Gates 39455 Accessory Drive Belt Tensioner Assembly

OE Belt Tensioner for Lexus Accessory Drive Systems

The Gates DriveAlign Premium OE Automatic Belt Tensioner, part number 39455, is built for Lexus accessory drive belt systems that require precise belt control and stable tension. It is an OE Exact replacement engineered for consistent fit, form, and function on select Lexus IS350, IS300, RC300, RC350, GS350, and GS450h applications.

Key Features

• Steel tensioner assembly for durable accessory drive service
• OE Exact comparison rating for direct replacement fitment
• V-ribbed belt design with smooth/backside contact surface
• Single pulley layout with non-flanged pulley design
• Rigid manufacturing tolerances to match OE specifications
• Fits select Lexus models from 2015-2026, depending on application

DriveAlign Premium OE Design

Gates DriveAlign Premium OE Automatic Belt Tensioners are part of a product line focused on original-equipment system requirements. This tensioner is manufactured to OE-level dimensions and specifications, with a 70 mm outside diameter, 34 mm width, 17 mm bearing bore inside diameter, and three mounting holes. The result is a replacement tensioner that aligns with the accessory drive belt system used on select Lexus vehicles, including Lexus IS350 and Lexus RC350 applications.

This part cross-references Four Seasons 39455 for the same application.

Vehicle Fitment

• Fits 2019-2026 Lexus IS350, N/A
• Fits 2019-2023 Lexus IS300, N/A
• Fits 2019-2023 Lexus RC300, N/A
• Fits 2019-2023 Lexus RC350, N/A
• Fits 2015-2020 Lexus GS350, N/A
• Fits 2015-2018 Lexus GS450h, N/A
• Fits 2017-2018 Lexus IS300, N/A; Nov. 16, 2017 & Newer
• Fits 2017-2018 Lexus IS350, N/A; Nov. 16, 2017 & Newer
• Fits 2017-2018 Lexus RC300, N/A; Nov. 16, 2017 & Newer
• Fits 2017-2018 Lexus RC350, N/A; Nov. 16, 2017 & Newer

What It Helps Address

• Belt squeal caused by weak or inconsistent tension
• Accessory belt flutter or vibration during engine operation
• Uneven belt tracking on the V-ribbed drive system
• Wear from a tensioner that no longer maintains proper load
• Noise from a worn pulley or tensioner bearing assembly

Installation Notes and Tips

Verify the vehicle build date and application notes before ordering, especially for 2017-2018 Lexus IS300, IS350, RC300, and RC350 models with the Nov. 16, 2017 and newer note. Confirm pulley alignment, belt routing, and mounting-hole match before installation. Inspect the accessory drive belt and related pulleys at the same time so the new tensioner can operate within the correct belt path and load range.

Quality Assurance

Gates designs OE system components and manufactures this DriveAlign tensioner to rigid tolerances and specifications for OE fit, form, and function. Part number 39455 is built as an OE-style replacement for select Lexus accessory drive belt systems.