How a tailgate information shock works

A tailgate information shock is a hydraulic cylinder that holds your truck's tailgate open and eases it closed. When you pull the tailgate down, the shock absorbs the weight so it doesn't slam or require you to hold it the whole way. When you push it shut, the shock slows the closing motion instead of letting gravity slam it hard against the frame.

The shock contains pressurized gas and hydraulic fluid separated by a piston. As the tailgate moves, fluid flows through a valve, creating resistance. Over time — usually between three and seven years depending on how often you use the tailgate — the seal inside wears out. Once it fails, the shock can no longer hold pressure, and the tailgate either won't stay open or closes too fast.

Not all trucks have tailgate information shocks. Newer full-size trucks from Ford, Chevrolet, and Ram often include them as standard or optional equipment. Older trucks and smaller models typically do not. Check your owner's manual or look underneath the tailgate on both sides — if you see a cylinder about the size of a spark plug, you have them.

Key Takeaways

  • A tailgate information shock is a hydraulic cylinder that holds the tailgate open and slows its closing, reducing strain on your hands and the tailgate hinges.
  • When a shock fails, the tailgate either won't stay propped open or slams shut on its own, and replacement requires removing the tailgate from the frame.
  • Replacement shocks cost between $40 and $150 per shock depending on the truck model, and most trucks have two shocks (one on each side).
  • You can replace a tailgate information shock yourself with basic hand tools if you are comfortable working underneath a vehicle, or have a shop do it in under an hour.

Signs your tailgate information shock is failing

The most obvious sign is that the tailgate no longer stays open on its own. If you pull it down and it slowly creeps closed, or if it won't hold at any angle, the shock has lost pressure. You may also notice the tailgate closes faster than it used to, or it slams shut with force even when you are trying to lower it gently.

A leaking shock is another indicator. Look underneath the tailgate on both sides where the cylinders attach. If you see oily residue or wet spots on the shock body, the seal has failed and the hydraulic fluid is escaping. A leaking shock will not hold pressure and must be replaced.

Do not ignore a failing shock. A tailgate that slams shut can pinch fingers, damage the tailgate itself, or strike objects or people behind the truck. A tailgate that won't stay open makes loading and unloading difficult and unsafe.

How to replace a tailgate information shock yourself

Replacing a tailgate information shock takes about 30 to 45 minutes per shock and requires only basic hand tools: a socket set, a wrench, and possibly a small pry bar. You will need to work underneath the tailgate, so use jack stands or a find work surface — never rely on a jack alone.

Start by opening the tailgate fully and locating the shock on one side. The shock connects to the tailgate frame at the top and to the truck frame at the bottom, usually with a single bolt on each end. Use your socket set to remove both bolts. The shock may be under pressure, so be prepared for it to move slightly as you remove the lower bolt.

Once both bolts are out, the old shock will come free. Take it with you to the parts store to confirm the part number and length, or reference your truck's year, make, and model. Install the new shock by reversing the process: insert the top bolt first, then the bottom bolt, and tighten both firmly. Repeat on the other side if both shocks need replacement.

Test the tailgate by opening and closing it several times. It should hold open at any angle and close smoothly without slamming. If it still won't hold, the shock may not be seated correctly — remove it and reinstall it, making sure both bolts are tight.

When to have a shop replace the shock

If you are not comfortable working underneath a vehicle or do not have the tools, a repair shop can replace a tailgate information shock in under an hour. Labor typically costs between $50 and $150 per shock depending on the shop's rate and your truck's design. Parts cost between $40 and $150 per shock, so a complete replacement of both shocks usually runs $180 to $600 total.

Some dealerships charge more than independent shops for the same work. Call ahead and ask for a quote on tailgate shock replacement — most shops can give you a price over the phone if you provide your truck's year, make, and model.

Choosing the right replacement shock

Tailgate information shocks are model-specific. A shock for a 2019 Ford F-150 will not fit a 2015 Ram 1500. Always order by your truck's exact year, make, model, and cab style (crew cab, super cab, regular cab). Your parts store or dealer can look this up from your vehicle identification number (VIN).

Aftermarket shocks are usually cheaper than OEM (original equipment manufacturer) parts and work just as well. Both types are available from auto parts stores, online retailers, and dealerships. Read reviews if you are buying online — some aftermarket shocks fail faster than others, and customer feedback will tell you which brands hold up.

Buy shocks in pairs. Even if only one shock is leaking, the other is likely wearing out at the same rate. Replacing both at once ensures balanced tailgate operation and saves you the cost of a second replacement in a few months.

Preventing premature shock failure

Tailgate information shocks wear faster if you use the tailgate heavily or in extreme temperatures. In very cold weather, the hydraulic fluid thickens and the shock works harder. In very hot weather, pressure inside the shock increases. Neither condition is avoidable, but awareness helps you spot early signs of wear.

Avoid slamming the tailgate shut or dropping it open suddenly. Smooth, controlled motion puts less stress on the shock seals. If you carry heavy loads in the truck bed, the extra weight on the tailgate frame can accelerate wear — this is normal and not preventable, but it explains why shocks on work trucks fail sooner than on personal vehicles.

Keep the tailgate hinges and shock attachment points clean and free of dirt and salt. Corrosion can damage the bolt connections and make the shock work harder. A quick rinse with fresh water after driving in salt or mud will extend the life of both the shock and the tailgate frame.

Frequently Asked Questions

Can I drive the truck if one tailgate shock is broken?

Yes, but the tailgate will not function normally and may be unsafe. A broken shock on one side can cause the tailgate to hang unevenly or close unpredictably. Replace both shocks as soon as you can to restore safe operation.

What happens if I ignore a failing tailgate shock?

The tailgate will eventually close on its own or slam shut without warning. This creates a safety hazard and can damage the tailgate, hinges, or anything behind the truck. The longer you wait, the more likely the tailgate frame itself will be damaged, which is much more expensive to repair.

Are tailgate information shocks covered under warranty?

Most factory shocks are covered under the truck's powertrain warranty, which typically lasts three years or 36,000 miles. If your truck is still under warranty and the shock has failed, contact your dealer about coverage. Aftermarket shocks usually come with a one-year or two-year warranty from the parts manufacturer.

Do I need to remove the tailgate to replace the shock?

No. You can replace the shock with the tailgate attached to the truck. Open the tailgate fully, remove both bolts on the shock, and slide the old shock out. Install the new one the same way. Removing the tailgate is not necessary and makes the job harder.

Why do some trucks have tailgate shocks and others don't?

Tailgate information shocks are an optional or standard feature on newer full-size trucks. Older trucks and smaller models were not designed with them. If your truck did not come with shocks from the factory, aftermarket kits are available, but installation is more complex and requires welding or drilling into the tailgate frame.