: Ford
  • for years: 1971
  • brand: Ford Mercury
  • mpn: D1fz-4204-a
  • part type: Case
  • vintage part: Yes
  • placement on vehicle: Rear
  • country of origin: United States

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  • rating: 100.0%
  • # reviews: 4722
  • city: San Bernardino, California

offer parthick:

  • options: Ship-to-home
  • sold: 0
  • quantity: 1
  • availability: In Stock
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  • started: November 30, 2025

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  • time: 30 Days
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shipping parthick:

  • cost: $18.94
  • type: Calculated
  • class: Economy
  • carrier: FedEx
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  • transit: 3-6 Days

general parthick:

  • Parts Accessories > Car Truck Parts Accessories > Other Car Truck Parts Accessories
  • condition: New other see details
for models: mustang, for makes: ford, for years: 1971, part type: case, vintage part: yes, placement on vehicle: rear, country of origin: united states,
category: auto parts > car truck parts accessories, sku: 12610404780706713,

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  • Offer #1: $300.00 price + $18.94 shipping estimate = $318.94* total. Ford Mustang. Rear Differential Case.+$18.94 shipping

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