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  1. Gooseneck and Fifth Wheel Adapters
  2. Gen-Y Hitch
  3. Fifth Wheel Trailer to Gooseneck Hitch
  4. Replaces King Pin
  5. 30000 lbs GTW
  6. King Pin Adapters
Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 4.5K TW

Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 4.5K TW

Item # GY58FR
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Our Price: $1,419.43
Gooseneck and Fifth Wheel Adapters
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Shipping Weight: 165 lbs
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This shock-absorbing pin box works with your gooseneck hitch to give a smooth ride while you tow your fifth-wheel trailer. The all-in-1 box has no air bags to refill or small parts to replace. Manual latch allows for simple hookup. 4.5K pin weight. 1-800-940-8924 to order Gen-Y Hitch gooseneck and fifth wheel adapters part number GY58FR or order online at Free expert support on all Gen-Y Hitch products. Guaranteed Lowest Price and Fastest Shipping for Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 4.5K TW. Gooseneck and Fifth Wheel Adapters reviews from real customers.
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Gen-Y Hitch Gooseneck and Fifth Wheel Adapters - GY58FR

  • Fifth Wheel Trailer to Gooseneck Hitch
  • Replaces King Pin
  • 30000 lbs GTW
  • Gen-Y Hitch
  • King Pin Adapters
  • Adapts Trailer

This shock-absorbing pin box works with your gooseneck hitch to give a smooth ride while you tow your fifth-wheel trailer. The all-in-1 box has no air bags to refill or small parts to replace. Manual latch allows for simple hookup. 4.5K pin weight.


  • 5th-Wheel-to-gooseneck adapter box lets you tow your 5th-wheel trailer with your gooseneck hitch
    • 5th-Wheel pin box replaces the factory pin box on your trailer
    • Coupler attaches to your truck's gooseneck hitch ball
  • Shock-absorbing design ensures a smooth, steady ride
    • Technology functions like a torsion axle to limit transfer of road shock from trailer to truck and vice versa
      • Reduces chucking and rough fore-and-aft motion
      • Limits bounce and jarring up-and-down motion
    • No airbags to maintain and fewer moving parts to repair or replace than with other shock-absorbing solutions
  • Coupler socket secures to hitch ball with pin-style latch
  • Pin weight scale is built in to help you balance your trailer
    • Meter lets you know if your load needs to be adjusted before you tow
  • Cross-shaped holes provide attachment points for safety chains
  • Heavy-duty steel construction
  • Powder coat finish resists wear and corrosion
  • Simple, bolt-on installation
    • Mounts with existing bolts
  • Made in the USA


  • Designed to replace Lippert 1621 and 1621 HD 5th-wheel pin boxes
  • Towing capacity: 30,000 lbs
  • Pin weight capacity range: 2,000 lbs - 4,500 lbs
  • Ball size: 2-5/16"
  • 5-Year limited warranty


  • In order for the pin box's shock absorption to work correctly, make sure your pin weight is within the pin weight range.
  • To calculate correct towing weight for Gen-Y hitches, use this formula: GVWR x 0.22 = TW.
  • Because the Gen-Y Hitch Executive is shorter than the Lippert 1621 or 1621 HD pin box, the clearance between your trailer and tow vehicle during turns might be reduced.

Calculated Tongue Weight Executive Tongue Weight Capacity Required
500-1,500 lbs 2,000 lbs
1,501-3,000 lbs 3,500 lbs
3,001-4,000 lbs 4,500 lbs
4,001-5,000 lbs 5,500 lbs
5,001-6,000 lbs 6,500 lbs
6,001-7,000 lbs 7,500 lbs
7,001-8,000 lbs 8,500 lbs

Fifth Wheel to Gooseneck Adapter

Say your truck has a gooseneck hitch for towing your horse trailer, but you want to go camping with your new fifth wheel. You could outfit your truck with a new fifth-wheel hitch that attaches to your existing gooseneck hitch, but that means having to move a heavy, bulky hitch into and out of your truck bed all the time.

You could also purchase an adapter that bolts onto your trailer's existing pin box. But adding a new component to your setup can keep your pin box from working how it was designed. King pin adapters can create a stiff ride and can even strain your fifth wheel's frame by adding too much height at the connection point.

A better option is to use this gooseneck-compatible pin box to easily tow your fifth-wheel trailer with your truck's gooseneck hitch. The box replaces your trailer's existing pin box, which means it's designed to act as a part of your trailer instead of simply bolting over your king pin like an adapter does.

Built-In Shock Absorption for a Smooth Ride

Executive torsion

If you've ever towed a fifth-wheel trailer before, you're no stranger to road shock. Driving over uneven terrain can result in a rigid, bumpy ride. And uncomfortable fore-and-aft chucking can occur when you're starting and stopping. When all of the motions combine, the road shock can even potentially damage your truck or trailer.

This Gen-Y Hitch torsion pin box is designed to absorb road shock at the connection point to create a safe, smooth ride. This is thanks to the internal construction of the box, which is similar to that of a torsion axle.

Pivot points are built into the Gen-Y pin box adapter. This allows for movement between the box, which attaches to your trailer, and the coupler tube, which connects to the gooseneck hitch ball in your truck bed. When your trailer bounces or jerks, the coupler tube will move accordingly.

torsion diagram

Built into the Gen-Y pin box are tubes with inner bars that are surrounded by rubber cords. As the coupler end moves, these inner bars twist inside of the tubes, attempting to follow the coupler's motion. But the rubber cords prevent the bars from twisting too far. And as each bar turns, these cords compress to absorb the rough shock. This means that any shock experienced by your truck can be absorbed before it reaches your trailer, and the shock experienced by your trailer won't get transferred to your truck.

Easily Check Your Vertical Load


The vertical load, or pin weight, refers to the weight that a fully loaded trailer exerts downward on the hitch ball in the truck bed. Too little vertical load can cause trailer sway and too much can cause poor performance.

This Gen-Y pin box has a built-in scale so that you can check to see if your vertical load is too high or too low. The red section on the top of the scale indicates your maximum vertical load (4,500 lbs). The red section on the bottom of the scale indicates no vertical load (0 lbs). For the built-in shock absorption to function effectively, the scale's white indicator marker should be within the green section when you hook up your trailer to tow.

GH-8055 GenY Hitch Executive Fifth-Wheel King Pin to Gooseneck Converter with Manual Latch Coupler - LCI 1621/1621 HD - 30,000 lbs

Video of Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 4.5K TW

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

Video Transcript for Review of Gen-Y Hitch Gooseneck and Fifth Wheel Adapters - Gooseneck Pin Box - GY58FR

Hi there. I'm Michael with Today, we're gonna take a quick look at this Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck Pin Box. This is going to replace the factory pin box on your 5th wheel trailer. It's going to allow you to then pull it with your gooseneck hitch. This is designed specifically to replace the Lippert 1621 and 1621HD 5th wheel pin boxes.

So if you have either one of those pin boxes, you can trust this is going to fit right up in place of that original. So it's gonna be very easy or very simple to get mounted. These kind of boxes are of course, very heavy, so you will need at least a couple sets of hands to help you take the original one down, put this one up in its place, but then you can just reuse that original hardware to get it bolted in, and it will be ready to go. So this end is gonna attach right up to where the original pin box is currently attached. And then you're going to have your ball coupler down here, which is going to accommodate your 2 5/16 inch hitch ball in your truck.

Does have the pin latch here, so it's gonna make sure that you have a nice, solid connection there, and it won't be coming off. Now this is a little bit shorter than the 1621 and 1621HD. So you might have a little bit of clearance issues on your tight turns and that sort of thing. So I've got this pretty much level, maybe just a little off level, and you can see it's right about 19 and 1/8 of an inch to the center of that bottom front most hole there, So use that as a reference point for your pin box to see how much of a height difference there is gonna be there and to make sure that it will work for your application. If you are gonna have that reduced clearance, make sure that's not gonna be a huge issue for you.

But this is gonna be a really nice heavy duty steel construction. Gen-Y does have a great reputation for building very robust, solid components. This is gonna be no exception. This does have a 30,000 pound weight capacity. That's the towing capacity, the weight of the trailer plus the load included.

It's gonna have a pin weight capacity range of between 2000 pounds and 4,500 pounds. The reason they have that range is because of our shock absorbing functionality theory. You're gonna need at least 2000 pounds to actually engage the shock absorbing capability and any more than 4,500 is gonna be too much. They're gonna max out the system, you're not gonna get that shock absorbing functionality. So they do include this, a pin weight, or a meter here to monitor your pin weight. So you can see you've got the green and red sticker there, and then that white line. So you wanna make sure that white line is lined up with that green portion. Otherwise you'll need to readjust your load before you start towing, to make sure that that pin weight is gonna be within that appropriate range. Our shock absorbing functionality here is gonna be a really great option, a really great feature to this. If you're not familiar with these arms, you can see here at each pivot point, there's gonna be a square bar with rubber cords all around it. I've got a cutaway to kind of show you how that's gonna look. So you've got these squares here and then the rubber cords all around them. So as you're hitting bumps and going down the road, as those arms pivot, those bars are going to resist. The rubber is going to prevent those bars from turning freely. So it's going to help absorb that shock. So it's going to reduce the amount of chucking and rough fore and aft motions that you get. It's also going to limit your bouncing, jarring up and down motion. So it's gonna make it a much smoother and steady ride for you having that. And it's gonna prevent a shock being transferred back to your trailer from your truck and vice versa back from your trailer up to your truck. So it's gonna make it a much more enjoyable ride, gonna ensure that when you get to your destination, you're not gonna have to worry about dishes falling out of cabinets and that sort of thing, if you're pulling a camper behind you. And this doesn't have any airbags to it, so it's gonna be a lot less maintenance, how there's fewer moving parts that would have to be repaired or replaced. So it is gonna be a really nice option for you to just kinda put it in place and not have to worry about it again. You can see we do have these cross shaped holes that provide the attachment points for your safety chains, so that you'll have that second source of connection there. Like I said Gen-Y does build very robust products. This does have a powder coat finish, that's gonna help resist wear and corrosion, so it's gonna last you a nice long time and it is made here in the USA. So you can trust it's made it to the high quality standards that we've come to know and trust for products that are made here in the US. So if you are looking to switch your 5th wheel trailer over to be pulled by a gooseneck whether you have multiple gooseneck trailers and just the one 5th wheel, you wanted to save yourself the hassle of having to load in that 5th wheel hitch all the time. Or if you just think it'd be easier to hook up to that gooseneck ball in your truck bed and leave all of this attached to the trailer, this is gonna be a great option for you to switch over from that 5th wheel to something that you can connect to that gooseneck ball. So that's gonna complete our look for today. Again, I'm Michael with Thanks for watching..

Customer Reviews

Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck Pin Box - Lippert 1621/1621HD - 30K GTW - 4.5K TW - GY58FR

Average Customer Rating:  4.8 out of 5 stars   (66 Customer Reviews)

This shock-absorbing pin box works with your gooseneck hitch to give a smooth ride while you tow your fifth-wheel trailer. The all-in-1 box has no air bags to refill or small parts to replace. Manual latch allows for simple hookup. 4.5K pin weight.

Ask the Experts about this Gen-Y Hitch Gooseneck and Fifth Wheel Adapters

  • Measuring for 5th Wheel Turning Clearance
    The formula to determine 5th wheel turning clearance is pretty straightforward and is expressed as: (A + B) - C = Clearance A = Distance from center of fifth wheel hitch jaw to truck cab B = Length of Sidewinder arm (22-inches) as with part # RP34FR C = Width of trailer divided by 2 (to get half) For an example, if the distance from the center of the hitch to the cab is 36", 36" + 22" = 58". If your fifth wheel trailer is 102" wide, take half (51"), then plug in: 58" - 51" = 7" of clearance....
    view full answer...
  • Mounting Hardware for Gen-Y Shock Absorbing 5th Wheel-Gooseneck Pin Box
    The Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck Pin Box, # GY58FR is a replacement for the Lippert 1621 and 1621HD pin boxes. It will mount using the hardware that is currently in place with the pin box you have installed on your 5th wheel RV.
    view full answer...
  • How to Determine 5th Wheel Pin Box to Switch to Gooseneck Adapter
    I think we can make things less frustrating, as there is a way to identify your pin box even if you don't have the identifying plate or sticker to tell you exactly what it is. You will need to do a bit of measuring of the bolt holes on your pin box as well as the pin box itself, but this will allow you to determine exactly what you have. I have added a link below to a help article called "Measuring to Determine the Correct Replacement Pin Box for a 5th-Wheel Trailer" which has the exact...
    view full answer...
  • Dimensions For Gen-Y Executive Manual Latch Shock Absorbing 5th Wheel-Gooseneck Pin Box
    I have included a image from Gen-Y that shows the dimensions for their Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck Pin Box # 325-GH-8045. This will allow you to measure from the mounting points for your pin box to determine if you will have the length you need. Do check your weights for your specific camper that you will be installing this pin box as it is rated for 1,500-3,500lbs of tongue and a maximum trailer weight of 21,000lbs. Gen-Y Hitch Shock Absorbing 5th Wheel-Gooseneck...
    view full answer...
    Image 1 for
  • Replacement Saddles and Saddle Pins for B&W Companion Flatbed Gooseneck-to-5th-Wheel Hitch
    To replace the saddle arms and pins for the B&W Companion Flatbed Gooseneck-to-5th-Wheel Trailer Hitch Adapter # BWRVK3050 you're going to need the Replacement Base # BWRVB3055 as well as 2 of the Replacement Saddle Pin # BW3025-119A. These are only rated for 25K towing since that's the weight capacity B&W lists for this hitch. Since you're looking for something with a higher weight rating you're either going to need to go with a completely different hitch setup or use the B&W gooseneck...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Mike S
Updated by:
Mike S
Employee Alexander C
Written by:
Alexander C
Employee Michael B
Installed by:
Michael B

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