The first thing to break on a tailgate assist is the gas strut, typically after 3 to 5 years of use. Leaks, rust, and loss of pressure are the most common failures, causing the tailgate to drop quickly or not stay up. Here is what you need to know about these failures and how to address them.
Gas Strut Failure: The Most Common Issue
Gas struts are the heart of any tailgate assist system. They contain pressurized nitrogen and oil to slow the tailgate’s descent. Over time, the seals dry out and crack, leading to slow leaks. You may first notice the tailgate dropping faster than usual or not staying open on an incline. On average, struts last 3 to 5 years, but extreme temperatures (below 0°F or above 100°F) can shorten this to 2 years. Replacing a strut costs between $20 and $50 for most truck brands. Look for corrosion near the rod seal as an early warning sign.
Mounting Brackets and Hardware: Rust and Fatigue
The brackets that hold the strut to the truck bed and tailgate are prone to rust, especially in salt-belt states. Steel brackets can corrode within 2 to 4 winters, causing the strut to detach. Aluminum brackets are more resistant but can crack if overtightened. The ball studs and clips also wear out, often breaking when you slam the tailgate. A broken bracket means the tailgate will free-fall, potentially damaging the cables or hinges. Inspect brackets annually and apply anti-seize to bolts. Replacement brackets run $10 to $30 per side.
Hydraulic Dampers and Internal Leaks
Some tailgate assists use hydraulic dampers instead of gas struts. These can develop internal leaks, leading to a spongy or jerky motion. The damper rod may also bend if the tailgate is overloaded (e.g., standing on it). A bent rod typically requires full damper replacement, costing $40 to $80. Unlike gas struts, hydraulic units cannot be recharged. If you see oil residue on the damper body, it is time to replace it. Avoid using aftermarket dampers that are not rated for your truck’s tailgate weight.
Frequently Asked Questions
How long do tailgate assists typically last?
Most tailgate assists last 3 to 5 years before needing replacement. Gas struts lose pressure gradually, while hydraulic dampers may fail suddenly. Regular inspection helps catch issues early.
Can I repair a leaking tailgate strut?
No, leaking gas struts cannot be repaired. The seals are internal and not serviceable. Replace the strut with a new one. Some brands offer lifetime warranties, so check your original purchase.
Do all truck models use the same tailgate assist parts?
No, tailgate assists are model-specific. Ford F-150, Ram 1500, and Chevy Silverado use different strut lengths and mounting brackets. Always verify compatibility before buying replacements. Check our guide on truck accessories for more details.
The Bottom Line
The gas strut is the first component to fail on tailgate assists, usually due to seal leaks or rust. Replace it promptly to avoid damage to your tailgate cables and hinges. Inspect brackets and hardware every year, especially if you live in a snowy climate. For reliable replacements, consider brands with good reviews and warranties. If you are looking for other tools to maintain your truck, check out our recommendations for OBD2 scanners to keep your vehicle in top shape.
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