Recommended Replacement 5th Wheel Pin Box
Updated 09/08/2015 | Published 09/05/2015
Question:
I need to extend my pin box on my fifth wheel. the pin box is about 8 1/2 inch wide center to center on the bolts is 7 1/8 it has a 5 bolts on each side . what pin box will work to extend my pin box.
asked by: Eric S
Expert Reply:
The best way to select a replacement 5th wheel pin box, such as a Reese Sidewinder that provides better turning clearance for short bed trucks, is to use the original pin box manufacturer's part number. This is usually on a sticker on the driver's side. The Trailair Flex Air pin box # LC328492 that you referenced is a direct replacement for the Lippert 1621 pin box as shown on the linked page.
You can use the linked article on Sidewinders to match your current pin box brand and part number; this will then tell you the replacement Sidewinder that will bolt up in its place.
Product Page this Question was Asked From
Curt Flex Air 5th Wheel Pin Box - Lippert 1621 - 18,000 lbs
- 5th Wheel Pin Box
- Upgraded Pin Box
- Absorbs Road Shock and Reduces Chucking
- 18000 lbs
- Air Ride Suspension
- Fixed Turret
- Lippert 1621
- CURT
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Article: Which RV Propane Tank Size Do I Need?
- Article: Trailer Lighting Requirements
- Search Results: ice maker
- Search Results: manifold
- Search Results: light switch
- Search Results: quick connect hose
- Search Results: nautilus p4
- Search Results: outdoor shower
- Q&A: Replacement for Atwood GC10A-4E Water Heater
- Q&A: Does etrailer Carry Dometic WH-10GEA Water Heater to Replace Atwood GCH10A-3E
- Search Results: water heater door
- Article: How to Measure for Motorhome Steps
- Shop: GE Profile RV Refrigerator w/ Freezer - 10 cu ft - 12V - Stainless Steel
- Shop: Norcold Polar Full RV Refrigerator w Freezer - 9.7 Cu Ft - 12V - Stainless Steel - Left Hand Doors
- Shop: MaxxFan Deluxe Roof Vent w/ 12V Fan, Thermostat, and Remote - Powered Lift - 10 Speed - Smoke
- Shop: Marble Vinyl Flooring - Black - 65 to 67 Mil - 18' Long x 8'4" Wide
- Video: Inside Watchdog Surge Protectors: How They Keep Your RV Safe
- Video: Fogatti Reveals Their Secret to Reliable Winter Heat
- Video: Review of GE Appliances RV Refrigerators - Full Fridge with Freezer - GE78FR
- Video: A Closer Look at the Peterson LED Identification Light Bar for Trailers over 80"
- Video: Install: Timbren Rear Suspension Enhancement System on a 2009 Dodge Ram Pickup
- Video: Review of Furrion RV Refrigerators - Arctic RV Refrigerator Freezer Right Opening - FR66GD
- Video: All You Need to Know About the B and B 15' Coil Water Hose with 1/4" Quick Connect
- Shop: GE Profile Propane RV Rangetop - 2 Burners - 12" Wide - Stainless Steel
- Shop: GE RV Refrigerator w/ Freezer - 9.8 Cu. Ft. - 12V - Stainless Steel Glass Front
- Shop: Greystone Electric RV Induction Cooktop - 2 Burners - 20-1/2" Wide - Ceramic Black Glass
- Q&A: Cushioned Pin Box Recommendation for 2025 Grand Design Solitude 27D
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Q&A: What is the Difference Between Demo Autoslide # DM39SV and # DM29GV for 2026 GMC?
- Q&A: Replacement Sidewinder for Trailair Flex Air
on 5th Wheel Pin Box
