Gates and Dayco are generally considered the top choices for the 6.7L Cummins serpentine belt, with OE-quality alternatives from Continental and Bando also reliable options.
The question centers on which belt brand delivers the best combination of fit, durability, and value for the 6.7-liter Cummins diesel used in many Ram trucks. The belt in question is the serpentine (accessory) belt that drives components such as the alternator, water pump (where applicable), power steering pump, and air conditioning compressor. Diesel engines run hotter and endure higher torque, so choosing a belt from a reputable brand matters for long-term reliability. The best choice often comes down to matching the belt to the engine’s exact specs and performing related maintenance on tensioners and pulleys during replacement.
Top brand options
These brands are trusted by technicians for reliable fit and durability on the 6.7 Cummins, and they cover OEM-style replacements as well as solid aftermarket options.
- Gates
- Dayco
- Continental
- Bando
Note: Some 6.7 Cummins installations use different belt configurations depending on the model year and trim level. Always verify the belt length, rib count, and width to ensure exact compatibility with your engine’s specifications.
Brand details
Gates and Dayco are frequently cited by mechanics as the go-to brands for heavy-duty diesel applications because of strong reinforcement, heat resistance, and wide availability. Continental and Bando are credible OE-style alternatives that offer reliable performance and good service life. The key is to select a belt that matches the engine’s specified rib count and length, and to pair it with a correctly functioning tensioner and idlers.
Choosing the right belt for your 6.7 Cummins
Before purchasing, confirm the exact belt specification for your truck (rib count, length, and width) and whether your configuration requires a single serpentine belt or a belt-and-tan response kit. Also consider replacing the tensioner and idler pulleys at the same time to maximize belt life and prevent premature wear.
- Match the belt to the exact spec (rib count and length) of your engine configuration
- Consider a complete belt kit that includes tensioner and idler pulleys
- Choose a reputable brand (Gates, Dayco, Continental, Bando) for durable, OEM-like performance
- Inspect the belt path and ensure proper alignment after installation
Replacing the belt with a high-quality brand and new tensioner/idlers helps prevent sudden failure, especially under heavy towing or work conditions common with 6.7 Cummins-powered trucks.
Maintenance tips to extend belt life
Routine checks and proactive maintenance can extend belt life and prevent roadside failures. Below are practical steps to help ensure reliable performance.
- Inspect the belt for cracking, glazing, or fraying at each service
- Check tensioner and idler pulleys for wobble, noise, or rough rotation
- Replace the belt and tensioner as a kit when signs of wear are present
- Ensure proper belt alignment and routing according to the factory diagram
Regular maintenance, especially on a high-torque diesel like the 6.7 Cummins, helps preserve accessory function and overall engine reliability.
Summary
For a 6.7 Cummins, Gates and Dayco are the leading aftermarket belt brands, with Continental and Bando offering solid OE-quality alternatives. The best choice depends on matching the exact belt spec for your engine and considering a full kit that includes the tensioner and idlers. Prioritize reputable brands, verify compatibility, and perform routine maintenance to maximize belt life and performance.
Is Dayco better than Continental?
The Dayco Question
Dayco claims that these unique qualities make their belts more durable than their competitors. In our experience, however, belts by INA,Gates and Continental are just as reliable through the full service interval.
Is OEM serpentine belt better than aftermarket?
The Verdict: OEM Serpentine Belts Are Better
OEM serpentine belts are usually a little more expensive than aftermarket belts. They offer much more value in the long haul, though, because: OEM serpentine belts always fit right. Aftermarket serpentine belts don't always fit right.
What is the best aftermarket belt brand?
For most shoppers, the best brands to consider when it comes to accessory belts are Gates, Dayco, Dorman, AC Delco, Litens, and Replacement. Why? These brands offer direct-fit replacements for many vehicle makes and models.
Which brand is best for belts?
- Hidesign.
- Woodland. Woodland, a brand synonymous with adventure and ruggedness, offers an impressive range of leather belts that complement their outdoor and casual wear collections.
- Titan.
- Louis Philippe.
- Van Heusen.
- Park Avenue.
- Fastrack.