How Rear Windows Differ from Windshields
The rope-in method works the same for rear windows, but there are important differences:
| Factor | Windshield | Rear Window |
|---|---|---|
| Curvature | Usually flatter | Often more curved (especially on sedans/hardtops) |
| Accessibility | Good access from inside | Rear seat/package tray may restrict access |
| Joint location | Bottom center | Top center (less visible, better water drainage) |
| Glass thickness | Typically standard | May vary by vehicle |
Materials Needed
Same as windshield installation:
- New rear window gasket
- Cotton rope (10-12 feet)
- Lubricant (dish soap mixture or Vaseline/lotion blend)
- Helper (essential for curved glass)
- Complete Installation Kit (GLK-1)
Step-by-Step Installation
Step 1: Access the Work Area
- Remove the rear seat bottom and seat back
- Remove package tray/rear speaker grille if applicable
- Remove any interior trim around the window
Step 2: Remove Old Glass and Gasket
- Cut away the rubber lip at the pinchweld edge using a sharp chisel or utility knife
- Push glass outward while helper supports from outside
- Remove all old gasket material
Step 3: Prepare Surfaces
- Clean and inspect the pinchweld (same as windshield)
- Address any rust or damage
- The rear window area is particularly prone to rust—treat thoroughly
Step 4: Mount Gasket to Glass
- Install gasket on the glass first
- For highly curved glass, work in sections and use extra lubricant
- Verify the gasket seats evenly all around
Step 5: Install the Rope
- Feed rope into the pinchweld channel
- Both rope ends should meet at the TOP CENTER of the window
- This positions the joint where it's least visible and promotes better water drainage
Step 6: Position and Rope In
- Set glass/gasket assembly into opening
- Working from inside (through trunk or interior), pull rope ends
- Work from top center down each side
- Helper maintains outward pressure on glass
Step 7: Final Seating
- Verify full gasket engagement around entire perimeter
- Apply sealant between glass and gasket if desired
Special Considerations by Vehicle Style
Hardtops & Fastbacks:
- Rear glass is often larger and more curved
- May require three people: one inside, two outside supporting glass
- Work slowly to prevent binding
Station Wagons & Hatchbacks:
- Access is usually through the rear cargo area
- Glass may be lighter but often has complex curves
Plymouth Belvedere, Coronet & Similar B-Bodies:
- These often have compound-curved rear glass
- Extra lubricant on the gasket is essential
- Some restorers warm the gasket with a heat gun for flexibility (use caution)
Troubleshooting
Glass sits too high/low:
- Gasket not fully seated in one area
- Use wooden tool to press lip over pinchweld
- Verify glass is centered in opening before final seating
Water leaks after installation:
- Apply sealer between glass and gasket channel
- Check for pinchweld damage or rust holes
- Ensure entire gasket lip is over pinchweld (no gaps)
Jan 8, 2026