AMERICAN MOTORS 431-01723 Rear Drive Shaft Automatic Pacer Transmission 75-76

( Brand: American Motors ), ( Model: PACER ), ( Part Type: Driveshaft Transmission Motor ), ( Conditions Options: Ck Id ), ( Genuine Oem: Yes ), ( Ipn: 431-01723 ), ( Make: American ), ( Warranty: 60 Day ), ( Partout Id: A-112271989 )

Review AMERICAN MOTORS Rear Drive Shaft Automatic Transmission 75-76 Pacer fits 1976

The **American Motors 431-01723 Rear Drive Shaft for 1975-1976 AMC Pacer with Automatic Transmission** is a meticulously engineered, high-performance drivetrain component designed to deliver uncompromising durability and smooth power delivery in one of the most iconic compact muscle cars of the late 1970s. This drive shaft, part of AMC s robust rear-wheel-drive architecture, is crafted to handle the unique torque demands of the Pacer s powerful V8 engines, including the legendary 304 or 360 cubic inch inline-six or V8 options paired with the smooth-shifting **TorqueFlite automatic transmission**. Engineered with precision, the shaft features a **slip-yoke design** at the transmission end, allowing for slight axial movement as the vehicle s suspension absorbs road imperfections, thereby reducing stress on the drivetrain and preventing premature wear. The **constant-velocity (CV) universal joint** at the rear axle end ensures consistent power transfer while accommodating the Pacer s distinctive rear-wheel-drive geometry, even during aggressive cornering or off-road excursions. Constructed from **high-grade steel tubing**, this drive shaft is heat-treated and dynamically balanced to minimize vibration, ensuring a quiet and comfortable ride even at higher speeds. The **spline connections** at both ends are precision-machined to fit seamlessly with the Pacer s transmission output flange and axle input flange, guaranteeing a secure and leak-free seal. Whether restoring a classic Pacer for weekend cruising or preparing it for high-performance driving, this **OEM-replacement drive shaft** is an essential component that restores factory-level reliability, making it a must-have for enthusiasts seeking to preserve or enhance the integrity of their vehicle s drivetrain.

### **Pros and Cons of Buying a 1975-1976 AMC Pacer (431-01723 Rear Drive Shaft, Automatic Transmission)**

#### **Pros**

1. **Classic Design and Nostalgia** The AMC Pacer is a unique and recognizable vehicle from the 1970s, appealing to collectors and enthusiasts who appreciate its boxy, futuristic styling. Its distinct shape makes it stand out on the road.

2. **Reliability of AMC s Transmissions** The automatic transmission (likely a TorqueFlite or similar) in these models was known for being durable, especially when properly maintained. Many early automatic transmissions from this era can last well over 200,000 miles with regular servicing.

3. **Potential for Restoration or Modification** The Pacer has a strong aftermarket presence, with parts available for restoration, performance upgrades, and customization. Its boxer engine (if equipped) or inline-six options can be tuned for better performance.

4. **Lower Purchase Price** Compared to more desirable classics (like Mustangs or Camaros), a 1975-76 Pacer is often cheaper, making it an accessible entry into the collector car market.

5. **Unique Drivetrain Options** The rear-wheel-drive configuration (with the 431-01723 drive shaft) is less common than front-wheel drive in Pacers, which could make it more sought after by enthusiasts who prefer RWD handling.

6. **Potential for Fuel Economy (Compared to Muscle Cars)** While not a high-performance vehicle, the Pacer s inline-six or V8 options (depending on the trim) were designed for practicality rather than raw power, meaning better fuel economy than contemporaries like the Challenger or GTO.

7. **Community and Enthusiast Support** The AMC Pacer has a dedicated following, with clubs, forums, and events where owners share knowledge, parts, and restoration tips.

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#### **Cons**

1. **High Maintenance Costs** AMC vehicles from this era are known for requiring frequent maintenance, especially if the car has been neglected. Rust, worn suspension components, and outdated electrical systems can add up quickly.

2. **Rust Issues** Many Pacers (especially those from the late '70s) suffer from rust, particularly in the wheel wells, frame rails, and undercarriage. A thorough inspection is critical before purchase.

3. **Limited Performance** The standard engines (like the 250 or 304 inline-six) were not powerful by modern standards, and even the V8 options (like the 360 or 401) were not high-revving or high-torque machines. Driving dynamics may feel sluggish compared to modern cars.

4. **Parts Availability Challenges** While parts exist, some components (especially for RWD models) can be harder to find than for more common classics. Stockpiling spare parts may be necessary for long-term ownership.

5. **Fuel and Emissions Compliance** Older vehicles often struggle with modern emissions standards. If you plan to drive it regularly, you may need to invest in emissions upgrades or risk fines in some states.

6. **Driving Experience** The Pacer s boxy design and heavy weight (especially with a V8) make it feel sluggish and underpowered. Handling is not sharp, and the ride can be stiff compared to modern cars.

7. **Resale Value is Low** While the Pacer has a cult following, its resale value does not compare to more desirable classics. If you plan to sell later, you may not recoup much of your investment.

8. **Potential for Hidden Problems** Automatic transmissions from this era can fail without warning, and the drivetrain (especially the rear axle and driveshaft) may require attention. A pre-purchase inspection is essential.

---

### **Recommendation**

Buying a **1975-1976 AMC Pacer with a rear drive shaft and automatic transmission** can be a rewarding experience if you are looking for a **unique, nostalgic, and project-worthy vehicle**. It offers a chance to restore or modify a classic car with a strong following, though it comes with **significant maintenance challenges, rust concerns, and limited practicality** for daily driving.

- Enthusiasts who enjoy **restoration projects** and don t mind investing time and money in repairs.

- Collectors who appreciate **rare or unconventional classics** and are willing to accept lower resale value.

- Owners who plan to **drive it occasionally** (not as a daily commuter) and enjoy the **vintage driving experience**.

- You need a **reliable, low-maintenance vehicle** for daily use.

- You are not prepared for **potential high repair costs**, especially if the car has rust or transmission issues.

- You expect **modern performance or fuel efficiency** this is a **practical but not powerful** classic.

If you find a **well-documented, rust-free example** with a **serviceable automatic transmission and drivetrain**, and you re willing to put in the work, a **1975-76 AMC Pacer RWD automatic** can be a fun and rewarding project. However, **budget for repairs, inspect thoroughly, and consider test-driving it to assess condition** before purchasing. If maintenance is a concern, factor in **at least $3,000 $5,000 ** in initial repairs to make it roadworthy. For most buyers, this is a **restoration project rather than a ready-to-drive classic**.

Details:

Therefore, normal wear/tear and cosmetic appearance should be expected. As American Standards: RT Passenger Side, Drivers Side. Used Front Drive Shaft. PACER 76 AT, outside u-joint locks.

AT Automatic Transmission, MT Manual Transmission. This is a used part. PACER 75 AT, outside u-joint locks, 3-7/16 wide yoke.

part #: 431-01723 price

• $59.38

specifications universajoin:

• for years: 1976
• brand: American Motors
• model: Pacer
• part type: Driveshaft Transmission Motor
• conditions options: Ck Id
• genuine oem: Yes
• ipn: 431-01723
• make: American
• warranty: 60 Day
• partout id: A-112271989

payments universajoin:

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

seller universajoin:

• city: Dunbar, Pennsylvania
• # reviews: 12635
• rating: 99.3%

offer universajoin:

• sold: 0
• options: Ship-to-home
• best offers: True
• availability: In Stock
• quantity: 1
• started: February 12, 2026

returns universajoin:

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

shipping universajoin:

• class: Standard
• cost: $82.27
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• transit: 5-8 Days
• type: Calculated

general universajoin:

• Transmission Drivetrain > Driveshafts Parts > Additional Driveshaft Parts
• condition: Used

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