Accessory Drive Belts for the 1975-1978 GMC G35 Van
Here is what you need to know about the multiple V-belts that run your van's essential accessories.
- Your 1975-1978 GMC G35 uses multiple V-belts, not a single serpentine belt. You will need to purchase a set of belts.
- Squealing noises are the most common sign of a failing belt. Do not ignore them.
- Visually inspect all belts for cracks and wear. It is best practice to replace all belts at the same time.
- Premium aftermarket brands like Gates, Dayco, and Continental are reliable choices for these vans.
Understanding Your G35's V-Belt System
Unlike modern vehicles that use a single, flat, ribbed serpentine belt, your classic GMC G35 uses a set of older-style V-belts. These belts get their name from their trapezoidal or "V" shape, which helps them grip the pulleys. Because your van has multiple accessories, it requires multiple V-belts. This is a critical point to understand when ordering parts, as you will likely need to purchase several different belts, not just one.
Symptoms of a Failing Accessory Drive Belt
When a V-belt starts to fail, it gives you several warning signs. Ignoring them can leave you stranded. Here’s what to look and listen for:
- Squealing Noises: This is the most common symptom. A high-pitched squeal, especially when you start the engine or accelerate, often means a belt is loose, worn, or glazed.
- Visible Wear and Tear: Inspect your belts. If you see cracks, fraying, splitting, or pieces missing, it's time for a replacement. A shiny or glazed appearance on the sides of the belt also indicates it's worn out.
- Accessory Malfunctions: If your power steering becomes heavy, your battery light comes on, or your engine temperature starts to climb, a belt may have failed. A broken belt means the component it drives has stopped working.
- Vibrations or Rattling: A damaged or improperly tensioned belt can cause vibrations and unusual noises from the front of the engine.
Aftermarket V-Belt Cost for 1975-1978 GMC G35
| Brand Tier | Price Range (Per Belt) | Notes |
|---|---|---|
| Premium Aftermarket (Gates, Dayco, Continental) | $10 - $40.28 | Recommended for durability and reliability. Often feature advanced rubber compounds and cord construction for longer life. |
| Standard Aftermarket | $2.60 - $15.00 | A budget-friendly option that meets basic requirements. May not have the same lifespan as premium brands. |
Choosing the Right Aftermarket Belts
For a vehicle as old as the 1975-1978 G35, OEM belts from GM are no longer available. The good news is that the aftermarket offers excellent, high-quality V-belts from reputable brands like Gates, Dayco, and Continental. All three are well-regarded manufacturers that supply parts to carmakers directly. Gates is often praised for its durability and is a popular choice among mechanics. Dayco and Continental also produce reliable belts that meet or exceed original specifications. Given the critical function of these belts, it is wise to invest in a premium brand for peace of mind.
Pro Tip: When replacing one belt, it's a good practice to inspect all the other belts. Due to the age of the vehicle and the similar wear cycles, it's often cost-effective to replace all the accessory drive belts at the same time. This saves you from having to do the job again in a few months when another old belt fails.
Frequently Asked Questions (FAQ)
How many accessory belts does my 1975-1978 G35 have?
The exact number depends on your van's specific engine and options (like with or without A/C and power steering). Most will have between two and four separate V-belts. It is essential to check your specific setup or consult a parts diagram to ensure you buy the correct number and sizes of belts.
Can I replace just one bad belt?
Yes, you can replace just the one that failed. However, since all the belts are of a similar age and have been exposed to the same conditions, the others are likely nearing the end of their life too. Replacing them all at once is a recommended preventative measure.
What's the difference between a V-belt and a serpentine belt?
V-belts are narrower, V-shaped belts used in older vehicles, with multiple belts driving different accessories. A serpentine belt is a single, wide, flat, ribbed belt that snakes around all the pulleys to power everything. Your G35 uses the older V-belt system.
How difficult is it to replace the belts myself?
For a DIY mechanic with some experience, replacing V-belts is a manageable job. The process involves loosening the accessory (like the alternator or power steering pump), removing the old belt, installing the new one, and then properly tensioning it by prying the accessory back before tightening the bolts. Proper tension is key; too loose and it will slip, too tight and it will damage the bearings of the accessory.
Technical Specifications
The system uses multiple V-belts of varying lengths. The exact size and quantity depend on the engine and accessories equipped (e.g., with or without A/C). Belts are identified by part numbers and dimensions (length and width).
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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.