Performance Drive Belt Tensioner Kit for Chrysler 300 (2011-2020) 3.6L

Heavy-Duty Performance Drive Belt Tensioner Kit for 2011-2020 Chrysler 300 (LD)

What it Does: The Performance Drive Belt Tensioner Kit restores correct accessory drive tension and eliminates belt slip across the alternator, water pump, and compressor on the 2011-2020 Chrysler 300 3.6L Pentastar.

The Stock Chrysler 300 Belt Drive Weakness

Factory belt tensioners on the LD chassis utilize cast internal damping springs that suffer from severe fatigue under sustained thermal cycling. Over mileage, dampening loss allows belt flutter, leading to dynamic misalignment and premature accessory bearing failure. Compounding the issue, the OEM composite idler pulleys develop bearing play and micro-groove scoring, resulting in high-frequency belt squeal, edge fraying, or thrown belts during aggressive high-RPM downshifts on the 3.6L Pentastar.

The Engineering Solution

This direct-replacement refresh kit stabilizes accessory drive harmonics and restores steady tension load under harsh operating conditions. Featuring a heavy-duty tensioner assembly engineered with high-durability internal springs, it actively resists dampening breakdown. Paired with dual heavy-duty idler pulleys packed with premium high-speed radial bearings and a durable 6PK1670 EPDM serpentine belt resistant to rib separation and cracking up to 250°F, this assembly delivers consistent traction without parasitic drag.

What's Included

• 1x Serpentine Belt (6PK1670)
• 1x Tensioner Assembly
• 2x Idler Pulleys

Technical Specifications

Compatibility

• 2011-2020 Chrysler 300 3.6L V6 (Limited, S, Touring, Base trims)
• Configured strictly for 3.6L Pentastar accessory belt paths requiring 6PK1670

Frequently Asked Questions & Fitment Warnings

Does this fit the LD 300?

Yes, this is a direct fit for the 2011-2020 Chrysler 300 equipped with the 3.6L Pentastar engine. This kit does not fit 5.7L HEMI or 6.4L SRT8 V8 engine configurations.

How do I verify the serpentine belt length is correct?

Verify that your existing accessory belt configuration calls for a 6-rib, 1670mm effective length (6PK1670) prior to installation.

The Chrysler Muscle Sedan Caliber

Built to handle the demanding loads and extended high-speed cruising typical of the full-size Chrysler LD platform, keeping vital engine cooling and charging systems functioning without slip.