Matching Front and Rear Glass to the Discovery 4 Window Frame
Replacing the side window glass on this platform means dealing with a heavy, stamped-steel door sash that Land Rover carried forward directly from the earlier LR3. The front driver and passenger doors take single-pane tempered safety glass tinted in the standard factory solar-absorbing green, matching OEM references LR040917 for the left front and LR040916 for the right front. When sourcing aftermarket glass through NAGS, these correspond to DD10673 (or FD22463) on the driver side and DD10674 (or FD22462) on the passenger side. Across all Base, HSE, and HSE Lux trims, the front doors skip acoustic lamination entirely, utilizing single-sheet tempered glass designed to slide within the continuous perimeter glass run channel (part LR048818 on the left and LR048819 on the right).
I always check whether the replacement glass comes under the GTY or GTN suffix. A GTY-designated panel includes the pre-bonded bottom retention attachments from the factory, whereas a GTN panel arrives bare. Getting the pre-assembled version saves substantial labor because securing aftermarket clips to bare glass requires exact alignment to mate with the carrier clamps. Rear passenger doors bring a different layout altogether: the movable glass drops alongside a rigid vertical division bar that separates the roll-down panel from the stationary rear quarter vent glass, designated under NAGS DD10676 for the left rear and DD10675 for the right rear.
Regulator Mechanics, Retention Clips, and Door Shell Access
The interior architecture of these doors demands careful mechanical teardown before the glass can be swapped. The window relies on a twin-rail, cable-driven power regulator coupled to a reversible 12-volt motor. The glass rests inside nylon carrier blocks fastened by pinch bolts. Over time, road vibration and cycling cause the plastic carrier clips to fatigue, making them prone to snapping or causing the glass to ride crooked. When I install your replacement door glass, I back the panel with a one-year warranty while guaranteeing my installation workmanship for the lifetime of your ownership. The door shell requires unfastening the interior card, disconnecting the main switch packs, clearing the door speaker housing, and maneuvering through the inner steel service ports to access the pinch bolts holding the glass to the lifting cables.
If a cable has snapped or tangled in the drive spool—a widespread problem where the glass suddenly drops into the bottom of the door cavity—the glass panel and the regulator track must be aligned simultaneously. The framed window frame leaves virtually zero tolerance for an out-of-square fit. If the pane is tilted by even a few millimeters, it will wedge against the rubber run channel or bind, triggering the window motor's automatic anti-pinch safety reversal when rolling up.
