Upgrade your Peterbilt 379 with the Gates Micro-V K121039 Serpentine Belt, available now at Partshawk.com. This high-performance Micro-V Serpentine Drive Belt is engineered to meet or exceed all Original Equipment Manufacturer (OEM) specifications, ensuring your vehicle runs smoothly and efficiently. Crafted from durable EPDM rubber, this belt resists cracking on the rib surface, providing long-lasting reliability and performance. Whether you're a B2C customer looking to maintain your truck or a B2B client seeking dependable parts for your fleet, this serpentine belt is the perfect choice. The Gates Micro-V K121039 is designed to eliminate belt noise, reduce tension loss, and solve problem drive applications, making it an essential component for your Peterbilt 379. With a polyester cord material and a 12-ribbed design, this belt offers superior strength and flexibility. The effective length of 103.94 inches (2640 mm) and an outside circumference of 104.5 inches (2654 mm) ensure a precise fit for your fan and alternator system. For optimal performance, it is recommended to replace the tensioner if equipped. Trust Gates for OE performance and quality. The Micro-V Serpentine Drive Belt is a standard automotive V-ribbed belt that guarantees optimal vehicle performance. Whether you're dealing with import or domestic vehicles, cars, or trucks, Gates' precision-fit Micro-V belts are the industry standard for reliability and efficiency. Shop now at Partshawk.com and keep your Peterbilt 379 running at its best with the Gates Micro-V K121039 Serpentine Belt.

Import or domestic, car or truck, every vehicle can depend on the superior quality of Gates precision-fit Micro-V belts. With advanced technology that matches the OE size, construction and materials, Gates Micro-V ensures optimal vehicle performance.

• High-Performance Gates Micro-V K121039 Serpentine Belt for Peterbilt 379: Crafted with durable EPDM rubber to resist cracking and ensure long-lasting performance.
• OE Quality Assurance: Meets or exceeds all Original Equipment Manufacturer specifications, guaranteeing a perfect fit and reliable operation for your Peterbilt 379.
• Advanced Belt Construction: Specially designed to eliminate belt noise, reduce tension loss, and solve problem drive applications, ensuring smooth and quiet operation.
• Optimal Performance with Polyester Cord Material: The robust polyester cord material enhances strength and durability, making it ideal for heavy-duty applications.
• Comprehensive Fitment: Suitable for 2005-2007 Peterbilt 379 models, specifically designed for fan and alternator positions with a 12-ribbed belt configuration.

Cord Material:	Polyester
Cross Section Designation:	K
Effective Length:	103.94
Effective Length:	2640
OE Comparison Rating:	OE Performance
Outside Circumference:	104.5
Outside Circumference:	2654
Rib Quantity:	12
Top Width:	1.647
Top Width:	42
Type:	Automotive V-Ribbed Belt (Standard)
Washer Pump Included:	EPDM

• ACDelco: 12K1039
• ACDelco: K121039HD
• CARQUEST: K121039
• Carquest: K121039HD
• Continental Belt: 4121040
• Continental Belt: 1040K12MK
• Cummins: 3103848
• Dayco: 5121040
• Dayco: 1128K12
• Dayco: 1040K12
• Dynacraft: D11065222
• Dynacraft: D11085222
• Dynacraft: D1108D8410003122640
• Dynacraft: D8410003122640
• Dynacraft: 4121039RP
• Goodyear: 4121040
• Goodyear: 4121039
• HD Value: 12K1039HDV
• Metric: 12PK2640
• NAPA Belts/Hose: 25-121039
• NAPA Belts/Hose: 25-121039HD
• Size Designation: 12PK2640

• 2005-2007 Peterbilt 379 | Position: Fan and Alternator | Note: W/12-Ribbed Belt