We have all been there. You are reaching into the trunk for gear or checking the oil, and the lid starts creeping down on your neck.
It is frustrating and, quite frankly, dangerous. You do not need a mechanic’s degree or a shop full of expensive tools to fix this common annoyance.
In this guide, we will show you exactly how to install gas struts so your hood or hatch stays exactly where you put it. We will cover the tools you need, safety precautions, and the pro-level tricks that make the job a breeze.
Understanding Gas Struts Before You Start
Before you grab your tools, you need to understand what you are working with. Gas struts, often called lift supports or gas springs, are nitrogen-filled cylinders that do the heavy lifting for your vehicle’s panels.
These components are under immense pressure. This pressure is what allows a small rod to hold up a heavy steel hood or a glass rear window.
When they fail, the internal seals have usually worn out. This allows the nitrogen gas to leak, leaving you with a “dead” strut that cannot support weight.
Matching the Specs
Not all struts are created equal. You must ensure your replacements match the extended length and the force rating of the originals.
The force is usually measured in Newtons (N) or pounds (lbs). Look for a printed code on the side of the old strut body to find these numbers.
If you are an off-roader with a modified tailgate, you might actually need a higher-rated strut than the factory original. We will dive into that later.
Essential Tools and Safety Gear for the Job
One of the best things about this project is the minimal tool requirement. You likely already have everything you need in your basic trail kit or garage drawer.
You will primarily need a small flathead screwdriver. This is used to pry up the metal retaining clips that hold the strut onto the ball studs.
In some cases, you might need a pair of needle-nose pliers or a small socket set if your vehicle uses bolt-on brackets instead of ball studs.
The Most Important Tool: The Prop Stick
Never underestimate the weight of a car hood or a rear hatch. Once you remove one strut, the remaining one will rarely hold the weight on its own.
Use a sturdy piece of wood, a broom handle, or a dedicated hood prop tool. This prevents the panel from crashing down on your hands or head while you work.
If you have a buddy nearby, having them hold the gate is even better. Just make sure they understand that the gate will get significantly heavier the moment you pop the old strut off.
Safety First
Always wear safety glasses. The metal retaining clips are spring-loaded and have a tendency to fly off in random directions when pried.
Keep your fingers away from the “pinch zone” where the hinges meet the body. A falling tailgate can cause serious injury in a split second.
The Step-by-Step Guide on How to Install Gas Struts
Now that you are prepared, let’s get into the actual process. Learning how to install gas struts is a foundational DIY skill that saves you high labor costs at the dealership.
Step 1: Secure the Panel
Open the hood, trunk, or hatch to its maximum height. Place your prop stick securely on a solid metal surface, ensuring it cannot slip.
Double-check the stability of the prop. Give the panel a small nudge to ensure it is completely supported before you reach near the struts.
Step 2: Locate the Retaining Clips
Most modern gas struts use a ball-and-socket joint. There is a small, flat metal spring clip wrapped around the head of the strut.
Look closely at the ends of the strut. You will see a small gap where a flathead screwdriver can fit under the metal band.
Step 3: Release the Old Strut
Insert your screwdriver into the gap and pry the clip outward. You do not usually need to remove the clip entirely; just lift it enough to clear the ball.
While holding the clip open, pull the strut head away from the vehicle. Start with the top mount first, then repeat the process for the bottom mount.
If the strut is stuck, a gentle wiggle usually frees it. Be careful not to scratch the paint on your vehicle’s body with the screwdriver.
Step 4: Prepare the Ball Studs
Take a clean rag and wipe away any old grease or dirt from the ball studs on the vehicle. This ensures a smooth pivot point for the new hardware.
You can apply a tiny dab of lithium grease to the ball, but most new struts come pre-lubricated. Check the inside of the new strut’s socket to see if grease is present.
Step 5: Snap on the New Strut
Position the new strut with the rod facing downward (in most applications). This keeps the internal seals lubricated by the oil inside the cylinder.
Simply align the socket with the ball stud and press firmly. You should hear a satisfying “click” as the internal spring clip locks into place.
You do not need to pry the clips on the new struts. They are designed to snap over the ball automatically when pushed.
Troubleshooting Common Installation Issues
Sometimes, things do not go perfectly. If the new strut seems too long, do not panic. It is rarely the wrong part; it is usually just an alignment issue.
Gas struts are very difficult to compress by hand. If the strut is slightly longer than the gap, have your helper lift the hatch slightly higher to meet the strut.
If the socket is facing the wrong direction, you can usually rotate the head. Grip the cylinder and the head, then twist it gently until it aligns with the ball stud.
Dealing with Rusted Studs
On older off-road rigs, the ball studs can become rusted or pitted. If the ball is no longer smooth, the new strut socket may wear out prematurely.
Use a bit of fine-grit sandpaper or a wire brush to clean the stud. If the stud is severely corroded, it is best to replace the stud itself, which usually unbolts with a wrench.
Upgrading Gas Struts for Off-Road and Heavy-Duty Use
For the FatBoysOffroad crowd, factory-spec struts are often not enough. If you have added a ladder, a spare tire carrier, or sound deadening to your hatch, the weight has changed.
In these cases, you should look for heavy-duty replacements. Many aftermarket companies offer struts with increased “force” ratings (measured in Newtons).
When calculating how to install gas struts for a modified vehicle, aim for about 10-15% more force than the stock units. This compensates for the extra weight without making the door impossible to close.
Cold Weather Performance
If you do a lot of winter wheeling or camping, you might notice your struts failing only when it is freezing. Gas pressure drops in the cold.
Upgrading to a high-quality brand like Stabilus or Monroe can help. These brands often use better seals that remain pliable in sub-zero temperatures.
Maintenance Tips to Extend the Life of Your New Struts
Once you have successfully completed the installation, you want those struts to last. The biggest enemy of a gas strut is shaft contamination.
If you spend time on dusty trails, the chrome rod can get coated in grit. When the strut closes, that grit is pulled through the rubber seal, causing leaks.
Periodically wipe the chrome rods with a clean, soft cloth. Do not use heavy greases or silicone sprays on the rod, as these actually attract more dust.
Check for Binding
Every few months, check the mounting points. Ensure the ball studs are tight and the strut moves freely without clicking or popping.
If you notice the strut body is dented or the rod is bent, replace it immediately. A damaged strut can fail catastrophically and cause the panel to drop without warning.
Frequently Asked Questions About Gas Struts
Should I replace gas struts in pairs?
Yes, it is highly recommended. If one strut has failed, the other is likely near the end of its life. Replacing only one puts uneven stress on the new unit and the hinges.
Which way does the gas strut go?
In most cases, the body (thick part) should be at the top, and the rod (thin part) should point down. This ensures the internal oil bathes the seal, preventing it from drying out.
How do I know what size gas strut I need?
Measure the strut from the center of one ball socket to the center of the other while it is fully extended. Also, check the side of the strut for the force rating in Newtons (N).
Can I repressurize an old gas strut?
No. Gas struts are sealed units. Once the gas has leaked out, the internal seals are usually damaged. Attempting to “refill” them is dangerous and ineffective.
Conclusion
Knowing how to install gas struts is a simple yet rewarding DIY task that improves the safety and convenience of your vehicle. Whether you are prepping for a cross-country overland trip or just want to stop your trunk from hitting you, this fix is worth the effort.
Remember to always prioritize safety by using a prop stick and wearing eye protection. Take your time to clean the mounting points and ensure the new units are properly seated.
By following these steps, you will ensure your hood and hatch operate smoothly for years to come. Now, get out there, fix that sagging gate, and stay safe and stay comfortable on your next adventure!
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