Gates 90K-38178B Serpentine Belt Drive Component Kit

Accessory Belt Drive Kit for GM and Saab Applications

Restore the accessory belt drive system with this Gates Accessory Belt Drive Kit. The kit is built around an OE-equivalent belt and matching drive components to help maintain proper belt tracking, tension, and pulley operation on supported vehicles.

Gates 90K-38178B is a serpentine belt drive component kit for select Chevrolet Trailblazer, GMC Envoy XL, Buick Rainier, Saab 9-7x, Isuzu Ascender, and Oldsmobile Bravada applications. It is sized with a 90.873-inch outside circumference and a 20 mm belt top width for the listed fitments.

Gates Accessory Belt Drive Kit Details

• Brand: Gates Accessory Belt Drive Kit
• Part number: 90K-38178B
• Serpentine belt drive component kit for accessory belt system service
• Includes belt, tensioner, and idler pulley
• Belt 1 part number: K060905
• Tensioner assembly part number: 38178
• Idler pulley part number: 36227
• Outside circumference: 90.873 in. / 2308 mm
• Belt top width: 0.807 in. / 20 mm

Why Replace the Full Drive System

Accessory belt service is more effective when the belt, tensioner, and pulley are addressed together. Gates 90K-38178B is engineered as a complete serpentine kit to restore the front-end accessory drive on vehicles such as the Chevrolet Trailblazer and GMC Envoy XL, helping maintain consistent belt tension and pulley alignment across the system.

This part cross-references Dayco 5060905K2 for the same application.

Common Problems This Kit Can Address

• Squealing or chirping from the serpentine belt area
• Visible belt wear, cracking, or glazing
• Weak or inconsistent belt tension
• Idler pulley noise or rough rotation
• Accessory drive vibration or belt tracking issues

Installation Notes and Fitment

Compatible With 2005-2008 Saab 9-7x, N/A; 2004-2006 Buick Rainier, N/A; 2003-2006 Chevrolet Trailblazer, N/A; 2002-2006 Chevrolet Trailblazer EXT, N/A; 2002-2006 GMC Envoy XL, N/A; 2004-2005 GMC Envoy XUV, N/A; 2003-2005 Isuzu Ascender, N/A; 2002-2004 Oldsmobile Bravada, N/A.

Before installation, verify the belt routing and confirm the vehicle uses the listed 130A alternator application where noted. Gates includes installation instructions and tech tips with this kit to support accurate service of the accessory belt drive system.

Quality Assurance

Gates manufactures this kit as an OE-equivalent replacement for the listed applications, with components selected to service the complete serpentine drive rather than the belt alone. That approach helps support a more complete repair on supported GM and Saab vehicles.