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Curt Flex Air 5th Wheel Pin Box Installation - 2007 Starcraft Homestead Lite Fifth Wheel

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How to Install the Curt Flex Air 5th Wheel Pin Box on a 2007 Starcraft Homestead Lite Fifth Wheel


Hey everybody, how's it going Today, we're gonna be going over and showing you how to install the Curt Flex Air 5th Wheel Pin Box, here on our 2007 StarCraft Homestead. So, a standard pin box on your trailer, isn't gonna have the pivoting head, it's not gonna have a built-in strut and it's not gonna have an airbag. Now, you're probably thinking, why do we need all this So I wouldn't say it's a requirement, but your standard pin boxes, they're basically gonna be transferring all the road shocks, when we hit a pothole, we're going over some bumps in the road, everything is gonna be transferred directly to the vehicle and you're gonna be feeling all those bumps in the road. It's actually gonna rely on the vehicle suspension and partly the trailer suspension. But when you add a cushioning mechanism between the truck and the trailer here, this thing is gonna absorb all that road shock there, so we're not gonna be transferring it to our vehicle. So overall, it's gonna be making our ride that much more pleasurable, and it's also gonna help maintain our 5th wheel trailer here, because it's not gonna be rattling around as much.

A lot of those road shocks and vibrations are gonna be absorbed into one of these three men mechanisms here to make for an overall, a smoother ride, and it's gonna cut down on that chucking and jarring feeling. You're not gonna have any of those issues that you would normally, by upgrading your pin box. It's not only gonna cut down on the wear and tear of our trailer, it's also gonna cut down on the maintenance that are required for our tow vehicle. Because the trailer isn't gonna be bouncing around as much therefore, the suspension on our vehicle isn't gonna incur that much wear. So another common question we get here at etrailer when someone's wanting to replace their pin box, is they're worried about the dimensions.

Whether they wanna gain height or they wanna decrease height, or they're looking to increase their turning radius. Now, unfortunately, you really can't gain or lose anything from a new pin box, because all these are gonna be mirrored towards the same shape of the one they're gonna be replacing, which is that Lippert 1621. Therefore, the distance from the bolt holes to the center of the king pin here, or the distance from the bolt holes to the bottom of the skid plate is gonna be the same pretty much for all Lippert 1621 pin boxes. So, all of our pin box components are gonna be made of a very thick and sturdy steel, and they also have a nice durable black powder coated finish, which is really gonna protect our 5th wheel or our pin box here, from rust and corrosion. A lot of the times you're banging these on the 5th wheel hitch, trying to back them up, so they are kind of an abused item.

Really, there's gonna be a lot of subjected wear to these things, so, you make sure that they're gonna be stout, and it's really important that powder coating holds up. Because if you nick and scratch this and expose the bare metal underneath, they will rust. Having that nice durable finish there is really gonna help protect that metal from time to come. And I would also like to point out here, that this 5th wheel hitch is made in the USA, so you know you're getting a quality product. So, one thing you do need to be you aware about with this particular pin box here and all cushion pin boxes, is that you can't use any sort of 5th wheeled or gooseneck adapter, such as the ones that bolt to the bottom of the skid plate here.

So, just keep that in mind, you won't be able to use any of those adapters. So, in regards to installation, this isn't really bad at all because let's face it, it's actually only four bolts per side. So, there's no cutting drilling or welding whatsoever required. But these things are heavy. I mean, they can weigh a couple hundred pounds, so, it is gonna be hard to get the 5th wheel hitch into position and remove the old one. But if you got a couple buddies around, usually about four people are able to manage getting this installed in place. Obviously, the most ideal thing would be to have a forklift of some kind or some sort of lifting device, you guys can get creative here, but aside from that, nothing is particularly challenging, they're just heavy. So now that we've gone over the pin box, let's go ahead and show you how to get it installed. Before we get the pin box off, you wanna go ahead and just mark, which sets of holes your bolts go through, that way when you put the new pin box on it's gonna have the same height or the same rise/drop as the old one. So, chances are, you should be able to tell from the worn paint where our old bolts move, but if you have a paint marker, just go ahead and mark those. At this time, if you've purchased a different truck recently or the pin box is a little bit different dimensions, you can actually go ahead and measure now, that way you can ensure you're installing in the correct holes. You can actually move the pin box up or down within these holes, to give you more height or decrease the height. But again, that's really gonna be depending on your specific setup there, so, if you still have the same truck, most of these pin boxes are the same dimensions, so, you should just be reusing the same ones. But if you did wanna go ahead and lower or raise the pin box within the wings here on the trailer, now would be the time to do so. So, coming out the loft on the trailer here at the back we have our electrical cable. This is our Seven-Way, and then we have our breakaway. So, we wanna make sure those aren't getting tinged up within the pin box here. So, I just have them sort of going towards the back of the trailer and just sort of wrapped up on the side here, that way they're not gonna interfere with the installation of our pin box. Now with a few extra sets of hands, we can go ahead and raise our pin box into position. We'll be using a forklift here because we have one available. Now, keep in mind, your pin box does not come with new hardware, so you will need to secure it using the hardware from your old pin box. So, once I get all of our nuts on our washers on, we'll go ahead and lower our support device for the pin box, and then we can tighten everything down. So, something we do wanna be aware of when we're reusing our old hardware. So, this particular pin box has sort of a double plate construction. So, there's two plates here, which is gonna add to the thickness, therefore, we need to be sure that our bolt is gonna be long enough that the nut secure can secure on it properly. So, depending on how long your old bolts we're or the construction of your old pin box, you may or may not need to search for new hardware, just make sure you have proper thread engagement with your bolts. So, now we need to begin tightening and torquing all of our hardware. Now, the size tools you're gonna need for this are gonna vary depending on which bolts you use. Now, I will say some of these bolts back here are kind of hard to get a wrench on, so, you may need to use a combination of tools. We're gonna be using a box wrench inside and then we're gonna be using our ratchet on the outside. So, just take the time and snug up each of these bolts. Once we get them snug, we'll come back with our torque wrench and we'll torque everything to spec. We'll go ahead now. Just begin torquing each fastener. That's gonna do it today for our look and our installation of the Curt Flex Air 5th Wheel Pin Box..


Info for this part was:

Employee Dustin K
Video Edited:
Dustin K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Conner L
Test Fit:
Conner L
Employee Michael B
Installed by:
Michael B

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