GMC C1500 Universal Joint Replacement Guide for 1979-1987 Models
That clunking or squeaking noise from under your truck is likely a worn-out U-joint; here's how to choose the right replacement.
- The most common failure symptom is a 'clunk' when shifting into gear or a squeak at low speeds.
- Before ordering, check if your original U-joints have injected plastic retainers that need to be melted out.
- Verify your U-joint size (bearing cap diameter) and lock ring style (inside or outside) to ensure you buy the correct part.
- For maximum durability and peace of mind, Dana Spicer is the most recommended brand by experienced owners.
Is Your C1500's U-Joint Failing?
Universal joints are wear-and-tear items. On a classic truck like the 1979-1987 GMC C1500, it's common for them to need replacement. Listen and feel for these tell-tale signs of a bad U-joint:
- Clunking Noise: A distinct "clunk" or ringing sound when you shift from park into drive or reverse is a classic symptom. This is caused by excessive play in the worn joint.
- Squeaking Sound: A repetitive squeaking that matches your speed, especially noticeable when first starting to move, points to a dry, failing U-joint. The sound may disappear at higher speeds due to road noise.
- Vibrations: A vibration you can feel through the floor or seat while driving, particularly at highway speeds, can be caused by a worn and unbalanced U-joint.
Special Note for Original U-Joints
If your truck still has its factory-installed U-joints, be aware that they were often secured with injected nylon or plastic instead of metal snap rings. You will see no clips on the outside or inside of the yoke. To remove these, the plastic must be melted out using a propane or MAP gas torch until it oozes out. Only then can the old joint be pressed or hammered out. Aftermarket replacements will use traditional snap rings.
Choosing the Right Aftermarket U-Joint
Not all aftermarket U-joints are created equal. For your C1500, brands generally fall into three quality tiers. Your choice depends on your budget and how you use your truck.
Tier 1: Premium & Heavy-Duty
These brands are for owners who want maximum durability, are doing heavy towing, or simply want the best part available. They often meet or exceed original equipment quality.
- Dana Spicer: Widely considered the gold standard by mechanics and experienced truck owners. Spicer parts are known for excellent quality control, strength, and long life. Many prefer their non-greaseable (solid) joints, which are believed to be stronger and last longer than greaseable versions. If you want to install it and forget it, Spicer is the top choice.
- Yukon Gear & Axle: Known for high-performance and off-road parts. They offer extremely strong Chromoly "Super Joints" for heavy-duty use, but these require frequent greasing and are not ideal for a daily driven street truck. They also offer more conventional high-quality U-joints that are a solid choice for demanding applications.
Tier 2: Standard & OE-Quality
These brands offer a good balance of quality and price for a daily driven or light-duty truck.
- Moog: Once a top-tier brand, Moog's reputation is now more mixed. While they still produce reliable parts, some users report inconsistent quality. They are a decent mid-range option, and their U-joints are typically greaseable for easy maintenance.
- SKF: A well-respected bearing manufacturer, SKF offers quality driveline parts. There is less forum discussion about them for this specific truck, but they are generally seen as a reliable alternative to Moog and a step up from economy brands.
Tier 3: Economy
These brands meet basic requirements and are the most budget-friendly. They are suitable for light-use vehicles where cost is the primary concern.
- GMB: An economy-focused brand that provides a functional replacement at a low cost. While not known for high performance or extreme durability, a GMB joint will get your truck back on the road.
Common Ordering Mistake: Check Your Size!
The 1979-1987 C1500 could be equipped with different driveshafts. This means there are different U-joint sizes and styles. Before ordering, you must confirm if your driveshaft uses U-joints with outside lock rings (Spicer style) or inside lock rings (GM style). You should also measure the diameter of the bearing caps to ensure you get an exact match. Taking the old part to the store to match it visually is a good strategy.
Aftermarket U-Joint Cost for 1979-1987 GMC C1500
| Part Category | Estimated Cost |
|---|---|
| New Aftermarket U-Joint | $18.53 - $237.75 |
| Shop Labor for Replacement (1-2 joints) | $200 - $450 |
Frequently Asked Questions
Should I get a greaseable or non-greaseable U-joint?
This is a topic of debate. Greaseable joints (like most from Moog) have a zerk fitting that allows you to add fresh grease, which can flush out contaminants and extend life if done regularly. However, the channel drilled for the grease makes the joint slightly weaker. Non-greaseable joints (like many from Spicer) are sealed from the factory and have a solid cross-body, which many experts believe is stronger and lasts longer without any maintenance. For most stock C1500s, either is fine, but for heavy use, many prefer the strength of a non-greaseable Spicer.
How many U-joints does my C1500 have?
Most standard wheelbase C1500s have a one-piece driveshaft with two U-joints: one at the transmission and one at the rear axle. However, long-bed models may have a two-piece driveshaft, which uses three U-joints and a center support bearing. It is best to inspect your truck to confirm the configuration.
Is the "clunk" when I shift into gear always a U-joint?
While a bad U-joint is the most common cause of this clunking sound, it's not the only possibility. Excessive backlash in the rear differential gears or a worn transmission mount can also cause similar noises. However, the U-joint is the easiest and most likely component to check first.
Are there any recalls for my truck's U-joints?
Searches of the National Highway Traffic Safety Administration (NHTSA) database did not show any open recalls for driveshafts or universal joints specifically for the 1979-1987 GMC C1500 model years. Recalls found were for much newer GM models.
Technical Specifications
Various sizes exist. Key dimensions to verify are bearing cap diameter and whether the joint uses inside or outside lock rings (snap rings). Common cap diameters include 1-1/16", 1-1/8", and 1-3/16".
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.
- 🛍️ Shop This Part
- Is Your C1500's U-Joint Failing?
- Special Note for Original U-Joints
- Choosing the Right Aftermarket U-Joint
- Tier 1: Premium & Heavy-Duty
- Tier 2: Standard & OE-Quality
- Tier 3: Economy
- Common Ordering Mistake: Check Your Size!
- Aftermarket U-Joint Cost for 1979-1987 GMC C1500
- Frequently Asked Questions
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