Gates 38777 Accessory Drive Belt Tensioner Assembly

OE Belt Tensioner for Toyota and Lexus

The Gates DriveAlign Premium OE Automatic Belt Tensioner, part number 38777, is built for accessory drive belt systems that need consistent belt control and OE-style fit. It is a steel automatic belt tensioner assembly with a single smooth/backside pulley, made to match the original mounting and operating requirements on select Toyota and Lexus applications.

Gates applies its OE system design experience to the DriveAlign Premium OE Automatic Belt Tensioner line, focusing on rigid manufacturing tolerances, correct fit, and dependable belt tracking. This 38777 tensioner is a direct replacement choice for vehicles such as the Toyota Camry, Tacoma, Highlander, Sienna, Avalon, and Lexus RX350, RX350L, and ES350.

Key Features

• Gates DriveAlign Premium OE Automatic Belt Tensioner
• Part number 38777
• Steel tensioner assembly for accessory drive belt systems
• OE Performance grade for original-style fit and function
• Single pulley design with smooth/backside running surface
• V-ribbed belt application
• Two mounting holes for OE-style installation points
• Pulley dimensions: 2.75 in. outside diameter, 1.31 in. width
• Bearing bore inside diameter: 0.67 in. / 17 mm

Detailed Description

The Gates 38777 automatic belt tensioner is engineered for accessory drive belt system service where stable belt tension and accurate pulley alignment matter. Its steel construction, OE Performance grade, and single smooth/backside pulley support proper operation in V-ribbed belt systems. Gates manufactures the DriveAlign Premium OE Automatic Belt Tensioner line to rigid tolerances so the part matches OE fit, form, and function on the listed Toyota and Lexus vehicles. If you are replacing a worn Toyota Camry belt tensioner or servicing a Lexus RX350 accessory drive belt system, this assembly provides the correct style of replacement.

This part cross-references Dayco 89743 for the same application.

What It Helps Address

• Belt squeal caused by weak or inconsistent tension
• Visible belt flutter or belt tracking issues
• Accessory drive belt slippage
• Noise from a worn tensioner pulley or bearing
• Loss of proper belt tension in the engine accessory drive system

Installation Notes and Tips

• Verify the vehicle application before installation using the exact year, make, and model.
• Inspect the accessory drive belt, idler pulleys, and related components during replacement.
• Confirm the pulley style matches the existing V-ribbed belt routing and backside contact surface.
• Check mounting hole alignment and belt tracking after installation.
• For best results, replace a worn belt at the same time if inspection shows glazing, cracking, or uneven wear.

Quality Assurance

Gates is a global OE system designer, and the DriveAlign Premium OE Automatic Belt Tensioner line is manufactured to OE-quality standards with controlled tolerances for fit and performance. This Gates 38777 tensioner is built to deliver the same style of original-equipment service expected in Toyota and Lexus accessory drive belt applications.

Compatible With: Fits 2019-2025 Lexus ES350, N/A; Fits 2018-2024 Toyota Camry, N/A; Fits 2016-2023 Toyota Tacoma, N/A; Fits 2016-2022 Lexus RX350, N/A; Fits 2018-2022 Lexus RX350L, N/A; Fits 2019-2022 Toyota Avalon, N/A; Fits 2017-2022 Toyota Highlander, N/A; Fits 2017-2020 Toyota Sienna, N/A.