Ford Explorer Sport Trac (2001-2010) Universal Joint Failure and Replacement
Diagnosing and fixing the common clunks and vibrations from the driveline in your Sport Trac.
- A clunk when shifting into gear or a vibration at highway speeds are the most common signs of a failing U-joint on your Sport Trac.
- Do not ignore symptoms; a complete failure can cause the driveshaft to detach, leading to loss of control and severe vehicle damage.
- Choose a non-greasable (sealed) U-joint from a quality brand like Spicer for a durable, maintenance-free repair similar to the OEM part.
- Verify the exact U-joint size needed for your truck's year and drivetrain (RWD vs. 4WD), as they are not all the same.
Is Your Sport Trac Making a New Noise?
A worn-out universal joint is a common problem on the 2001-2010 Ford Explorer Sport Trac that can show up as a distinct noise or vibration. 🎬 Watch: Hear what a failing Sport Trac driveline sounds like. Because the original factory U-joints are non-serviceable (sealed and cannot be greased), they eventually wear out from use and exposure to the elements. When the internal needle bearings lose their lubrication and begin to wear, it creates excessive play in your driveline. This can lead to symptoms ranging from annoying sounds to serious safety concerns.
Symptoms of a Bad U-Joint
Listen and feel for these common signs of U-joint failure in your Sport Trac:
- Clunking or Pinging Noise: The most frequent complaint is a sharp 'clunk' or 'ping' when you shift from Park into Drive or Reverse. This is the sound of the driveshaft taking up the slack in the worn joint.
- Vibration While Driving: A vibration that you can feel through the floor or seat is a classic symptom. This vibration often gets worse as your speed increases and is most noticeable at highway speeds. 🎬 See how a mechanic diagnoses and replaces these worn joints. Owners sometimes report this starting around 50-70 MPH.
- Squeaking or Chirping: A rhythmic squeak that corresponds with the rotation of the driveshaft (not the wheels) is another tell-tale sign. This sound is often more apparent at lower speeds because road and wind noise can drown it out as you go faster.
Don't Ignore a Failing U-Joint
While you can drive with a failing U-joint for a short time, it is not recommended. If a U-joint breaks completely, the driveshaft can detach from the vehicle. This will cause an immediate loss of power and can lead to catastrophic damage to your transmission, exhaust, fuel lines, and brake lines as it flails around under the truck.
Choosing the Right Aftermarket U-Joint
When replacing your U-joints, you have several quality tiers to choose from. You will also need to decide between a traditional greasable joint or a sealed, non-greasable one like the factory original.
Greasable vs. Non-Greasable (Sealed)
- Non-Greasable (Sealed): These are what your truck came with from the factory. They are stronger because the main body (cross) is solid steel. Their high-quality seals are designed to keep grease in and contaminants out for the life of the part, often lasting over 100,000 miles with no maintenance. This is a great 'fit-it-and-forget-it' option.
- Greasable: These have a zerk fitting that allows you to pump in fresh grease. This can extend the part's life by flushing out old grease and any contaminants like water or dirt, but only if you do it regularly (e.g., with every oil change). The hole for the zerk fitting makes the cross slightly weaker than a solid one, and if you forget to grease them, they will fail much faster than a sealed joint.
Pro Tip: If you don't plan on greasing your U-joints every 3,000-5,000 miles, choose a high-quality non-greasable (sealed) joint. It will be stronger and last longer than a greasable joint that is not maintained.
Aftermarket Brand Tiers
Based on mechanic and owner feedback, aftermarket brands generally fall into these categories:
- Tier 1 (OEM Quality or Better): Dana/Spicer is widely considered the original equipment manufacturer for Ford and the top choice for durability and fit. They offer both greasable and non-greasable versions that are known for their strength.
- Tier 1 (Heavy-Duty/Off-Road): Yukon Gear & Axle specializes in high-strength driveline components. They offer standard replacement U-joints as well as extreme-duty "Superjoints" for heavily modified or off-road trucks. These are for owners who need maximum strength.
- Tier 2 (Quality Aftermarket): SKF and Moog are well-known aftermarket brands. SKF has a solid reputation. Moog was once a top-tier brand, but some users have reported a decline in quality in recent years, so experiences can be mixed.
- Tier 3 (Economy): GMB is often seen as a budget-friendly option. While they can work for a daily driver, some users have reported quality issues right out of the box.
Cost to Replace Ford Explorer Sport Trac U-Joints
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket U-Joint (Single) | $18 - $108 |
| New OEM Ford U-Joint (Single) | $35 - $90 |
| Shop Labor (Per Joint) | $140 - $230 |
| Total Professional Replacement (Per Joint) | $160 - $330+ |
Known Issues, Recalls, and Bulletins
There are no active recalls or Technical Service Bulletins (TSBs) from Ford or the NHTSA specifically for universal joint failure on the 2001-2010 Ford Explorer Sport Trac. While other Ford models have had driveshaft-related recalls, they do not apply to this specific vehicle and part. Failure of these U-joints is considered a result of normal wear and tear over time.
Frequently Asked Questions (FAQ)
How many U-joints does my Sport Trac have?
It depends on your drivetrain. A Rear-Wheel Drive (RWD) model has two U-joints on the rear driveshaft. A Four-Wheel Drive (4WD) model has those two, plus one or two more on the front driveshaft. It's best to inspect your vehicle to confirm the exact number before ordering parts.
Do I need to get a specific size U-joint?
Yes, this is critical. The 2001-2005 (1st Gen) and 2007-2010 (2nd Gen) Sport Tracs may use different size U-joints (such as 1310 or 1330 series). Additionally, the front and rear driveshafts on 4WD models can use different joints. Always verify the correct part number for your specific year, engine, and drivetrain (RWD/4WD) before purchasing.
Can I replace just the one bad U-joint?
Yes, you can. However, if one U-joint has failed due to age and mileage, the others are likely not far behind. For peace of mind and to avoid doing the job twice, it is often recommended to replace all the U-joints on a driveshaft at the same time.
Is replacing a U-joint a DIY job?
This job is possible for an experienced DIYer, but it can be difficult. It requires safely raising the vehicle, removing the driveshaft, and using either a hydraulic press, a large bench vise, or a heavy-duty ball joint press/C-clamp to force the old joints out and press the new ones in without damaging the needle bearings. 🎬 Watch: DIY front U-joint replacement without using special tools. Rusted parts can make removal extremely challenging.
Helpful Videos
Technical Specifications
OEM Part Numbers: 6L2Z-4635-A 7A2Z-4635-C 4L5Z-4635-AA F2AZ-4635-C
Common sizes for the 2001-2010 Sport Trac include 1310 and 1330 series U-joints. The specific size depends on the model year, RWD vs 4WD configuration, and driveshaft position (front or rear). It is essential to match the part to your vehicle's specifications.
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.
- Ford Explorer Sport Trac:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Sport Trac Making a New Noise?
- Symptoms of a Bad U-Joint
- Don't Ignore a Failing U-Joint
- Choosing the Right Aftermarket U-Joint
- Greasable vs. Non-Greasable (Sealed)
- Aftermarket Brand Tiers
- Cost to Replace Ford Explorer Sport Trac U-Joints
- Known Issues, Recalls, and Bulletins
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off