ACI 83139 Power Window Motor - Front Left or Rear Left

Power Window Motor for Ford and Mercury

Restore front-left window operation with the ACI 83139 Power Window Motor. This power window motor is built for direct replacement use on select Ford and Mercury full-size vehicles, with fitment covering 1973-1978 Ford LTD, 1975-1978 Mercury Grand Marquis, 1974-1976 Ford Thunderbird, 1973-1974 Mercury Colony Park, and 1973-1974 Mercury Marquis.

ACI 83139 is a power-style window motor with installation instructions included, making it a practical choice for replacing a worn or non-functioning motor in the front left door or vent window application listed below.

Key Features

• Brand: ACI
• Part number: 83139
• Power window motor for front-left applications
• Installation instructions included
• Direct replacement for select Ford and Mercury models
• Cross-reference: StrongArm 4281

Product Details

The ACI Power Window Motor line is focused on replacement electrical components for vehicle glass and body systems. This ACI 83139 window motor is specified as a power type motor and is listed for front-left use on compatible Ford LTD, Mercury Grand Marquis, Ford Thunderbird, Mercury Colony Park, and Mercury Marquis applications. Fitment notes include a 7-tooth gear requirement on certain 1975-1978 Ford LTD applications and a mini vent application on 1974-1976 Ford Thunderbird models.

For buyers searching by vehicle, this part is a fitment-based solution for a Ford LTD front left power window motor, a Mercury Grand Marquis front left window motor, and a Ford Thunderbird front left mini vent motor. The ACI 83139 part number also appears in interchange listings for related replacement sourcing.

Common Problems This Part Can Address

• Window glass that will not move up or down from the switch
• Slow or intermittent front-left window operation
• Motor noise without window movement
• Failed motor after electrical power reaches the door assembly
• Restoring operation on a worn Ford LTD or Mercury Grand Marquis window system

Installation Notes and Tips

• Verify the vehicle year, make, model, and front-left position before ordering.
• Check the gear style note for 1975-1978 Ford LTD applications with a 7-tooth gear.
• Confirm the Thunderbird application note for mini vent fitment on 1974-1976 models.
• Inspect the regulator, switch, and wiring before installing the new motor.
• Use the included installation instructions during replacement.

Quality Assurance

ACI 83139 is a replacement power window motor built for the listed Ford and Mercury applications and supported by published interchange references, including StrongArm 4281. Confirm fitment against the vehicle’s original equipment details before installation.