MOPAR REPRODUCTION FR91 Rear Differential Axle 3/4 3.91

( Brand: Mopar Reproduction ), ( Manufacturer Part Number: FR91 ), ( Part Type: Axle ), ( Vintage Part: Yes )

Review MOPAR REPRODUCTION Plymouth Dodge Chrysler 3/4 Rear Differential Axle 3.91 Ratio Tag

Introducing the Mopar Reproduction FR91 3/4 Rear Differential Axle with a gear ratio of 3.91, an essential upgrade for your Plymouth, Dodge, or Chrysler muscle car. This axle assembly is a meticulously engineered reproduction, designed to provide superior performance and reliability, ensuring an authentic driving experience.

The core of this axle is a forged steel differential housing, manufactured to exacting specifications, ensuring a perfect fit and finish. The housing is then fitted with a new 3.91:1 ring and pinion set, which delivers an ideal balance of power and torque for your muscle car. This gear ratio is well-suited for high-performance driving, enabling quick acceleration and impressive power delivery.

One of the most notable features of this Mopar Reproduction FR91 axle is the inclusion of an authentically designed, heavy-duty, stamped steel axle shaft. These axle shafts are precision machined for a perfect fit and are manufactured to meet or exceed original equipment specifications. The strength and durability of these axle shafts are unmatched, ensuring a solid connection between the differential and your vehicle's wheels.

The sealing system on this Mopar Reproduction FR91 axle is another standout feature. The axle comes equipped with new, high-quality, lip-type seals that provide an effective barrier against leaks. These seals prevent valuable differential fluid from escaping, ensuring optimal performance and extended component life.

This Mopar Reproduction FR91 3/91 axle is also compatible with a wide range of factory suspension systems, making it a versatile choice for muscle car enthusiasts. The axle is also available in various configurations to accommodate different wheelbase lengths and vehicle applications.

In summary, the Mopar Reproduction FR91 3.91 Rear Differential Axle is a high-performance upgrade for your Plymouth, Dodge, or Chrysler muscle car. With its forged steel housing, new ring and pinion set, heavy-duty stamped steel axle shafts, and effective sealing system, this axle assembly is sure to deliver the power, torque, and reliability you demand from your muscle car.

Mopar reproduction 3.91 rear axle assemblies for Plymouth, Dodge, and Chrysler 3/4 ton trucks are aftermarket parts manufactured by Mopar, a division of FCA US LLC. These differentials offer various advantages and disadvantages depending on the user's specific requirements and circumstances.

1. Authenticity: These axles are manufactured by the original equipment manufacturer (OEM), ensuring a high level of quality, fit, and finish.

2. Performance: A 3.91 gear ratio provides a good balance between acceleration and fuel efficiency, making it suitable for both daily driving and towing applications.

3. Durability: Mopar reproduction axles are engineered using modern manufacturing processes and materials, which can lead to increased strength and longevity compared to original equipment.

4. Availability: Mopar reproduction axles are readily available, ensuring that customers can easily access replacement parts without having to search for used or aftermarket alternatives.

1. Cost: Mopar reproduction axles are typically more expensive than aftermarket alternatives, which can be a significant deterrent for some customers.

2. Limited Customization: Since these axles are manufactured to OEM specifications, they may not offer the same level of customization as aftermarket options.

3. Potential Fitment Issues: While Mopar reproduction axles are designed to fit specific model years and applications, there is still a possibility of fitment issues arising due to variations in vehicle condition or manufacturing tolerances.

Mopar reproduction 3.91 rear differential axles offer several advantages, such as authenticity, performance, durability, and availability. However, they also come with some disadvantages, including cost, limited customization, and potential fitment issues. Ultimately, the decision to purchase a Mopar reproduction 3.91 rear differential axle depends on the individual's priorities, budget, and specific requirements.

If authenticity, performance, and durability are top priorities, and the budget allows, a Mopar reproduction 3.91 rear differential axle would be an excellent choice. However, if cost is a concern or the user requires a high degree of customization, an aftermarket alternative may be a better option. It's essential to carefully consider the specific requirements and circumstances before making a final decision.

Details:

Measures 1-1/2 x 3/4. Mopar 8 3/4 Rear Differential Axle 3.91 Ratio Tag: This is an authentic restoration part. Should be correct for 1962 up to mid 70's.

part #: fr91 prices

• $14.95-$17.15

specifications othellodrivetrain:

• for makes: Plymouth, Dodge, Chrysler, Mopar
• brand: Mopar Reproduction
• mpn: Fr91
• part type: Axle
• vintage part: Yes

offer othellodrivetrain:

• quantity: 1
• started: January 31, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home

payments othellodrivetrain:

• wallet: Apple-pay
• other
• credit card: Mastercard

general othellodrivetrain:

• Car Truck Parts Accessories > Transmission Drivetrain > Other Transmission Drivetrain
• condition: New

seller othellodrivetrain:

• rating: 99.8%
• # reviews: 85487
• city: Fairmount, Georgia

shipping othellodrivetrain:

• transit: 5-12 Days
• cost: $8.10
• class: Standard
• carrier: USPS, UPS
• service: USPS Ground Advantage, UPS Ground
• type: Calculated

returns othellodrivetrain:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

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