How to Determine Fifth Wheel Pin Box Model

Question

Question:

I have a 2014 Heartland Gateway 3650BH 5th wheel with a factory standard pin box, I need to replace with a FlexAir pin box. I do not have the factory pin box part number. Which FlexAir pin box should I buy for replacement?

asked by: Tendayi M

0

Expert Reply:

If you are unable to contact your trailer's manufacturer with your VIN to find the factory pin box model number there are some steps you can take which will allow you to determine what pin box model you have so you can purchase a new FlexAir.

To do this you will need to follow the steps in the linked help article, which I will go over with you. Start by selecting your pin box style like in the accompanying photo (which you will also find in the help article). You will then need to use that drawing and measure the horizontal bolt hole distance, vertical bolt hole distance, bolt size, bolt head size, front row of bolts to king pin, back row of bolts to king pin and pin box width.

When you have these measurements you will need to compare those to the chart in the aforementioned linked help article and find the pin box with the matching dimensions.

For example, if you had 7-7/8" horizontal bolt hole distance, 2" vertical bolt hole distance, 5/8" bolt size, 15/16" bolt head size, measured 17-3/4" from the front row of bolts to the king pin, 25-5/8" from the back row of bolts to the king pin and a 12" pin box width you have a Lippert 1621 pin box and need the Curt Flex Air # LC328492.

The following are the other options depending on your pin box:

- Lippert 0719: # LC328484
- Lippert 1621HD: # LC158778
- Lippert 1116: # LC155943
- Leland 7920: # UF35-946208
- Fabex 750, 765 and 770, RBW 7028: # UF35-946212
- Fabex 730, RBW 7019: # UF35-946215
- Steelco/Davis, Venture: # UF35-946211

expert reply by: Kyle S

0

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Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

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Answer 6

I spoke with my contact at Trailair and from your serial number we were able to determine that your trailer came with a 1621 HD pin box which is a long pin box style. I was unable to obtain the exact part number for your Trailair pin box but from the…

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Answer 7

The Gen-Y #GY66FR shock absorbing 5th wheel to gooseneck pin box you'd looked at is a compatible replacement for your Lippert 1621 pin box. The Gen-Y replacement has a 25K towing/ 5.5K pin weight capacity, which sounds like it's more capacity…

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Answer 8

Thanks so much for including pictures of your setup! We confirmed that the brackets that you have for your provided serial number correspond to a 1621 Lippert bracket. With this bracket setup and the fact that you are going to add additional…

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Answer 9

The Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box #GY58GR has dimensions comparable to the Lippert 1621 it is designed to replace. Typically replacement pin boxes like this one keep the same or very similar clearance to the original. It…

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Answer 10

The dimensions of the Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box part #GY58GR are mirrored after that of the pin box it is designed to replace. In other words, pretty much every pin box that will bolt up to the Lippert 1621 pattern…

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Answer 11

Thanks for the picture! That is exactly what I need to confirm what pin box your Forest River Shasta Phoenix 28RB has. I just spoke with my rep at Lippert and you have a 1621 pin box with an 18,000 lbs capacity. You will want the Gen-Y Hitch 5th…

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Answer 12

There is not one specific recommended pressure for the air bag in the Trailair Air Ride 5th Wheel Pin Box #LC155943. The bag's pressure can range from 20 to 120 psi depending on your situation. After some miles you'll likely find the sweet…

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How to Determine Fifth Wheel Pin Box Model

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