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Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins - Qty 1

Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins - Qty 1

Item # LC177223
Our Price: $70.22
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Shipping Weight: 5 lbs
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Replace the built-in shock on your Trailair Air Ride or Flex Air fifth-wheel pin box. Helps keep the air bag from breaking down. 1-800-940-8924 to order Lippert accessories and parts part number LC177223 or order online at Free expert support on all Lippert products. Great prices and Fastest Shipping for Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins - Qty 1. Accessories and Parts reviews from real customers.
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  • Reviews (68)
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  • Videos (2)
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Lippert Accessories and Parts - LC177223

  • Fifth Wheel King Pin
  • Shocks
  • Trailair Pin Box
  • Flex Air Pin Box
  • Lippert

Replace the built-in shock on your Trailair Air Ride or Flex Air fifth-wheel pin box. Helps keep the air bag from breaking down.


  • Replace the built-in shock on your Trailair Air Ride or Flex Air fifth-wheel pin box
    • Fits Trailair Air Ride models LC155933, LC158778, LC155943, LC155930, LC171200, LC179879, UF35-946208, UF35-946209, UF35-946210, UF35-946211, UF35-946212, UF35-946213, UF35-946214, UF35-946215, UF35-946216, UF35-946219, UF35-946220, UF35-946222, UF35-946223, UF35-946224, UF35-946228, UF35-946229, UF35-946231, and UF35-946232
    • Fits Trailair Flex Air models LC328492, LC328484, and LC369535
  • Helps keep the air bag from breaking down


  • Compressed length: 8-3/8"
  • Extended length: 11-5/8"

177223 Replacement Shock for Trail Air 5th Wheel King Pins - Qty 1

Video of Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins - Qty 1

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

Video Transcript for Lippert Trailair Air Ride and Flex Air 5th Wheel King Pin Shock Review

Hey everybody, how's it going Today we're gonna be going over and showing you how to install the replacement shock absorber here for a Lippert Trailair and CURT Flex Air fifth-wheel pin boxes. So in regards to compatibility, this shock here actually works here with a couple of different pin box models. Whether you have the Ultra-Fab, Flex Air, you have any of the Trailair, Air Ride pin boxes or you have the CURT Flex Air, this shock here is gonna be an exact fit replacement. Now, this is an exact OEM-direct fit replacement part. This isn't made by another manufacturer. This is made directly by the manufacturer, the pin box.

So, it's gonna be an exact bolt-on fit and it's gonna be the same quality as the pin box that we have here. So Lippert actually changed the design of this shock absorber here on their older models that we're branded under Trailair. They used a sticker that had the fill line in there, but the problem was that, is that sticker over time would wear off and it'd eventually work itself loose from the shock absorber. Therefore, we'd lose that mark that we need to inflate our air bag too. Well, they've actually redesigned the shock absorber to now it's actually etched into the inner tube here.

You can see the "Inflate to this line." There's an arrow, and then we have our line up here. So it's actually etched into the shock absorber now so you don't have to worry about that sticker falling off. So the missing sticker is one reason you would wanna replace your shock absorber. Another one is if the shock absorber is worn out, because these do fail over time, depending on how hard we're using them or how long they've been installed. Now, we're kind of playing this by feel in regards to how to tell if the shock absorber is bad.

Basically, if you experience excess bouncing here with your pin box here, that means the shock absorber is not returning to the normal position, and therefore that would indicate it's faulty. And if we also take it off and just sort of play with it by hand, it should be pretty easy to compress and retract by hand, that would indicate its faulty. This one takes a lot of force. Almost as much as I'm able to give it in order to compress and retract it. So that would indicate that this is working correctly, but if it moved really easily by hand, that would indicate it's faulty and would need to be replaced.

So a lot of it's just playing with it by feel, sort of feeling how the trailer rides as it was new and replacing it based on those criteria. So the first step of our installation, we do need to make sure we release all the air pressure from our airbag. And then we're gonna come up top here with a 3/4 inch socket and wrench and begin by removing this top bolt here. So, now we're gonna slide the bolt out. Now there's a little bit of tension on that bolt now. So what I'm gonna do is I'm just gonna sort of press up on the bottom of the pin box a little bit, should give us enough leverage to pull the bolt out like so, and then our shock absorber should just tilt down. Now we use that same combination of our 3/4 inch socket and wrench and we'll remove that bolt on the bottom as well. Go ahead and slide our bolt out, and our shock should come out next. Next, we're gonna take our shock assembly here. We wanna make sure that this decal here with our inflation line is facing out away from the pin box. We also want to ensure that the outer sleeve is gonna be attached at the top here. The inner sleeve is gonna go towards the bottom. So we'll go ahead and set it into position now. We'll take our factory hardware here, our factory bolts that we removed. I'll go ahead and thread that on, just loosely thread that, and then I'm going to line up the one on the top. So in order to do that, we're again gonna have to lift up from the bottom of the pin box. It doesn't take a lot of force. Get our bolt started there. Once we have that through, we'll install our nyloc nut. And then we'll come back with our 3/4 inch wrench and socket and tighten those down. Now there isn't actually a torque spec provided with these. The manufacturer does not specify, so we're just gonna be doing it by feel. With the nyloc nut, as soon as you get the nylon through the threaded nut there, that's gonna serve its purpose there. You don't have to worry about it backing out. You don't wanna get it too tight, but again we're just gonna be doing most of this by feel. You can sort of gauge how much pressure it took to release that nut. That's about how much we're gonna tighten it. Unfortunately, we just don't have exact torque specifications, so we do need to do this by feel, and use our best judgment. So now, once we have both of those bolts tightened down, that's gonna do it today, for our look at the replacement air shock, for our Lippert Trailair and CURT Flex Air fifth-wheel pin boxes..

Customer Satisfaction Score:

Customer Reviews

Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins - Qty 1 - LC177223

Average Customer Rating:  4.7 out of 5 stars   (68 Customer Reviews)

Replace the built-in shock on your Trailair Air Ride or Flex Air fifth-wheel pin box. Helps keep the air bag from breaking down.


Fits my pin box and cushions the ride of both the camper and my truck. The markings on the outside indicating how much air is to be put in the bladder were wrong but etrailer gave me a pressure range to go by and it works well.


Did not receive the shock, receive the other two parts. Only valve stem, and air spring was in the box


I love the parts. I also purchased the air bag for the hitch. It all came to me as agreed.


Great product and with no sticker to take care of is even better!


Decal a little buggered up so I made my own out of reflective tape.


The shock was a Lippert componentfrom what I could tell, at a good price and etrailer's better than average delivery. Added it to our DRV Mobile Suites 36' system to help soften the Pinbox recoil of the airspring going over rough bridge transitions.


Perfect replacement shock absorber for the Flexair hitch on our Redwood fifth wheel. We had a mishap that left the original with a bent case and it was difficult to set the pressure in the air bags as it would often stick. Simple to install and has my has my hitch back to proper operation. Ordering process was easy, part arrived on time in perfect condition.



The replacement shock is still performing as it should.


Parts fit as expected


I ordered replacement shocks for my trailair hitch. they arrived on the promised delivery date and were identical to the OEM shocks. The ride of the trailer improved, the old shocks were 10 years old.

Dale L.


I bought 2 new shocks for my trailair fifth wheel hitch a d they are working out very well.


The shock has a stamped metal line verse the old paper decal line. Fits perfectly


I chose Etrailer parts because they had a good selection of high quality replacement parts for my AirRide 5th wheel hitch (and everything else I need for my truck and trailers). My original equipment was very old, and I expected it to be impossible to find a replacement that fit, but George at Etrailer had them NEW. I installed the parts a year ago and I have been very happy. The quality is clear after a year of hard use--the parts still look and perform like new (better than the rest of the trailer!). The pictures show it ... the shock absorber and air bladder and steel yellow valve stem still in top shape with almost a thousand miles on them. So glad I have Etrailer a try!


Great customer service, friendly and able to answer any questions asked.


Easy to replace, and made a huge difference on the comfort of the ride in my truck. Noticed that I needed a new one when it took extra air pressure in the air bag to raise the shock to the proper height. Wish I had noticed that earlier. Well worth replacing, and the service from etrailer has always been top notch. Got a B&W fifth wheel hitch earlier, and that is completely amazing!! Worth every penny!


Great service, Replacement Part as original. Perfect fit
Shock use on Lippert Trail Air Pin Box

Gary L.




The visual appearance was not what I was expecting. The paint was very scuffed as shown in the pictures. It appears to have been in your inventory for a long time an potentially handled roughly.

Hopefully it will be functionally fine.

Etrailer Expert

Heather A.


I will have customer service reach out to you.


I have not had a chance to install my new shock absorber. After I have installed it and tested it, i will write a better review. I was very happy with the order process and the delivery.



The product works perfectly. Exact replica of what I replaced. Good price and speedy delivery. Happy camping.


Fit just fine


Shipment arrived as promised fitment was as expected


Just installed the shock. It should work as advertised.


Easily found the part I was looking for? Will look use etrailer again.


It was exactly like the old one being that I used the old part number


After receiving the replacement shock, I took it out of the package, got my socket set and installed in five minutes. Easy install. If I needed another, I would purchase this one.


Product arrived in just a few days. It was easy to install and only took 10 minutes. Great service from etrailer staff with help on finding the correct item for my Flex Air 328492 king ping.


I replaced the shock on my Flex Aire pin box that had been damaged due errant parking. It was a diprect replacement first all, two day shipment, simple, easy to install and I feel confident of the future performance. This a great set up too, smooth riding all the way.


Needs to have the full pressure marking like the original shock has. Would make it much easier to know when you are getting the proper amount of air in the bladder.

Show More Reviews

See what our Experts say about this Lippert Accessories and Parts

  • Is the Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins an Exact Replacement
    The Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins part # LC177223 is as it appears in our photos. Check out the linked photo from one of our customers that has installed two of them on his king pin.
    view full answer...
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  • Trail Air Pin Box Shock and Air Bag Replacements?
    What you're experiencing is exactly what a Trailair is supposed to suppress and would tell me that some of your components are worn down. While some chucking is inevitable, your shock shouldn't really move freely like you're suggesting, so replacing the shock would likely help fix some of your current problems. I can't say that I've seen a Trailair pin box that has a 24,000-lb capacity; I've only seen them go up to 21,000-lbs. If you do end up having a 21000-lb version opposed to a 24000-lb...
    view full answer...
  • Can Trailair Flex Air King Pin be Replaced or is New Pin Box Needed
    The bolt-on section that has the king pin on the Trailair Flex Air 5th Wheel Pin Box - Lippert 1621 # LC369535 is not a part that is replaceable, likely because it is so vital to the integrity of the entire pin box and its 21,000 lb capacity. So while it may not be the news you want to hear, in order to ensure you are able to tow safely you will need to replace the entire Trailair pin box entirely.
    view full answer...
  • How to Know It's Time to Replace Shock of Trailair Pin Box
    Shocks slow the rebound and movement of the two parts they are installed on. So if all of a sudden your Trailair pin box becomes much harsher when at the correct air pressure for your trailer that would indicate that the shock is bad and in need of replacing. Or if it looks psychically damaged as well.
    view full answer...
  • Replacement Shock Recommendation for Trailair Pin Box
    Sounds like you are looking for a replacement shock for the Trailair pin boxes. For that you would want the part # LC177223 which is exactly what you'd need.
    view full answer...
  • Air Pressure Range for a TrailAir Flex Air 5th Wheel Pin Box
    Air pressure for the TrailAir pin boxes such as # LC328492 can range from 20 to 120 psi. There isn't a specific amount of pressure you have to use. Instead it is recommended to inflate the air bag to maintain a level ride height but do not inflate the bag over 120 psi. You could also get a replacement shock, # LC177223.
    view full answer...
  • If Lower Plate of Trailair Pin Box Replaceable
    The lower plate of the Trailair pin box is not replaceable but if you were in a situation where it would need to be replaced you'd need to replace the entire pin box. There isn't an exact figure or dimension that gets checked to know if the lower plate is bad or damaged but you'd just have to look at it and look for signs of wear or damage to the king pin and plate.
    view full answer...
  • Replacement Air Bag and Shock for Trailair Pin Box
    For your Trailair pin box the correct air bag replacement is the part # LC432404 that you referenced. Then for the replacement shock you'd need the part # LC177223.
    view full answer...
  • Shock Replacement for a Trailair Cushioned Pin Box
    The correct replacement shock for a Trailair Air Ride pin box is the part # LC177223. The shocks do not have weight capacities.
    view full answer...
  • Correct Replacement Air Bag and Shock for Trailair 5th Wheel Pin Box
    The correct replacement air bag and shock for a Trailair 5th Wheel Pin Box is the Replacement Air Spring part # LC432404 and the Replacement Shock part # LC177223. Unfortunately, the average life span would vary greatly by the amount of use so I don't have any sort of timeline to provide. I have attached for you below install videos I did on each of these components if you have trouble getting them on.
    view full answer...
  • Replacement Shock and Air Bag for Trailair Tri-Glide Pin Box
    You can find the parts right here! I reached out to the manufacturer, Lippert, about the correct replacement shock and air bag for your Trailair Tri-Glide pin box. They told me you will be able to use the Replacement Shock # LC177223 as well as the Replacement Air Spring # LC432404 on your Tri-Glide.
    view full answer...
  • Where is Pin Box Model Info Listed on Fifth Wheel Trailer
    Pin box model info can be listed in a few different places. For example the Trailair pin boxes like the part # LC155943 that you referenced is listed on the side of the box. Other boxes might have the info on top of the box or underneath. In some cases the sticker may have fallen off. Which we have a help article that I linked that details how to measure a pin box to determine what model it is. If you needed a replacement Trailair shock we have the part # LC177223 which underneath the...
    view full answer...
    Image 1 for
  • Replacement Shock Absorber For Trailair Flexair Fifth Wheel Pin Box
    We do have the replacement shock you need for your Trailair Flex Air 5th Wheel Pin Box, part # LC328492. You can order part # LC177223. this chock is a replacement for Trailair Flex Air and Air-Ride pin boxes and will work great for you.
    view full answer...
  • Flex Air Replacement Shock Availability
    It's hard to see the dent in the picture you submitted so it's harder to say but it looks like it's probably fine. I'd probably take it on a short trip around the block keeping and eye on it and see if it works like it should. If you find you need a replacement you'd want the part # LC177223.
    view full answer...
    Image 1 for
  • Operating PSI for Lippert FlexAir Pin Box
    The Trailair Flex Air 5th Wheel Pin Box - Lippert 1621 - 18,000 lbs # LC328492 should be inflated to between 20 and 120 psi. There isn't a specific pressure the manufacturer suggests but rather that the sticker on the front shock absorber with the arrow pointing to a line as shown in the attached photo and replacement shock # LC177223 when the trailer is at rest while connected.
    view full answer...
    Image 1 for
  • Replacement Air Bag and Shock for Trailair Pin Boxes
    For Trailair pin boxes the replacement shock is the part # LC177223 and the replacement air bag is the part # LC432404.
    view full answer...
  • How the Shock Works on Trailair Air Ride and Flex Air 5th Wheel King Pins
    The Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins, part # LC177223, is a shock that also serves as a dampener for kickback. What that means is this shock works in conjunction with the king pin's air bag to absorb road shock from bumps. This keeps the air bag from bursting. Then, after everything is compressed, it dampens the kickback (upward rebound) from the air bag to its natural position. This position is not fully extended like a traditional air bag suspension....
    view full answer...
  • Is Uneven Shape of Trailair Pin Box Air Bag a Problem
    Thank you for the photo of your TrailAir pin box's rubber air spring. The shape/position of the bag are not necessarily an issue. Just in case I do suggest that you check that your air bag is inflated to the correct pressure. There is a simple way to determine the correct pressure. Hitch your trailer and them slowly add pressure through the air bag's Schrader valve. Add pressure until the two black arrowheads on the yellow sticker on the shock are just visible. Please refer to the linked...
    view full answer...
    Image 1 for Image 2 for
  • Replacement Air Spring and Shock for Flex Air 5th Wheel Pin Box LC328492
    If the rubber air spring in your Trailair Flex Air 5th Wheel Pin Box # LC328492 has failed you can replace just the spring itself with part # LC432404. We also offer a replacement shock for this pin box which is part # LC177223.
    view full answer...
  • Should Cracked Air Bag for Trailair Air Ride 5th Wheel Pin Box be Replaced
    There isn't really a life expectancy rating for the air bag # LC432404 in your Trailair Air Ride 5th Wheel Pin Box simply because there are too many factors that go in to determining this (how often the trailer is used/not used, how much air is in the bag, climate, how exposed it is to the sun, etc...). With that said, from the picture you sent in I'd definitely go ahead and switch that out because yours looks really worn and 5 years service really isn't too bad. One tip I do have though...
    view full answer...
    Image 1 for
  • Replacement Air Bag and Shock for a TrailAir Cushioned Pin Box
    Can't say I have seen a 24K Trailair pin box before. What is the model number on it? The highest I have seen is 21K and the air bag for those and some 18K models is # LC432404. There should also be some information on your existing air bag if you can take it out. For the shock use # LC177223.
    view full answer...
  • Can the Trailer Still Be Towed With the Trailair Air Ride 5th Wheel Pin Box If the Air Bag Fails
    If the airbag inside of the Trailair Air Ride 5th Wheel Pin Box part # LC158777 fails which is very rare then it would be best to have a backup on hand, the Replacement Air Spring for Trailair 5th Wheel Pin Boxes part # LC432404 that way you can replace this roadside because it is only held in place with three nuts/bolts so it should be rather easy. We also have the Replacement Shock for Trailair Air Ride and Flex Air 5th Wheel King Pins part # LC177223 but this is not as critical to have...
    view full answer...
  • Air Bag Inflation Instructions On Trailair Pin Boxes With 18,000 lb Capacity
    There are a couple different Trailair pin boxes for the 18,000 lb capacity. There is the Flex Air like # LC328492 and the Air Ride like # LC179879. With either model, the air bag should be inflated until the outer cylinder of the shock rises high enough to fully expose the yellow inflation indicator sticker that you can see in its entirety on part # LC177223. There is not a listed max psi.
    view full answer...
  • Troubleshooting Trailair Air Ride Pin Box Not Holding Air To Line on Shock Sticker
    The Trailair Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs # LC369535 will have an air bag pressure range between 20 and 120 psi. Lippert techs say that sticker is there to assist but is not always accurate due to the fact it is a sticker that can be slightly misplaced. If your air bag is within the 70-100 psi range then they said not to worry about the sticker. It is a reference point and not a perfect guide. I recommend using a pressure gauge to confirm the 70-100 psi as...
    view full answer...
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