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  3. FORD C9AZ-4236-A

FORD C9AZ-4236-A Nos Gear Set Locking Differential 69

fits model: Mustang. make: Ford. year: 1970.

C9az-4236-a Ford Nos Side Gear Set Fits 69 70 Mustang 9 Inch Locking Differential

( Manufacturer Part Number: C9AZ-4236-A ), ( Part Type: Gear )

Review FORD Nos Side Gear Set Fits 69 Inch Locking Differential fits MUSTANG 1970

Introducing the Ford C9AZ-4236-A NOS (New Old Stock) gear set for the locking differential of the 1969 and 1970 Ford Mustang. This authentic piece of automotive history comes straight from the manufacturer's original production, making it an exceptional find for Mustang enthusiasts and restorers.

The Ford C9AZ-4236-A NOS gear set is designed specifically for the Ford 9-inch locking differential, which was widely used in Ford muscle cars during the late 1960s and early 1970s. This gear set includes all the necessary gears for a functional differential: ring gear, pinion gear, third member bearing, and four pinion bearings.

Each gear in this set is meticulously crafted from high-quality steel, ensuring durability and reliability. The gears are precision-machined to exacting specifications and feature smooth, uniform tooth surfaces that promote efficient power transfer and minimal wear.

The ring gear measures 29 inches in diameter and is designed to securely hold the differential assembly together. The pinion gear, which engages with the ring gear to transmit engine power to the differential, has a tooth count of 31. Both the ring and pinion gears are hardened and shot-peened to improve their strength and durability.

The third member bearing is a critical component that supports the differential's housing and allows it to rotate smoothly. This NOS third member bearing is made of heavy-duty steel and is precision-machined to ensure a perfect fit.

The four pinion bearings support the differential's pinion shaft and allow it to rotate freely. These bearings are also made of high-quality steel and are designed to last, ensuring that the differential operates efficiently and quietly.

In summary, the Ford C9AZ-4236-A NOS gear set is an essential upgrade for any 1969 or 1970 Ford Mustang with a locking differential. This authentic, original gear set not only guarantees optimal performance but also adds value to your classic Mustang by maintaining its historical accuracy.

Buying a Ford C9Az-4236-A NOs gear set for a 1969-1970 Mustang locking differential involves several considerations. Here are some potential pros and cons to help make an informed decision.

Pros:

1. Improved Traction: A locking differential provides better traction, especially during low-traction situations such as off-roading or drag racing. It allows both wheels on an axle to turn at the same speed, providing maximum power to the ground.

2. Enhanced Performance: With improved traction comes enhanced performance. A locking differential allows you to put more power to the ground, resulting in faster acceleration and better handling.

3. Customization: Installing a locking differential is a popular modification among Mustang enthusiasts, especially those who enjoy off-roading or drag racing. It adds value to your car and can be a source of pride for Mustang enthusiasts.

Cons:

1. Cost: The cost of purchasing and installing a locking differential can be significant. The Ford C9Az-4236-A NOs gear set alone can cost several hundred dollars, and the cost of installation can add several hundred more.

2. Complexity: Installing a locking differential requires a high level of mechanical expertise. It involves removing the rear axle, disassembling the differential, and installing the new gear set. This process can be time-consuming and complex.

3. Wear and Tear: A locking differential puts additional stress on the drivetrain components, including the differential gears, axle shafts, and CV joints. This can lead to increased wear and tear, which can result in additional maintenance and repair costs.

Conclusion:

The decision to buy and install a Ford C9Az-4236-A NOs gear set for a 1969-1970 Mustang locking differential depends on your specific needs and budget. If you enjoy off-roading or drag racing and are willing to invest in the additional cost and complexity, then a locking differential can provide significant performance benefits. However, if you are looking for a simple modification or are on a tight budget, then a locking differential may not be the best choice for you.

Recommendation:

If you are considering a locking differential for your 1969-1970 Mustang, we recommend doing thorough research and consulting with a professional mechanic to ensure that you understand the benefits, costs, and complexities involved. It's also important to consider alternative modifications or upgrades that may provide similar performance benefits but are less complex and costly. Ultimately, the decision should be based on your individual needs and goals for your Mustang.

Details:

Parts have very light surface rust from long-term shelf storage see photos for details. Original Ford service parts box included. Never installed. Packaging may show shelf wear or distributor marks.

Ideal For: Rear axle rebuilds with locking carriers. Genuine Ford Side Gear Kit Part #: C9AZ-4236-A OEM gear set for 9-inch locking differentials with 28-spline axles, used in 1969 1970 Mustang, Tiring, and Fair lane applications. Condition New Old Stock NOS. Correct for 9 rear axle in 1969 70 Ford Mustang, Tiring, Fair lane, and Mercury equivalents.

Collectors needing factory-stamped drive train parts. Fits 28-spline locking differentials, not open carriers. Fitment Features. Includes 2 side gears and thrust washers, all factory-original matched.

Restorers sourcing correct OEM internals.

part #: c9az4236 prices

  • $44.99-$169.00

specifications othellodrivetrain:

  • for models: Mustang
  • for makes: Ford
  • for years: 1970
  • mpn: C9az-4236-a
  • part type: Gear

shipping othellodrivetrain:

  • cost: $14.40
  • service: USPS Ground Advantage, USPS Priority Mail, UPS Ground
  • class: Standard, Expedited
  • type: Calculated
  • carrier: USPS, UPS
  • transit: 3-8 Days

payments othellodrivetrain:

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  • credit card: Diners-club
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general othellodrivetrain:

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

offer othellodrivetrain:

  • availability: In Stock
  • quantity: 1
  • options: Ship-to-home
  • started: July 22, 2025
  • best offers: True
  • sold: 0

returns othellodrivetrain:

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

seller othellodrivetrain:

  • rating: 99.6%
  • city: Piedmont, South Carolina
  • # reviews: 4459
for models: mustang, for makes: ford, for years: 1970, part type: gear,
category: auto parts > car truck parts accessories > transmission drivetrain, sku: 8274604392833762,

Ford C9AZ-4236 Is Similar To:

othellodrivetrain logo
5 offers $44.99–$169.00 USD
  • Offer #1: $44.99 price + $16.45 shipping estimate = $61.44* total. Genuine Ford Side Gear Kit Part #: -B Original Ford gear set for9" rear axle differentials, commonly used in1969 1970 Ford passenger cars and light trucks. Group 4236 Differential gear set components.+$16.45 shipping
  • Offer #2: $119.00 price + $20.75 shipping estimate = $139.75* total. CHECK IT OUT. 28-SPLINE These are ORIGINAL FORD NOS PARTS.+$20.75 shipping
  • Offer #3: $169.00 price + $18.05 shipping estimate = $187.05* total. Impossible To Find NOS (For locking axle).+$18.05 shipping
  • Offer #4: $91.11 price + $18.22 shipping estimate = $109.33* total.+$18.22 shipping
  • Offer #5: $45.00 price + $0.00 shipping estimate = $45.00* total. See pics for condition. New NOS Ford side gear kit, part number -A.FREE SHIPPING

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