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Gate King Adjustable Truck Bed Extender

Gate King Adjustable Truck Bed Extender

Item # GK37FR
Our Price: $228.28
You Save: $23.97

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Shipping Weight: 4 lbs
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Carry longer loads or create a wheel chock for your dirt bike with these tailgate adjusters. Durable, stainless steel bars replace factory cables and allow you to adjust your tailgate to 8 different angles. Easy installation - no drilling required. Great Prices for the best tailgate from Gate King. Gate King Adjustable Truck Bed Extender part number GK37FR can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (19)
  • Q & A (0)
  • Videos (2)
  • Photos

Gate King Tailgate - GK37FR

  • Tailgate Assist
  • Truck Tailgate
  • Gate King

Carry longer loads or create a wheel chock for your dirt bike with these tailgate adjusters. Durable, stainless steel bars replace factory cables and allow you to adjust your tailgate to 8 different angles. Easy installation - no drilling required.


  • Tailgate adjuster bars let you safely carry longer loads in your truck bed
    • More convenient and less cumbersome than typical tailgate extenders
    • Great for trucks with tonneau covers and camper shells
  • Sturdy bars let you adjust your tailgate to 8 different angles from open to closed
    • Allow the tailgate to support your load while locked in position
    • Turn your tailgate into a wheel chock for dirt bikes and ATVs
  • Simple operation - just lower your tailgate, engage the pins on each side, and lift to desired angle
    • After your tailgate is closed, the pins return to the open position for normal tailgate use
  • Quick and easy installation with included mounting hardware - no drilling required
    • Replaces factory tailgate cables and uses existing bolt holes
  • Durable, stainless steel construction with e-coat finish resists corrosion
  • Made in the USA


  • Quantity: 2 support bars
  • 3-Year limited warranty

Note: Gate King adjustable tailgate support bars do not replace the need for ratchet straps or tie-downs. Support bars will not work with most after-market slow-release bars and may not work if your truck's tailgate is bent, dented, or misaligned.

gate king ladder

If you've struggled with hauling a dirt bike or ATV in your truck bed or with transporting building supplies from the hardware store, the Gate King adjustable truck bed extender is the perfect solution. These durable, stainless steel bars let you adjust your tailgate to different angles so you can accommodate longer loads in your truck bed.

Make Your Tailgate Adjustable

gate king ladder

Unlike cumbersome, traditional truck bed extenders that either install in your hitch or have to be mounted around your tailgate, the Gate King adjustable bed extender replaces your factory tailgate cables. Since it is always ready to go, you won't have to waste time with installing a traditional extender. And the Gate King adjusts your tailgate to 8 different angles from open to closed, giving you several options for different types of long loads from lumber to stand-up paddle boards.

gate king tonneau cover

If you have a tonneau cover or camper shell installed on your truck, this innovative system will let you carry longer loads without having to open the cover or drive with the camper shell door open.

gate king wheel chock

Additionally, you can use the adjustable tail gate extender to turn your tailgate into a wheel chock for dirt bikes and ATVs.

Simple and Quick Operation

gate king pins engaged

The Gate King adjustable truck bed extender is incredibly simple to operate. Simply lower your tailgate, engage the pins on each bar, and lift to your desired angle. As you lift, you'll hear an audible click when your tailgate locks in at each increment.

gate king tailgate closing

Once you lift your tailgate completely to close it, the pins will return to the open position. This will let you use your tailgate normally. However, if the tailgate is locked at the tightest angle and unable to close due to a tonneau cover or camper shell, the included tool lets you to release the pins and open the tailgate. This tool also is helpful for other situations where you can't easily release the pins by hand.

490318 Gate King Tailgate Adjuster

This Product Fits The Following Vehicles

Video of Gate King Adjustable Truck Bed Extender

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Gate King Adjustable Tailgate Support Bars Review

Hey guys, John here for And today we are going to be taking a look at the Gate King Tailgate Adjuster to demonstrate how the Gate King works. Let's first see what our tailgate acts like without the Gate King installed. So this operation will be normal with the gate team. When we push our tailgate back up and in place, that's where the Gate King will stop it so we can basically put pressure or anything in the back of our pickup or to hold things up in place. With just our cables here our tailgate's going to fall down at any angle that we have at, until we put it up, back in place.

So with the Gate King installed now so let's see how it performs compared to how our initial tailgate was working. So we can still operate it like normal down and pushing it back in place.But when we want to use the Gate King, pop the pins here, and now we can adjust it at different stopping points all the way, depending on what kind of cargo we have in our truck bed. This is a keeper pin and so when we push this down and in place that unlocks, this allows us to use our tailgate as normal otherwise, we can reset the entire function by lifting our tailgate completely into place and this here presses the pin all the way into that clip so then we can use our tailgate as normal. It allows us to adjust their tailgate to different levels so, that way we can accommodate a wider variety of cargo. Here, we have our paddle board in the back of our pickup, and instead of the paddle board sitting straight out, we now have it elevated so it sits up out of the way.

And it's a little more visible for other people who are on the road.Here we have a 10 foot ladder in the bed of our pickup. And while we're able to kind of wedge the bottom of a ladder under our toolbox and then press this up so it doesn't move a whole lot up and down yet there is still free movement here so it's always a good idea to use some tie-down straps to secure whatever kind of cargo we still have in the bed of our truck. So the Gate King replaces the cables that we normally use for our tailgate. And while it doesn't increase the weight capacity of our tailgate, we're still able to use the tailgate as normal. So any load you normally put on it, like sitting on it, or maybe a cooler or something like that, and you still do that safely.Our kit comes with two Gate Kings, one for either side of the tailgate, two stabilizers, four bolts, four washers, four spacers, our release key as well as a hose clamp to keep our tailgate in place for when we have it set at a 45 degree angle.

For install, first thing we need to do is lay everything out so we can make sure we have everything in place. Our instructions has some easy steps on one side, as well as the list of parts and some tips for installing for like this compared to a whole notebook that we have to open and keep flipping pages, it's all right here. We also need some Torx bits and Allen bits, a pair ratchet as well as a Flathead screwdriver for installing the hose clamp. So it's very minimal amount of tools that we need. First thing we need to do is remove our tailgate cables for that.

We use the Torx bit one bolt up here, we'll have another one on the side of the tailgate. With the top removed, we'll go ahead and remove this bolt that's on the tailgate itself.We're ready to install the Gate King. When we go to position this, make sure that the pin is up on this arm, that's facing our cab. And then the silver plate here is facing towards the inside of our bed. And then the long, the long arm with this clip that sticks straight out that one is next to our tailgate like this. I'm going to install the top bolt first. So it's going to be the larger of the two. We'll put our, nope. I'm going to install the top bolt first so it's the larger of the two bolts and we will put our slides plate in place, the bolt through. And then we're on the other side, we're going to add the spacer for the larger bolt and then our two washers. And then before we start installing this, we're also going to add some thread locker and that is going to help keep our bolt in place for when we're driving down the road and we have the vibration from the road. Thread it by hand. Then We'll grab our ratchet here, tighten it down.Here at the lower end we'll put our spacer in place. Put the bolt through. We'll add just a little bit of thread locker before installing this bolt. You might have to lift your tailgate up just a little bit to get this started. So you don't have any pressure on that bolt. Again, though we'll thread it in as much as we can by hand and grab our ratchet, finish it up. Everything tightened down, we'll go ahead and repeat the same process for the other side of our tailgate.So the last thing we need to do is install this basic hose clamp this goes over this socket portion where our tailgates is attached to our truck. So we actually lift our tailgate to about a 45 degree angle. We can lift it off of these hinges. So this prevents that from happening because with our Gate King system, we can stop the tailgate at different angles. If we stop it at the 45 degree angle, then we're in danger of the tailgate popping off of that socket there. So this helps prevent that. Tighten that down to help keep our two gate in place. So, that's going to complete our look at the Gate King Tailgate Adjuster. Thanks for watching.

Customer Satisfaction Score:

Customer Reviews

Gate King Adjustable Truck Bed Extender - GK37FR

Average Customer Rating:  4.1 out of 5 stars   (19 Customer Reviews)

Carry longer loads or create a wheel chock for your dirt bike with these tailgate adjusters. Durable, stainless steel bars replace factory cables and allow you to adjust your tailgate to 8 different angles. Easy installation - no drilling required.

2016 Ram 2500

Will hold the tailgate up so I can pull my camper with my four wheeler in the back.



It is still working good.


This product works great. I'm able to adjust my tailgate to help me haul lumber or anything large in my short bed truck. Because it's easy to use, simple to install and heavy-duty, I would recommend this product to anyone needing more versatility out of their truck bed.


It's expensive for hinges, but they work great. Have utilized them a lot. It really helps when you have a tonneau cover but still want something to hang out like pvc pipe but do not want to open the cover.


For the price I expected less slop in the action as it opens, slaps against the tailgate. However, once extended or locked it is good. Remember to also use the spacer from your original cables (2019 Silverado) you will need them on the top bolts. The retaining clips (spring steel) were not tight enough so every third or forth closing/opening the ratchet would engage on one of the support bars. Simply squeezed them both with pliers to create a firmer fit. See one of the photos submitted showing the clip.


Poor fit and finish. Product does not fit properly. Tried to return initially but too expensive for postage to return.


After one year the locking mechanisms don't automatically lock. I have to manually push the bar to lock it . I've tried a couple of different lubricant. None worked. The spring doesn't seam strong enough. Also the tab that pushes the locking arm into the open position when closing the tailgate came off .


Works well. I needed these because having a contractor cap with side boxes, there was no room to carry sheets of plywood between the toolboxes and top of tailgate.


Easy install on my 2018 Chevy Crewcab. Had to use 1 extra washer per screw to make it just right.
Thank you for a good product.


Received my order two days early! I immediately installed the Gate King and tested. Only took 10 minutes. Seems nice with a lit of adjustment. I will be hauling our golf cart while towing our travel trailer and this us tge perfect product to secure the tailgate.


I do not recommend this product for a Toyota Tundra 2014 to 2021. I have a 2016 Tundra and did not work. Bad customer service when trying to return the part. They didn’t answer my calls or emails. They had me send pictures multiple times of how the part fitted my tailgate. Took 2 weeks to get a response for a RA number.


Got it today and already installed. Will make a difference when carrying my UTV in the truck bed.


This is made to a very high standard. It performed like it was standard equipment on our truck. As soon as we installed it, we went to the hardware store and purchased lumber for a project. Worked excellent. It held the lumber up against the tanno cover. Didn't even need to tie the load down. Excellent product. Next I'll load my motorcycle in my truck and see how good it holds up. Can't wait


This is a very good product, however it’s way too expensive for the pair I can’t recommend it because of the cost. In my opinion it’s at least double the cost of what it should be.


by: 01/22/2023







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Info for this part was:

Employee Chris R
Video Edited:
Chris R
Employee Daron K
Edited by:
Daron K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Jon G
Test Fit:
Jon G
Employee Kristina F
Updated by:
Kristina F
Employee Alex H
Written by:
Alex H

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