Upgrade your classic GM Square Body with this 1974-87 Square Body Chevy & GMC Truck Power Window Kit, a complete system engineered for smooth, reliable, and factory style operation. Perfect for restorations, upgrades, or replacing worn out manual regulators, this kit includes everything you need for a modernized interior while keeping an OEM style fit and finish. Many also use this kit to switch your truck from a manual window to power windows.
Each kit comes with new regulators, ACI reverse polarity motors, switches, wiring harness, and conduit with it designed to bolt directly into the original mounting holes for a model specific installation. Unlike generic conversions, this kit uses the factory channels and works seamlessly with the curved glass used in 1970s and 1980s GM trucks.
Built to last, the regulators are made from 1018 cold-rolled steel with Bronze Oilite thrust bearings (Made in the USA) to keep pivots lubricated, while 4130 heat-treated gear plates deliver long tooth life and wear resistance. The included ACI motors provide reliable performance with controlled amp draws, and multiple power window switch options allow you to customize the look and function.
Installation is straightforward, and the system is protected by a lifetime warranty (sales receipt required). Whether you’re upgrading a driver or restoring a show truck, this power window kit delivers modern convenience, durability, and classic GM compatibility.
Key Features
- Fits 1974–1987 Chevy & GMC Square Body trucks, K5 Blazers, Jimmys, and Suburbans
- Complete kit: window glass regulators, ACI regulator motors, switches, harness, and conduit
- Bolt-in, model specific design to original no cutting or major modifications
- Works with factory curved glass
- 1018 cold rolled steel regulators with Bronze Oilite bushings for durability
- 4130 heat treated gear plates for longer tooth life
- New reverse polarity ACI motors with tested amp draws (3–20 amps)
- Uses stock channels for proper fit and function
- Multiple power window switch options available
- Includes inline 30 AMP fuse (circuit breaker optional)
- Lifetime warranty with proof of purchase
Installation Notes
- ACI motors require reverse polarity switches.
- For older 3-pole switches, a relay may be needed to reverse polarity.
- Use high-temp automotive grease on regulator gears and tracks for best performance.
- Apply dielectric grease to all terminals to protect against moisture and corrosion.
Bring modern reliability and comfort to your classic Chevy or GMC Square Body with this quality power window kit, designed for a perfect fit and lasting performance. You wanting fast windows upgrade to our heavy-duty harness 1977-1987 C10 Truck fast power window harness.
