CADILLAC 3515403 Right Front Drive Shaft

( Manufacturer Part Number: 3515403 ), ( Part Type: Driveshaft ), ( Vintage Part: Yes ), ( Universal Fitment: No ), ( Country Of Origin: United States ), ( Placement On Vehicle: Front, Right, Passenger Side ), ( Other: 68 69 70 71 72 73 74 75 76 77 78 )

Review CADILLAC Right Pass Side Front Final Drive Output Shaft Support fits ELDORADO 1976

The **Cadillac 3515403 76 Eldorado Right Front Drive Shaft** is a meticulously crafted, high-performance automotive component designed exclusively for 1976 Cadillac Eldorado models, ensuring seamless integration and optimal functionality within the vehicle s drivetrain system. This drive shaft, identified by its unique part number **3515403**, is engineered to deliver reliable power transfer from the transmission to the front wheels, maintaining the iconic handling and driving dynamics for which the Eldorado is renowned. Constructed from premium-grade steel, this drive shaft is built to withstand the rigorous demands of daily driving, high-speed cruising, and spirited acceleration, all while preserving the classic elegance and robustness of the 1976 Eldorado s powertrain. The design incorporates a robust universal joint (U-joint) assembly at both ends, allowing for smooth articulation and flexibility as the suspension moves, thereby reducing wear and preventing premature failure. The right-side orientation ensures precise alignment with the Eldorado s front-wheel-drive configuration, where the drive shaft plays a critical role in distributing torque evenly to the wheels while minimizing vibration and noise. Whether used in a restored classic or a meticulously maintained vintage vehicle, this drive shaft exemplifies Cadillac s commitment to durability and performance, offering a perfect blend of heritage engineering and modern reliability. Its compatibility with the Eldorado s V8 engine options including the legendary **429 cubic-inch or 455 cubic-inch powerplants** makes it an essential upgrade or replacement part for enthusiasts seeking to restore or enhance their vehicle s drivetrain integrity. With its sturdy construction and precise engineering, this drive shaft stands as a testament to the timeless craftsmanship that defines Cadillac s legacy in automotive excellence.

### **Pros and Cons of Buying a 1976 Cadillac Eldorado Right Front Drive Shaft (Part Number: 3515403)**

#### **Pros**

1. **Original Equipment Quality** Cadillac historically used high-quality materials in its drivetrain components, including drive shafts. This part was designed to last under proper conditions, making it a durable choice if sourced from a reputable supplier.

2. **Compatibility** The 3515403 is a direct replacement for the right front drive shaft in a 1976 Eldorado with a V8 engine (likely the 429 or 455 cubic inch model). It ensures proper fitment without modification, assuming the vehicle s drivetrain alignment is correct.

3. **Reliability (If New or Well-Maintained)** If the part is new or comes from a trusted aftermarket supplier (such as a remanufacturer or a dealer with a warranty), it should perform reliably. Original parts from the era were built to last, though wear over time is inevitable.

4. **Easier Maintenance** Replacing a drive shaft is a manageable DIY project for those with basic mechanical skills. It requires proper tools (like a drive shaft separator or press) and patience, but it avoids the complexity of engine or transmission work.

5. **Potential for Customization** If restoring or modifying the vehicle, a high-quality drive shaft ensures smooth power delivery, which can enhance performance if paired with other upgrades (e.g., exhaust, suspension, or engine tuning).

6. **Resale Value (If Restored)** A well-maintained 1976 Eldorado with original or high-quality aftermarket parts retains collector appeal, especially if it s part of a complete restoration project.

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#### **Cons**

1. **Age and Wear** The part is over 40 years old, meaning it may have been stored improperly, exposed to rust, or weakened by fatigue. If sourced from a salvage yard, it could be in poor condition despite its original quality.

2. **Difficulty in Sourcing** Finding an exact OEM replacement (3515403) may be challenging. Some suppliers may sell a "compatible" but not identical part, which could lead to fitment issues or premature failure.

3. **Cost** A genuine OEM drive shaft from a reputable source (e.g., a dealer or remanufacturer) can be expensive, often costing **$300 $800 **, depending on condition and supplier. Aftermarket alternatives may be cheaper but risk quality inconsistencies.

4. **Rust and Corrosion** Older drive shafts, especially those from vehicles exposed to salt or moisture, may have internal corrosion or cracked yokes. Inspecting the part thoroughly (or replacing u-joints) is critical before installation.

5. **Installation Challenges** Improper installation can lead to premature failure. Misalignment, loose bolts, or incorrect torque settings can cause excessive wear on the universal joints (u-joints) or the shaft itself.

6. **Limited Warranty Options** If purchasing used, warranties are unlikely. Even new aftermarket parts may come with limited warranties (e.g., 90 days), leaving you responsible for long-term reliability.

7. **Alternative Solutions May Exist** Depending on the vehicle s condition, a **rebuilt or remanufactured drive shaft** (from a company like **Mopar, Moroso, or a specialty shop**) might offer better value with warranties and modern materials.

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### **Conclusion**

- You source it from a **trusted supplier** (e.g., a dealer, remanufacturer, or salvage yard with a clean history).

- You **inspect it thoroughly** for rust, cracks, or worn u-joints before purchasing.

- You are prepared for the **cost and potential installation challenges**.

However, if the part is **difficult to find, expensive, or in questionable condition**, alternatives like a **remanufactured shaft or a compatible aftermarket part** may be more practical. Additionally, if the vehicle is being restored, prioritizing **u-joint condition and alignment** is crucial to extending the shaft s lifespan.

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### **Recommendation**

1. **Verify the Part s Origin** If possible, buy from a **Cadillac dealer, a reputable remanufacturer, or a salvage yard with a verified history**. Avoid parts from unknown sources unless inspected by a mechanic.

2. **Inspect or Replace U-Joints** Even if the shaft itself looks good, the **universal joints** (especially the constant-velocity or "cage" type) may be worn. Replacing them (or the entire shaft) is often worth the extra cost for long-term reliability.

3. **Consider a Remanufactured Shaft** Companies like **Moroso, Mopar, or local drive shaft specialists** offer remanufactured parts with warranties. These may cost slightly more upfront but provide peace of mind.

4. **Budget for Installation** If not experienced, have a mechanic install the shaft to ensure proper alignment and torque. Improper installation is a leading cause of drive shaft failure.

5. **Evaluate Vehicle Context** If the Eldorado is a **project car**, weigh whether the drive shaft is a **critical priority** or if other systems (engine, transmission, suspension) need attention first.

If you can **find a high-quality, inspected part at a reasonable price** and are prepared for installation, the **3515403 is a viable choice**. Otherwise, a **remanufactured or aftermarket shaft with a warranty** may be the safer option. Always prioritize **u-joint condition and proper fitment** to avoid premature failure.

Details:

Keeping the Classics Alive. This was cleaned/decreased. The list goes on. Please look at all pics and ask any questions prior to buying.

OEM 76 Cadillac Eldorado: RIGHT PASSENGER SIDE: FRONT FINAL DRIVE OUTPUT SHAFT: W/ SUPPORT: PLEASE LOOK AT PICS COMPARE TO YOUR VEHICLE BEFORE PURCHASING. Threads in mounting holes were chased and are all excellent condition. Please view all pictures as they are a part of the. Bearing feels good, didn't make any noise, however it is 50 years old, so consider free with purchase.

What you see anther pictures is what get. This was removed from a low miles 1976 Cadillac Eldorado and the car overall very clean, not something that sitting in weeds for years. What you see in the pics is what get. This OEM front passenger side final drive output shaft is in very good condition.

Splines are all in very good condition. I sell used parts, and therefore all parts may have imperfections as would be expected from a part, such scratches, wear, etc. Please look at all pictures and/or videos and ask questions prior to purchasing be sure the item you are is correct part.

part #: 3515403 prices

• $125.00-$274.99

specifications universajoin:

• for models: Eldorado
• for makes: Cadillac
• for years: 1976
• mpn: 3515403
• part type: Driveshaft
• vintage part: Yes
• universal fitment: No
• country of origin: United States
• placement on vehicle: Front, Right, Passenger Side
• other: 68 69 70 71 72 73 74 75 76 77 78

returns universajoin:

• policy: No Returns

payments universajoin:

• wallet: Paypal
• credit card: Diners-club
• other

general universajoin:

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

seller universajoin:

• rating: 100.0%
• city: Kenilworth, New Jersey
• # reviews: 4788

shipping universajoin:

• carrier: USPS, UPS
• type: Calculated
• service: USPS Ground Advantage, UPS Ground
• class: Standard
• cost: $69.45
• transit: 3-8 Days

offer universajoin:

• quantity: 1
• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: June 2, 2026

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