Back Glass Lift Support

What Is a Back Glass Lift Support?

Back glass lift supports — also called rear window struts or glass lift struts — are the gas-charged cylinders that hold the rear window glass open on SUVs, crossovers, and hatchbacks equipped with a separately hinged back glass panel. Distinct from the full liftgate, this small pane of glass swings open independently, giving drivers quick access to the cargo area without having to raise the entire tailgate assembly.

Back glass lift supports work on the same principle as hood and hatch supports. Lift supports are pressurized cylinders that are used to support hoods, hatches, and rear window glass in automotive applications, relying on compressed nitrogen gas to extend the cylinder and hold the glass in place against gravity. Over time, these cylinders slowly lose pressure — on average, lift supports lose approximately 3% of their holding power annually, a rate that can accelerate in extreme cold or heat. Once a back glass strut begins to fail, the window may feel heavy to raise, hold itself open for only a moment, or drop unexpectedly — a genuine safety hazard.

Signs You Need to Replace Your Back Glass Lift Supports

• The rear window glass falls shut on its own instead of staying up
• You have to manually prop the glass open or hold it while loading cargo
• The glass feels unusually heavy or stiff when opening
• Visible oil residue or physical damage on the strut body

Experts generally recommend replacing lift supports in pairs, even if only one appears to be failing. Because both struts age at the same rate, installing a single new strut can create uneven pressure and cause the glass to open crookedly. Additionally, each lift support is vehicle-specific — extended length, stroke, and mounting hardware vary by year, make, and model, so always verify fitment before purchasing.

Top Brands for Back Glass Lift Supports

When it comes to replacement back glass lift supports, a handful of trusted names consistently stand out for quality and coverage:

• StrongArm — The dominant name in the aftermarket lift support segment, StrongArm has pioneered the gas spring market and serves as a leading OEM supplier in collaboration with engineers from major automakers. Their struts feature hardened chromium-plated steel shafts, self-cleaning piston assemblies, and patented temperature compensation module valves for consistent performance in all climates — and they're designed to install in minutes with basic hand tools.
• FCS — FCS Automotive International is a fully vertically integrated manufacturer that designs and produces lift supports to meet or exceed OE quality specifications, with over 60 full-time engineers backing their product development. Their lift supports are engineered for superior corrosion resistance and improved oil and gas pressure seating for long-term reliability.
• Sachs — A globally respected name in chassis components, Sachs (now part of the ZF family and related to the Stabilus brand) has a strong reputation as an OE supplier across numerous vehicle platforms. Enthusiasts and technicians frequently cite Sachs lift supports for their precision engineering and consistent long-term performance.
• Tuff Support — Tuff Support offers a broad range of lift support options including their BB (Black), SS (Stainless), and BC (Black/Chrome) series, providing buyers with multiple finish and durability options to match their needs and budget. Their direct OE-fit design philosophy ensures straightforward installation without modifications.

Shopping Tips for Back Glass Lift Supports

Always confirm the compressed length, extended length, and end fitting type of the strut match your vehicle's specifications. If your vehicle has an integrated defrost grid or antenna in the back glass, make sure the replacement strut is rated for the correct weight. When in doubt, use a year/make/model lookup to find an exact-fit part — and replace both struts at the same time for balanced, safe operation.