Dorman 740-878 Window Regulator - Rear Left

Reliable Window Regulator for Buick, Oldsmobile, and Pontiac

The Dorman 740-878 window regulator is designed to restore smooth electric window operation in select Buick Achieva, Oldsmobile Skylark, and Pontiac Grand Am models. Engineered with durable materials, this power window regulator offers a bolt-on installation solution for vehicles requiring a replacement part without a motor.

Key Features of the Dorman 740-878 Window Regulator

• Gear material constructed from plastic for consistent performance
• Frame made from a combination of metal and plastic for strength and durability
• Bolt-on attachment type ensures secure mounting
• Electric window operation compatible with factory power window systems
• Does not include motor, designed for use with existing or separately purchased motors
• Package contains one power window regulator unit

Detailed Product Description

The Dorman 740-878 window regulator is specifically engineered for electric window systems in Buick Achieva, Oldsmobile Skylark, and Pontiac Grand Am vehicles. Its plastic gear material reduces noise and wear, while the mixed metal and plastic frame provides a balance of rigidity and corrosion resistance. This regulator is designed for bolt-on installation, allowing for a straightforward replacement process. Note that this part does not include a motor or mounting hardware, so it is intended for users who already have these components or plan to source them separately.

Common Issues Addressed by This Window Regulator

• Window glass failing to move up or down smoothly
• Intermittent or non-functioning electric window operation
• Grinding or unusual noises during window movement
• Loose or unstable window glass alignment
• Wear or damage to the original window regulator mechanism

Installation Notes and Tips

Installation requires removal of the door panel and careful handling of the window glass. Since mounting hardware is not included, retain original bolts or acquire compatible fasteners before beginning installation. This part is designed for bolt-on attachment, which simplifies the replacement process but may require basic mechanical tools. Installation instructions are not included, so consulting a repair manual specific to Buick Achieva, Oldsmobile Skylark, or Pontiac Grand Am is recommended.

Quality Assurance and Warranty Information

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. While specific warranty details for part number 740-878 are not provided here, Dorman typically offers limited warranties covering defects in material and workmanship. For precise warranty terms, refer to Dorman’s official documentation or contact the parts distributor.