Performance Drive Belt Tensioner Kit for GMC Sierra 2500 HD (2001-2002) 6.0L

Heavy-Duty Accessory Drive Belt Tensioner Kit for 2001-2002 GMC Sierra 2500 HD (GMT800)

What it Does: The Performance Drive Belt Tensioner Kit restores calibrated belt tension across the front accessory drive on the 2001-2002 Sierra 2500 HD to eliminate slip, damp torsional vibration, and prevent alternator drag.

The Stock GMC Sierra 2500 HD Tensioner Fatigue & Pulley Wear

Under heavy towing and high engine bay heat, factory spring-loaded tensioners on the GMT800 platform experience rapid dampening fluid loss and internal spring fatigue. On the Vortec 6.0L LQ4, this slack results in accessory belt whip, glazed ribbing, chirping, and underdrive slipping at the alternator—especially during peak electrical loads on models equipped with the factory 130 Amp charging system. Furthermore, OEM composite idler pulleys dry out their internal grease, leading to high-frequency bearing chatter and eventual seizure.

The Engineering Solution

This heavy-duty accessory drive overhaul kit replaces degraded OEM hardware with an application-specific spring-damped tensioner assembly (38158) paired with a precision-spun steel idler pulley (38001). Featuring sealed high-speed bearings resistant to thermal degradation, the assembly ensures low friction and zero axial runout. Coupled with a heat-resistant, crack-proof EPDM 6-rib serpentine belt (6PK2360), this kit stabilizes parasitic draw across the water pump, power steering, and charging loops under sustained load.

What's Included

• 1 Serpentine Belt (6PK2360)
• 1 Idler Pulley (38001)
• 1 Tensioner Assembly (38158)

Technical Specifications

Compatibility

• 2001 GMC Sierra 2500 HD 6.0L V8 (130 Amp Alternator)
• 2002 GMC Sierra 2500 HD 6.0L V8 (130 Amp Alternator)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT800 Sierra 2500 HD?

Yes, this is a direct fit for the 2001-2002 GMC Sierra 2500 HD equipped with the Vortec 6.0L LQ4 engine. This kit is exclusively for models equipped with the 130 Amp alternator option and does not fit 105 Amp systems, 8.1L gas engines, or 6.6L Duramax diesel applications.

How do I confirm my factory alternator amperage?

Check the glovebox Service Parts Identification sticker for RPO code KG8 (130 Amp) or verify the stamped amperage rating on the alternator rear housing prior to installation.

The GMC Heavy-Duty Caliber

Engineered for relentless commercial hauling and severe-duty towing cycles, this accessory drive kit delivers the mechanical durability and thermal resistance required to keep your GMT800 performing under maximum payload demands.