How to Determine Fifth Wheel Pin Box Model
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
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
![Kyle S](https://images.etrailer.com/static/images/catg/people/1237_tn.jpg)
Products Referenced in This Question
Trailair Air Ride 5th Wheel Pin Box - Lippert 1116 - 21,000 lbs
- Fifth Wheel King Pin
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs GTW
- Fixed Turret
- Lippert 1116
- Lippert
more information >
Curt Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs
- Fifth Wheel King Pin
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs GTW
- Fixed Turret
- Lippert 1621HD
- Lippert
more information >
Trailair Flex Air 5th Wheel Pin Box - Lippert 0719 - 18,000 lbs
- Fifth Wheel King Pin
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 18000 lbs GTW
- Fixed Turret
- Lippert 0719
- Lippert
more information >
Trailair Air Ride 5th Wheel King Pin - Leland 7920 - 21,000 lbs
- Fifth Wheel King Pin
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs GTW
- Fixed Turret
- Leland 7920
- Lippert
more information >
Trailair Air Ride 5th Wheel King Pin - Steelco/Davis, Venture - 21,000 lbs
- Fifth Wheel King Pin
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs GTW
- Fixed Turret
- Venture CJ20515
- Venture CJ20517
- Steelco-Davis PB02
- Steelco-Davis PB02W
- Lippert
more information >
Trailair Air Ride 5th Wheel King Pin - Fabex 750, 765 and 770, RBW 7028 - 21,000 lbs
- Fifth Wheel King Pin
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs GTW
- Fixed Turret
- Fabex 750
- Fabex 765
- Fabex 770
- RBW 7028
- Lippert
more information >
Trailair Air Ride 5th Wheel King Pin - Fabex 730, RBW 7019 - 21,000 lbs
- Fifth Wheel King Pin
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 21000 lbs GTW
- Fixed Turret
- Fabex 730
- RBW 7019
- Curt
more information >
Product Page this Question was Asked From
Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 18,000 lbs
- Fifth Wheel King Pin
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 18000 lbs GTW
- Fixed Turret
- Lippert 1621
- CURT
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Shop: Gen-Y Hitch 5th Wheel to Gooseneck Pin Box - Auto Latch - Lippert 1621/1621 HD - 21K - 3.5K TW
- Article: Fifth Wheel Trailer Hitch Information and Installation Tips
- Shop: Firestone Ride-Rite Red Label Extreme Duty Air Helper Springs - Rear Axle
- Shop: Air Lift WirelessONE Compressor System for Air Helper Springs - Remote - Bluetooth - EZ Mount
- Shop: Suspension Enhancement
- Article: Best Boat Accessories for Fishing
- Article: 5th Wheel to Gooseneck Adapters
- Article: Gooseneck to 5th Wheel Adapters
- Article: Sidewinder Fifth Wheel Compatibility
- Shop: Brake Buddy Stealth Supplemental Braking System - Proportional
- Search Results: gen~y hitch
- Search Results: gh~8000
- Article: Putco 2010 Products
- Q&A: Dimensions of Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box for Lippert 1621
- Q&A: What Gen-Y 5th-Wheel to Gooseneck Pin Box do You Recommend for My 3,500 Pound Tongue Weight?
- Q&A: Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box to Replace Lippert 1621
- Q&A: Correct Gen-Y Hitch Shock Absorbing 5th Wheel to Gooseneck Pin Box for 2014 Redwood RV
- Video: Review of Gen-Y Hitch Gooseneck and Fifth Wheel Adapters - 5W Gooseneck Adapter - GY58GR
- Shop: Vehicle Tow Bar Brake System
- Shop: Air Lift LoadLifter 5000 Air Helper Springs - Rear Axle
- Shop: Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter - 20,000 lbs
- Shop: B&W Ball and Safety Chain Kit for Ford, GM, Chevy, and Nissan Titan XD Underbed Gooseneck Hitch
- Search Results: 94720
- Search Results: gen x
- Q&A: Recommended 5th Wheel to Gooseneck Adapter for a 1621 Pin Box
- Video: Air Lift WirelessONE Compressor System Installation - 2022 GMC Sierra 2500
- Shop: Gooseneck Hitch
- Search Results: front stabilizer
- Q&A: Is the MORryde Cushioned 5th Wheel Pin Box # MR84VR The Same Length as a Lippert 1621?