Universal Two Window Power Window Kit - Specialty Power Windows

The Specialty Power Windows (SPW) Universal Two Window Power Window Kit (Power Wonder-Lift) is a turnkey cable-driven conversion kit engineered to replace manual crank handles and mechanical scissors regulators in hot rods, custom trucks, and classic car restorations. Operating with a compact under-glass clearance requirement of only 8-1/2 inches, this system utilizes a self-adjusting floating coined and slotted tube architecture that accommodates complex door curves and non-linear glass channels without motor binding.

System Architecture & Engineering Highlights

• Self-Adjusting Floating Tube Design: Utilizes SPW's patented floating coined and slotted metal guide tubes. Unlike rigid scissor-lift mechanisms that bind under slight misalignment, this assembly flexes and self-aligns dynamically as the glass travels along curved or angled door tracks.

• Compact Low-Clearance Profile: Requires only 8-1/2" of vertical clearance between the beltline (window sill) and the bottom of the door shell, making it suitable for chopped tops, shallow doors, or custom street rods with minimal internal cavity space.

• Extended Vertical Travel: Delivers up to 22 inches of continuous vertical glass travel, accommodating both short coupe side glass and tall vintage pickup truck windows.

• OEM-Grade High-Torque Motors: Driven by two modern OEM-style high-torque electric motors designed to handle heavy laminated or tempered glass with quiet, smooth ascent and descent.

• Complete Turnkey Electrical Package: Includes a pre-terminated wiring harness with motor disconnect plugs, GM-style chrome dash/door switches, and flexible stainless steel wire conduits to route power cleanly through the door jambs without pinching wires.

Technical Specification Matrix

Kit Contents Checklist

• Mechanical Regulators: (2) Cable-Driven Window Regulators with Floating Coined & Slotted Guide Tubes

• Drive Motors: (2) OEM-Style 12V High-Torque Power Window Motors

• Glass Mounting: (2) Universal Lower Glass Channels

• Electrical Controls: Complete GM-Style Chrome Switch Set (Driver Dual Bezel & Passenger Single Bezel)

• Wiring & Door Pass-Throughs: Pre-Wired Wiring Harness with Quick-Disconnect Plugs, (2) Stainless Steel Flexible Door Conduits

• Hardware & Documentation: Complete Mounting Bracket & Fastener Kit, Written Guide, and Instructional Video

Installation & System Notes

• Glass Attachment: Clean the lower edge of the window glass thoroughly before bedding 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.

• Door Jamb Conduit Routing: Drill door jamb holes at staggered heights (door vs. cowl/pillar) so the flexible stainless steel conduit forms a natural "S-bend" as the door swings shut. This prevents the conduit from pinching or kinking the internal electrical wires.

• Channel Alignment & Pre-Lube: Ensure the factory felt or rubber side glass run channels are intact, straight, and lubricated with dry silicone spray. The floating regulator absorbs track variation, but binding within dry or distorted perimeter channels will increase electrical motor load.

• Temporary Power Testing: Bench-test or use a jumper battery pack to run the glass up and down to check stop limits and clearance before reinstalling the interior door panels, vapor barriers, and armrests.
  

Instructions