ACI 81977 Window Regulator - Front Left

Manual Window Regulator for Toyota Front Left

ACI 81977 is a new manual window regulator built for the front left door on select Toyota applications. It uses a hardened steel gear and meets or exceeds OEM requirements for a direct-fit replacement on manual window systems.

Compatible with 1984-1989 Toyota 4Runner and 1984-1988 Toyota Pickup, this ACI Window Regulator line part is a practical choice for restoring smooth glass movement on vehicles with a vent window setup. Part number 81977 is also referenced under several aftermarket cross numbers for the same application.

Key Features

• Manual window regulator for the front left position
• Hardened steel gear for durable gear engagement
• New construction
• Meets or exceeds OEM specifications
• Motor not included
• Mounting hardware not included
• Direct replacement for manual window service

Product Details

The ACI Window Regulator product line focuses on replacement door components built for accurate fit and dependable operation. This 81977 manual window regulator is made for Toyota 4Runner and Toyota Pickup models with manual front left window operation and vent window configuration. It is intended to restore proper crank-driven glass movement when the original regulator is worn, binding, or no longer holding the window correctly.

This part cross-references Continental WR40910 for the same application.

Common Problems It Can Solve

• Window crank turns but the glass does not move correctly
• Slow, uneven, or binding window travel
• Broken or stripped regulator gear teeth
• Loose or worn front left manual window mechanism
• Failure of the original regulator assembly in Toyota 4Runner or Toyota Pickup

Installation Notes and Tips

• Verify manual window operation and front left door fitment before installation.
• Transfer or source any required mounting hardware separately, since it is not included.
• Inspect the window tracks, rollers, and crank handle for wear before installing the new regulator.
• Test full up-and-down travel after installation to confirm smooth operation.

Quality Assurance

ACI 81977 is a new replacement part built to meet or exceed OEM specifications for the listed Toyota applications. The hardened steel gear supports consistent manual operation in regular door service.