A Home Mechanic's Guide to 1986-1992 Jeep Comanche Universal Joints
Everything you need to know to diagnose and replace the U-joints on your classic Jeep truck.
- U-joint failure symptoms include clunking noises, vibrations at speed, and squeaking sounds.
- For replacement, Dana Spicer is the top-tier OEM-quality choice, while Moog and SKF are excellent aftermarket options.
- 4WD Comanches have up to six U-joints that may need service; it's wise to inspect all of them if one fails.
- No specific recalls or TSBs were issued for Comanche U-joints; failures are due to age and wear.
Symptoms of a Bad U-Joint
A failing U-joint gives you a few warning signs. Ignoring them can lead to driveshaft failure, which can cause a lot of damage. Listen and feel for these symptoms:
Common Failure Signs
- Clunking Noise: A loud "clunk" or "bang" when you shift into Drive or Reverse is a classic sign of a worn U-joint. You might also hear it when accelerating or decelerating.
- Squeaking or Chirping: A repetitive, rotational squeak that changes with speed often points to a dry or failing U-joint. This is usually most noticeable at lower speeds.
- Vibrations: A vibration you can feel through the floor or seat, especially at highway speeds, can be caused by a bad U-joint throwing the driveshaft out of balance.
- Visible Rust Dust: If you see red or brown dust around the U-joint bearing caps, it's a sign that the internal needle bearings have turned to dust from lack of grease.
Choosing the Right Aftermarket U-Joint
For a vehicle like the 1986-1992 Comanche, new OEM parts from Mopar are likely discontinued or very hard to find. The good news is that the aftermarket offers excellent, and often superior, options. The key is to choose a quality brand. Here’s a breakdown of the available brands, tiered by quality based on owner experiences and brand reputation.
Brand Quality Tiers
| Tier | Brands | Description |
|---|---|---|
| Premium / Heavy-Duty | Dana Spicer, Yukon Gear | Dana Spicer is the original equipment manufacturer (OEM) for many Jeep components, and their U-joints are widely considered the gold standard for reliability and durability. They are a top choice for a stock replacement that you can trust. Yukon Gear offers high-strength U-joints, often designed for heavy-duty off-road use, making them a great upgrade for trucks that see tough conditions. |
| Quality Aftermarket | Moog, SKF | Moog is a well-known aftermarket brand with a reputation for quality suspension and driveline parts. They often feature improvements over the original design, such as grease fittings for easier maintenance. SKF is a global leader in bearings, and their U-joints are a solid, reliable choice for a daily driver. |
| Economy / Standard Replacement | Crown Automotive, GMB | Crown Automotive specializes in replacement parts for Jeeps and is a good source for hard-to-find components. Their quality is generally considered standard or budget-friendly, suitable for light-duty use. GMB is an economy brand that offers a low-cost alternative. While functional, they may not have the same longevity or strength as premium brands, with some users reporting mixed quality. |
Pro Tip: Greasable vs. Non-Greasable
You'll see options for both greasable (with a zerk fitting) and non-greasable (sealed) U-joints. Non-greasable joints, like the ones from Spicer, are generally stronger because the cross is solid metal. Greasable joints have channels drilled through them for grease, which can make them slightly weaker. However, if you stick to a regular maintenance schedule, greasable joints from a quality brand like Moog can have a very long service life. For most Comanche owners, a high-quality sealed joint from Spicer is a great "fit and forget" option.
Frequently Asked Questions (FAQ)
How many U-joints does my Jeep Comanche have?
It depends on your drivetrain. A 2WD Comanche has two U-joints on its rear driveshaft. A 4WD model has two on the rear driveshaft, two on the front driveshaft (plus a CV joint at the transfer case), and one in each front axle shaft by the wheels, for a total of six U-joints and one CV joint.
Do I need special tools to replace a U-joint?
While a hydraulic press is ideal, many mechanics and DIYers successfully use a ball joint press, a large C-clamp, or even a bench vise with a set of sockets. You will also need basic hand tools, a hammer, and snap ring pliers. Some auto parts stores offer ball joint press rental programs.
Is it difficult to replace a U-joint?
It's a moderately difficult job for a home mechanic. The main challenges are removing the old, often rusted, joint without damaging the driveshaft yoke, and carefully pressing the new caps in without dislodging the tiny needle bearings inside. Taking your time and watching a few tutorial videos can make the job much easier.
Should I replace all the U-joints at once?
If one U-joint has failed due to age and mileage, the others are likely not far behind. It is good practice to replace all the U-joints on a single driveshaft at the same time to save on labor and ensure a balanced, vibration-free result.
Were there any recalls for Jeep Comanche U-joints?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database and other records show no recalls or technical service bulletins (TSBs) specifically for universal joints on the 1986-1992 Jeep Comanche. Any failures are typically due to normal wear and tear over time.
Technical Specifications
OEM Part Numbers: 8126637
The most common U-joint sizes for the Dana 30 front axle shafts are the Spicer 260x and the larger, stronger 297x (also known as 760x). Driveshaft U-joints are typically a 1310 series. Always verify the correct part for your specific driveshaft or axle shaft before ordering.
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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.
- Jeep Comanche: