Trunk Lid Lift Support

When your factory trunk struts wear out, lose pressure, or fail during cold winter days, your trunk lid becomes incredibly heavy and prone to slamming down without warning. This isn’t just an inconvenience—it’s a severe safety hazard when you are loading groceries, luggage, or tools. You don’t need to pay expensive mechanic labor rates or deal with an unsafe trunk. With GASTAC high-quality, Direct-Fit Trunk lid lift Supports, you can completely restore new-car smoothness, reliable lifting power, and hands-free safety in less than 5 minutes.

What are Trunk Lid Lift Supports?

Trunk Lid Lift Supports (also commonly known as trunk lift struts, dampers, or gas shocks) are small, specialized hydropneumatic components that assist in opening, supporting, and closing a vehicle’s rear trunk lid. They are direct-fit hardware components consisting of a sealed, high-pressure nitrogen-filled cylinder and a sliding piston rod. They connect directly to the vehicle’s frame and trunk chassis via specific ball-and-socket joints.

Common Signs of Failed Trunk Lift Supports

When your trunk lid lift supports begin to fail or lose internal pressure, they will exhibit several distinct warning signs. Here are the most common signs of failure to look out for:

• Trunk Lid Won’t Stay Open: The most frequent and obvious indicator; after opening the trunk, the lid completely fails to hold its position and falls back down immediately.
• Trunk Lid Slowly Drops Down: The struts have lost partial pressure, allowing the trunk lid to stay open temporarily before it slowly and unexpectedly creeps down on its own.
• Trunk Feels Heavy to Lift: Because the gas springs are no longer assisting with the vehicle’s structural weight, you have to use significant physical effort to force the trunk lid open.
• One-Side Failure Overload: If one strut fails entirely, the remaining side becomes completely overloaded, causing the trunk to lift unevenly, feel heavy, or warp during operation.
• Poor Performance in Cold Weather: The trunk drops or fails specifically during winter or cold days, as low temperatures cause the internal gas to contract and lose necessary lifting force.
• Visible Oil or Gas Leaks: You notice greasy hydraulic oil residue leaking out of the cylinder seals or dripping down the polished piston rod, signaling that the internal seal system has cracked or worn out.

Why Trunk Lift Supports Fail?

Trunk lift supports are sealed, pressurized hardware components that gradually lose performance and structural integrity due to the following specific mechanical factors:

• Natural gas pressure loss over time: High-pressure gas naturally escapes from the cylinder over years of use.
• Internal seal wear and aging: The internal seals degrade, crack, and wear down over time, causing leaks.
• Temperature fluctuations affecting gas pressure: Continuous changes in temperature alter the internal pressure, with extreme conditions accelerating failure.
• Corrosion from moisture and road conditions: Moisture and road salt trapped in the trunk channels cause rust and surface damage to the metal components.
• High-cycle fatigue from repeated opening and closing: Constant, repeated daily use creates mechanical fatigue on the internal structural parts.
• Poor-quality aftermarket sealing systems: Low-quality replacement parts utilize subpar seals that fail prematurely and cannot hold pressure.

OEM Trunk Lid Lift Supports Specification Sheet

OEM	Photo	Rod / Tube Ø	Stroke	Extended Length	Force	Year
5C6827550		8 / 18 mm	150 mm	490 mm	110N	VW JETTA 2010 – 2018
51247259763		8 / 18 mm	145 mm	375 mm	120N	ALPINA B3 2013 – 2018
3C5827550C		8 / 18 mm	145 mm	375 mm	390N	VW PASSAT 2005 – 2010
51241960862		8 / 18 mm	80 mm	480 mm	360N	BMW 3 1990 – 1999
51248171480		8 / 18 mm	95 mm	310 mm	640N	BMW 7 1994 – 2001

If you need OEM replacement parts for other vehicle models or require any other standard application gas springs, please visit the GASTAC online store to place your order and complete your purchase.
 

Interior Technology

• Highest corrosion resistance achieved through powder coated cyclinders and special treated piston rod surfaces.
• Minimal friction for the production of lowest extension forces.
• Great life cycles.
• Protection against vibration and light side forces.
• Integrated grease chamber.
• Low break away forces.
• Installation and storage in any position.

Original OEM vs GASTAC Aftermarket Trunk Lid Lift Supports

How to Replace Trunk Lid Lift Supports?

• Secure the Trunk Lid: Have an assistant hold the trunk lid open. Do not do this alone; a heavy trunk lid will drop rapidly and can cause injury.
• Release the Clip: Insert a flat-head screwdriver under the metal retaining clip on the old strut’s ball joint. Pry it up slightly and pull the strut off the ball stud.
• Clean the Studs: Wipe away old grease and dirt from the mounting studs. Install the New Strut: Do not pry the new clips open.
• Simply push the new strut socket onto the ball stud until you hear a distinct “Click”.
• Repeat: Follow the same steps for the other side, then test the trunk operation.

Why Vehicle Owners Choose GASTAC Trunk Lid Lift Supports?

• OEM-Equivalent Direct-Fit Replacement: Engineered to precisely match original factory specifications for seamless installation and perfect alignment without vehicle modifications.
• Stable Nitrogen Gas Pressure Technology: Utilizes consistent, high-pressure nitrogen gas to deliver dependable, smooth lifting force over long-term operation.
• Smooth and Controlled Trunk Movement: Features integrated dampening mechanisms to ensure steady opening and controlled velocity, preventing sudden bouncing or hinge damage.
• Durable Multi-Lip Sealing System: Equipped with advanced multi-lip seals that drastically minimize gas and oil leakage, extending the overall lifespan of the support.
• Reliable Performance in Extreme Temperatures: Calibrated to maintain stable pressure and optimal operation in both severe winter cold and extreme summer heat.
• Long-Lasting Heavy-Duty Construction: Built with high-strength steel cylinders and treated piston rods to withstand high-cycle fatigue and heavy daily usage.
• Wide Vehicle Compatibility Coverage: Available in a comprehensive range of sizes, lengths, and force ratings to fit various car makes, models, and body styles.
• Factory-Direct Pricing Advantage: Eliminates middleman markup to deliver premium, original-equipment quality hardware at highly competitive aftermarket rates.