Plymouth Trailduster (1974-1981) Universal Joint Replacement Guide
Keep your classic 4x4 running strong by understanding when and how to replace your universal joints.
- A clunking noise when shifting gears is a primary symptom of a bad U-joint.
- Ignoring symptoms can lead to driveshaft separation, causing severe damage and loss of vehicle control.
- For a Trailduster, especially one used off-road, premium greaseable brands like Dana Spicer or Moog are recommended for longevity.
- Verify the exact size needed before ordering, as multiple U-joint sizes were used on these vehicles.
Symptoms of a Failing Universal Joint
A worn or failing U-joint will give you some clear warning signs. Ignoring them can lead to a complete failure where the driveshaft can detach, causing major damage and a dangerous loss of control. Listen and feel for these common symptoms:
- Clunking Noise: A loud "clunk" or "bang" when you shift into drive or reverse is a classic sign of a bad U-joint. This is caused by excessive play in the worn joint.
- Vibrations: You might feel a vibration throughout the vehicle, especially at highway speeds. This happens when the worn U-joint throws the driveshaft out of balance.
- Squeaking Sounds: A rhythmic squeaking noise that changes with your speed often points to a U-joint that has lost its grease and is now running metal-on-metal. This sound is usually more noticeable at lower speeds.
Choosing the Right Aftermarket U-Joint
Since your Trailduster is a classic, finding original equipment (OEM) parts is difficult. The aftermarket is your primary source for new U-joints. The quality of aftermarket parts can vary, but reputable brands offer components that meet or exceed original specifications. For a vehicle like the Trailduster, which may be used for towing or off-roading, choosing a quality U-joint is important for durability.
Aftermarket Brand Tiers
| Brand | Tier | Key Features & Reputation |
|---|---|---|
| Dana Spicer | Premium | Often considered the gold standard and an original equipment manufacturer for many vehicles. Spicer U-joints are known for their strength, durability, and excellent performance in demanding situations like off-roading. They offer different series, including the long-lasting Life Series® and the ultra-durable Spicer Extreme™ for heavy off-road use. | 🎬 Learn about the differences between Spicer 10 Series and SPL joints.
| Moog | Premium | A well-respected brand in the aftermarket, known for high-quality chassis parts. Moog U-joints are often greaseable, allowing for regular maintenance to extend their life. They are considered a strong and reliable choice for most applications, including off-highway use. |
| SKF | Mid-Grade | SKF is a major bearing manufacturer that also produces U-joints. They offer a range of products, including their "Brute Force" line for high-torque applications. Quality can be inconsistent according to some user forums, with some users preferring Spicer, while others have had good experiences. | 🎬 Watch this video to see the benefits of SKF U-joint parts.
| GMB | Economy | GMB offers a budget-friendly option that aims to meet OEM specifications. User reviews are mixed; some find them to be a good value, while others have reported roughness or lower quality compared to premium brands. 🎬 See why GMB universal joints are a popular budget-friendly choice. They can be a suitable choice for a daily driver under normal conditions. |
Pro Tip: Many U-joints for this vehicle are greaseable, meaning they have a small fitting (a zerk fitting) where you can add grease. Regular greasing is the best way to ensure a long life for your new U-joints. Non-greaseable joints are also available and are often stronger because the cross is solid, but they cannot be serviced.
Common Ordering Mistakes
The 1974-1981 Plymouth Trailduster used different U-joint sizes depending on the year, specific drivetrain configuration, and which axle it was equipped with. It is crucial to measure your existing U-joint's cap diameter and overall width or find the correct part numbers for your specific vehicle to ensure you order the correct part. Some suppliers offer kits for specific year ranges, which can simplify the process.
Frequently Asked Questions
How many U-joints does my Trailduster have?
Your 4WD Trailduster will have multiple U-joints. There are joints on the front and rear driveshafts (connecting to the transfer case and axles) and also in the front axle shafts themselves (at the steering knuckles). A complete replacement can involve several parts.
Should I choose a greaseable or non-greaseable U-joint?
Greaseable U-joints allow for maintenance, which can flush out contaminants and extend the part's life, making them a good choice for off-road use. Non-greaseable joints are often stronger out of the box because the cross isn't hollowed out for a grease channel, and they feature better seals. For most users, a quality greaseable joint from a brand like Moog or Spicer that is regularly maintained is an excellent choice.
Is it difficult to replace a U-joint?
Replacing a U-joint requires moderate mechanical skill. It involves removing the driveshaft and using a press or a hammer and socket method to remove the old joint and install the new one. It is a feasible DIY job for an experienced home mechanic, but a shop can do it as well. The estimated shop labor cost is between $200 and $450.
Were there any recalls for the Trailduster's U-joints?
No specific recalls or Technical Service Bulletins (TSBs) were found related to the universal joints on the 1974-1981 Plymouth Trailduster during our search. Failure is typically due to normal wear and tear, lack of lubrication, or damage from use.
Helpful Videos
Technical Specifications
U-joint selection is specific to driveshaft type (front/rear) and axle configuration. Common Mopar-style joints include the 7260 and 7290 series, which are identified by cap diameter and whether they use internal or external clips. Measurement of the original part is highly recommended for accuracy.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.