A Practical Guide to Engine Mounts for the 1979-1987 GMC K1500
Stop that engine shake and clunking noise by choosing the right replacement mounts for your classic Square Body truck.
- Symptoms of failure include clunking noises, excessive vibration, and visible engine lift.
- Always inspect and consider replacing the transmission mount at the same time as the engine mounts.
- Choose standard rubber mounts (like Anchor or DEA) for a budget-friendly, quiet ride, but be aware of mixed reviews on longevity.
- Choose polyurethane mounts (like Energy Suspension) for heavy-duty use and durability, but expect more cabin vibration.
Is Your K1500's Engine Mount Failing?
After 40+ years of heat, vibration, and potential fluid leaks, the original rubber engine mounts on your GMC K1500 are likely worn out. The rubber becomes hard, cracked, or soft and oil-soaked, allowing the engine to move around excessively. Ignoring the signs can lead to more damage and a rough ride. Watch for these common symptoms:
- Excessive Vibration: You may feel a new or worsening vibration in the floor, seat, or throughout the entire cab, especially when idling in gear.
- Clunking or Banging Noises: A loud 'clunk' or 'thud' when you accelerate, brake, or shift from park into drive or reverse is a classic sign. This is the sound of the engine lifting and hitting the frame.
- Engine Movement: A quick visual check can confirm the problem. With a helper, set the parking brake, start the engine, and put it in drive while holding the brake. Briefly apply a small amount of throttle and watch the engine. If it lifts more than an inch or two, the mounts are bad.
- Exhaust Contact: On these trucks, a collapsed driver's side mount can allow the exhaust manifold to rest on or hit the frame, causing a very noticeable vibration and noise.
Check the Transmission Mount, Too
Your K1500 has two engine mounts and one transmission mount that work together. If your engine mounts have failed, the transmission mount has been under extra stress and is likely worn out as well. It is highly recommended to inspect and replace all three mounts at the same time for a complete repair.
Choosing the Right Aftermarket Engine Mounts
Since original GM parts are likely discontinued, the aftermarket is your go-to source. Your choice comes down to your budget and how you use your truck. For a 1979-1987 K1500, you have two main options:
Good: Standard Rubber Mounts
These are designed to be direct, factory-style replacements that restore the original ride quality. They provide good vibration absorption for a comfortable daily driver.
- Brands: Anchor, DEA, Westar, Pioneer
- Pros: Affordable, quiet, and comfortable ride.
- Cons: Forum discussions show mixed reviews on longevity. Some users report these brands can fail prematurely or have fitment issues, while others have used them without problems. They are not as durable as polyurethane, especially for heavy-duty use.
Better: Polyurethane Mounts
For trucks that are used for towing, off-roading, or have modified engines, polyurethane is a significant upgrade in durability.
- Brands: Energy Suspension
- Pros: Extremely durable and long-lasting. Resistant to oil, heat, and road grime. They will keep the engine locked down, improving throttle response.
- Cons: The main drawback is a noticeable increase in engine noise and vibration (NVH) felt in the cab. This is a trade-off for performance and strength.
Which is Best for You?
If your K1500 is a stock daily driver or you prioritize a smooth, quiet ride, stick with standard rubber mounts. If you use your truck for heavy work, have a high-horsepower engine, or want a fit-it-and-forget-it solution (and don't mind more vibration), polyurethane is the better long-term choice.
Cost of New Aftermarket Engine Mounts for 1979-1987 GMC K1500
| Part Type | Price Range (Per Mount) |
|---|---|
| Standard Aftermarket Rubber Mounts | $14.58 - $45.00 |
| Polyurethane Mounts | $50.00 - $83.39 |
| Estimated Shop Labor | $200 - $400 |
Frequently Asked Questions
How many engine mounts does my 1979-1987 K1500 have?
Your truck has two engine mounts, one on the driver's side and one on the passenger's side. It also has a single transmission mount at the rear of the transmission.
Can I replace just one broken mount?
It is strongly recommended to replace both engine mounts as a pair. If one has failed, the other is likely not far behind. Replacing them together ensures proper engine alignment and prevents the new mount from failing prematurely due to an old, worn-out mount on the other side.
Are the left and right engine mounts the same?
For this generation of GM truck, the left and right engine mounts are typically the same part number, using the factory "clamshell" style design. However, always verify the part fitment for your specific year and engine before ordering.
Is replacing engine mounts a DIY job?
Yes, for a mechanic with some experience. The process involves safely supporting the engine from below with a jack and a block of wood, removing the bolts, and lifting the engine just enough to swap the mounts. It requires proper tools and safety precautions, like using jack stands.
Technical Specifications
The standard mount for a small block V8 (like a 305 or 350) is often referred to by the part number 2292. These trucks use a two-piece "clamshell" design that bolts to the frame and the engine.
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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.
- 🛍️ Shop This Part
- Is Your K1500's Engine Mount Failing?
- Check the Transmission Mount, Too
- Choosing the Right Aftermarket Engine Mounts
- Good: Standard Rubber Mounts
- Better: Polyurethane Mounts
- Which is Best for You?
- Cost of New Aftermarket Engine Mounts for 1979-1987 GMC K1500
- Frequently Asked Questions
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