RETRUE Air Bag Replacement for Firestone 6401 2500 lbs

Restore towing stability with the RETRUE Firestone 6401 replacement air bags, built to reduce rear-end squat, trailer sway, bounce, and uneven ride height. This double bellows air bag suspension part supports RVs, campers, trailers, utility equipment, and heavy cargo hauling.

2,500 lbs Load Leveling Capacity:
Provides dependable rear suspension support to help maintain vehicle leveling and safer towing control.

Double Bellows Air Spring Design:
Dual-bellow construction improves shock absorption, ride comfort, and air suspension kit performance under load.

Adjustable 5–100 PSI Pressure:
Customize firmness based on trailer weight, cargo load, and road conditions for better suspension balance.

Compatible Firestone 6401 Replacement:
Direct-fit replacement for compatible air spring suspension systems using Firestone 6401-style bags.

Heavy-Duty Rubber Construction:
Reinforced rubber helps resist cracking, pressure fatigue, and long-term wear.

Hardware Included:
Includes air fitting and mounting hardware for convenient installation.

Compatible with air suspension systems using Firestone 6401-style replacement air bags, including select:
·Pickup Trucks
·Heavy-Duty Trucks
·Utility Trailers
·RV Trailers
·Campers
·Commercial Vehicles
·Load-Leveling Air Suspension Systems
·Rear Air Helper Spring Kits

Compatible with select aftermarket air suspension systems using Firestone 6401 air bag dimensions and mounting configuration.

Shipping:
We ship our products primarily through USPS/UPS. All items will be shipped within 72 business hours upon receipt of payment (except Saturday and Sunday). Orders placed on weekend will be shipped within 4 days.

Returns:
Items purchased from RETRUE may be returned in original unused condition within 30 days from the date of purchase for a refund, to the original form of payment. All returns must be pre-approved by RETRUE. Otherwise, unauthorized returns will not be accepted.

Warranty: Air Springs: Limited Lifetime
Hardware & Brackets of Air Springs: 2 Years
Bumpers, Hardware, Fittings & Air Line of Air Accessories: 2 Years
Hardware & Brackets of Air Accessories: 1–2 Years (depending on model; view product warranty documents for details)

Product Type: Air Bag Replacement

Replacement For: Firestone 6401

Load Leveling Capacity: Up to 2,500 lbs

Air Pressure Range: 5-100 PSI

Design Type: Double Bellows Air Spring

Material: Reinforced Heavy-Duty Rubber

Top Thread Size: 3/4-16 UNF

Bottom Thread Size: 3/8-16 UNC

Diameter: 5.32" (135 mm)

Height Uninflated: 5.5" (139.7 mm)

Height Fully Inflated: 7.0" (177.8 mm)

Width: 6.93" (176 mm)

Maximum Expanded Height: 7.99" (203 mm)

Color: Black / Silver

Installation Type: Bolt-On Replacement

Included Components:
·Air Spring x1
·Air Fitting x1
·Hex Nut x1
·Flat Head Bolt x1
·Flange Bolt x1
·Toothed Lock Washer x1

Q1. What does this air bag replacement do?
A: This replacement air spring helps restore load leveling performance, reduce rear-end sag, improve towing stability, and minimize trailer sway while hauling heavy loads.

Q2. Is this compatible with Firestone 6401 systems?
A: Yes. This air bag is designed as a compatible replacement for Firestone 6401 air suspension bags.

Q3. What is the maximum load support capacity?
A: This air spring provides up to 2,500 lbs of load leveling support for towing and hauling applications.

Q4. Can I adjust the air pressure?
A: Yes. The air bag supports adjustable air pressure from 5 PSI to 100 PSI depending on your towing or cargo needs.

Q5. Does this include installation hardware?
A: Yes. The package includes an air fitting, hex nut, flange bolt, flat head bolt, and toothed lock washer.