Belt & Accessory Drive

2010-2018 Dodge Ram 2500 & 3500 6.7L Cummins Heavy-Duty Accessory Belts, Idler Pulleys & Tensioners

Eliminate performance-robbing belt slippage, prevent sudden roadside belt failures, and bulletproof your front-end accessory drive (FEAD) system with premium 2010–2018 6.7L Cummins 4th Gen belts and pulleys from Full Force Diesel. The serpentine belt system on a 4th Generation Ram HD truck is responsible for driving multiple high-load accessories simultaneously, including the heavy-duty alternator, water pump, power steering pump, and A/C compressor. An inline-six diesel engine produces violent torque pulses and rapid RPM transitions that place immense stress on the factory rubber belt and plastic-molded pulleys. Upgrading to engineered, heavy-duty accessory hardware ensures absolute synchronization and reliable charging, cooling, and steering function under extreme work conditions.

Overcoming Factory Wear Points: Upgraded Idler Pulleys and Tensioners

The original factory accessory drive components are highly prone to wear and structural degradation over years of heavy service, leading to noise, misalignment, and catastrophic failures:

• Replacing Weak Plastic Pulley Wheels: Factory idler and tensioner pulleys frequently utilize molded plastic wheels wrapped around standard consumer-grade bearings. Under continuous under-hood thermal cycling, the plastic material can dry out, become brittle, and develop microscopic cracks that will chew through a serpentine belt or cause the wheel to shatter under load. Upgrading to precision-machined steel or billet aluminum replacement pulleys guarantees structural longevity and includes heavy-duty dual-bearing internals that run exceptionally smooth.

• Heavy-Duty Spring-Loaded Automatic Tensioners: The automatic belt tensioner relies on an internal steel spring to maintain uniform pressure against the serpentine belt. As the miles stack up, this internal spring fatigues and weakens, causing the tensioner arm to twist slightly out of alignment or bounce violently. A weak tensioner allows the belt to track crookedly, leading to premature edge wear, squealing, and full belt throw-offs. Heavy-duty replacement tensioner assemblies feature reinforced cast housings and upgraded spring packs to damp engine vibrations flawlessly.

Advanced Belt Technology: Eliminating Slip and Stretching

Standard cheap replacement belts stretch out quickly when subjected to the high-torque acceleration curves of a modified or working 6.7L Cummins common-rail engine:

• High-Tensile EPDM Serpentine Belts: Performance replacement serpentine belts are engineered from advanced Ethylene Propylene Diene Monomer (EPDM) synthetic rubber compounds. Reinforced with high-modulus aramid or polyester tensile cords, these heavy-duty belts resist stretching, dry-rotting, and cracking far better than standard chloroprene belts. They deliver unyielding grip across all accessory pulleys, maintaining maximum alternator output and water pump flow even at peak engine speeds.

• Complete Overhaul Accessory Kits: When refreshing a worn front-end accessory drive system, replacing just the belt is often a temporary band-aid if the bearings in the surrounding idlers are already dry or binding. We stock comprehensive belt and pulley refresh packages that bundle a new heavy-duty serpentine belt with matching replacement idlers and tensioner assemblies, allowing you to completely rebuild the mechanical integrity of your 4th Gen truck’s accessory drive stack all at once.

At Full Force Diesel, we provide the rugged, street-tested mechanical hardware and heavy-duty drivetrain accessories your 4th Gen inline-six needs to remain completely dependable. Explore our complete selection of 2010–2018 6.7L Cummins 4th Gen serpentine belts, heavy-duty automatic tensioners, steel idler pulleys, and complete front-end accessory drive component kits above to secure your engine's operations.