Universal Power Rear Window Kit - Specialty Power Windows

The Specialty Power Windows (SPW) Universal Power Rear Window Kit is a motorized conversion system engineered for custom builds, street rods, classic pickups, and station wagon restorations requiring smooth, vertical rear glass operation. Providing up to 9 inches of vertical lift, this kit is designed to route through factory drain troughs found in many original rear cab wall and tailgate structures, delivering dependable drop-down or roll-up rear window functionality.

System Architecture & Engineering Highlights

• 1018 Cold-Rolled Steel Construction: The regulator framework is fabricated from heavy-duty 1018 cold-rolled steel to maintain structural rigidity, resist flexing under vertical load, and ensure positive glass tracking.

• New ACI Drive Motor: Powered by a brand-new, high-torque ACI electric motor engineered for quiet, dependable operation and sufficient power to lift heavy rear glass assemblies.

• 9-Inch Maximum Vertical Lift: Delivers up to 9 inches of travel, sized specifically to fully clear rear cab windows in vintage trucks or retractable rear partition glass in custom cars and wagons.

• Factory Drain Trough Clearance: Engineered to route through existing factory drain troughs on many vintage cabs and body styles, preserving water-drainage pathways while keeping the mechanical drive concealed.

• Dedicated Lower Glass Channel: Supplied with a new, heavy-duty lower glass channel to ensure a secure foundation, even glass support, and binding-free travel along side tracks.

Technical Specification Matrix

Kit Contents Checklist

• Mechanical Regulator: (1) Heavy-Duty 1018 Cold-Rolled Steel Rear Window Regulator

• Drive Motor: (1) New ACI High-Torque 12V Power Window Motor

• Glass Mounting: (1) New Lower Rear Glass Channel

• Controls & Electrical: (1) Power Window Switch, Dedicated Wiring Harness with Motor Connectors

• Hardware & Documentation: Installation Fasteners, Brackets, and Complete Instruction Guide

Installation & System Notes

• Glass Channel Bedding: Clean the bottom edge of the rear glass thoroughly before seating it into the supplied lower glass channel using professional auto glass setting tape or high-strength urethane adhesive. Ensure the glass sits fully level across the channel base prior to final curing.

• Drain Trough Alignment: When positioning the regulator assembly along the rear cab wall or inner gate, verify that the drive arms clear the factory drain trough so water run-off remains unobstructed.

• Track Lubrication & Alignment: Ensure side glass run channels are square, parallel, and lubricated with dry silicone spray to prevent glass skewing and reduce motor amp draw during vertical travel.

• Pre-Trim Function Testing: Wire the switch temporarily to a 12V power source to cycle the window through its full 9" travel range, confirming upper and lower stops before reinstalling rear interior panels or upholstery.

Instructions