GMC G1500 Universal Joint Replacement Guide (1979-1985)
Don't let a bad U-joint leave your classic GMC G1500 van stranded.
- Prioritize quality brands like Dana Spicer for maximum longevity; they are consistently rated the best by other owners.
- Be prepared to use a torch to melt the plastic retainers on original factory U-joints before they can be removed.
- Decide between non-greasable joints for a maintenance-free solution or greasable joints if you plan to perform regular maintenance.
- Confirm the exact size (e.g., 1310 or 1330 series) and number of U-joints your van needs before ordering.
Is Your G1500's U-Joint Failing?
A failing U-joint gives clear warning signs. Ignoring them can lead to the driveshaft disconnecting from the vehicle, which can cause major damage and leave you stranded. Listen and feel for these common symptoms:
- Clunking Noise: A loud 'clunk' or ringing sound when you shift from Park into Drive or Reverse is a classic sign of a worn U-joint with too much play.
- Vibrations at Speed: A vibration that you can feel through the floor of the van, which gets worse at highway speeds, often points to a failing U-joint throwing the driveshaft out of balance. This can sometimes be mistaken for an unbalanced tire.
- Squeaking or Chirping: A rhythmic squeaking noise that starts at low speeds and changes with your speed is usually a dry U-joint that has lost its grease.
- Visible Rust or Grease: If you look under the van at the driveshaft, you might see rust-colored dust or grease splattered around the U-joint caps. This is a sure sign the seals have failed.
Original Factory U-Joints Require Heat
Be aware that many original GM U-joints from this era were not held in with snap rings. Instead, GM injected hot plastic into grooves to lock the bearing caps in place. To remove the original U-joints, this plastic must be melted out with a propane or MAP gas torch. The melted plastic will ooze out, and then the caps can be pressed out.
Choosing the Right Aftermarket U-Joint
For a vehicle like the G1500, investing in a quality U-joint is critical for reliability. Cheap parts are known to fail quickly, sometimes in less than two years. Here’s a breakdown of available brands:
- Premium / OEM-Grade (Dana Spicer): Spicer is the most recommended brand across owner forums and by professional mechanics. They were the original equipment manufacturer (OEM) for many vehicles and are known for durability and perfect fit. If you want to install it and forget about it, Spicer is the top choice.
- Quality Aftermarket (Moog, SKF): Moog and SKF are also well-regarded brands that offer heavy-duty options. Moog has a long history of making quality suspension parts, though some users note that quality can be inconsistent depending on the country of origin. SKF, especially their non-greasable "Brute Force" line, is another excellent choice praised for its strength.
- Standard Replacement (GMB): GMB is a common aftermarket brand that offers a reliable, budget-friendly replacement for a daily driver. While not considered as premium as Spicer, it is a viable option for standard use.
- Heavy-Duty / Performance (Yukon Gear): Yukon Gear specializes in drivetrain components built for high stress. While perhaps overkill for a standard G1500, a Yukon U-joint is a great option if you use your van for heavy towing or have a modified engine.
Greasable vs. Non-Greasable U-Joints
You will see options for both greasable (with a zerk fitting) and non-greasable (sealed) U-joints. There is a debate on which is better. Non-Greasable: These are often preferred because they have stronger, better seals from the factory. Brands like Spicer offer their "Life Series" which are sealed and designed to last the life of the vehicle without maintenance. Greasable: These can last a very long time, but only if you are diligent about greasing them regularly. The seals are designed to purge old grease, which also means they can let water and dirt in more easily if not maintained.
Aftermarket Universal Joint Cost for 1979-1985 GMC G1500
| Part Quality | Price Range (Per Joint) |
|---|---|
| Standard Replacement (GMB) | $18 - $35 |
| Quality Aftermarket (Moog, SKF) | $30 - $60 |
| Premium / Heavy-Duty (Dana Spicer, Yukon Gear) | $40 - $110 |
Frequently Asked Questions
How many U-joints does my 1979-1985 G1500 have?
Most G1500 vans have two U-joints: one connecting the driveshaft to the transmission and one connecting it to the rear axle. However, some long-wheelbase models may have a two-piece driveshaft with three U-joints and a center support bearing that will also need inspection. It is best to inspect your specific vehicle before ordering parts.
Can I replace U-joints myself?
Yes, this is a DIY-friendly job if you have the right tools and are comfortable working under your vehicle. You will need to remove the driveshaft. The most difficult part is pressing the old joints out and the new ones in. A bench vise, large sockets, and a hammer can work, but a U-joint press or ball joint press makes the job much easier and safer.
Do I need to balance the driveshaft after replacing the U-joints?
If you carefully mark the orientation of the driveshaft before removal and reinstall it the same way, balancing is not usually required for a simple U-joint swap. However, if you are still experiencing vibrations after the replacement, the driveshaft may be out of balance and should be taken to a specialty driveline shop.
What is a 1310 or 1330 series U-joint?
These numbers refer to the size of the U-joint. Different G1500 models and years could use different sizes, such as the 1310 or 1330 series. It is very important to measure your old U-joint's cap diameter and overall width or look up the correct part number for your specific van to ensure you buy the correct replacement.
Technical Specifications
Fitment is determined by the U-joint series, which defines the cap diameter and overall width. Common series for this era include 1310 and 1330. Original GM joints were often retained by injected plastic, while all aftermarket replacements use internal or external snap rings. Always measure or verify the correct series for your specific van's driveshaft before purchasing.
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.