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.

Replacement Application: Firestone 6401

Compatible Firestone Air Spring Kit Models: 2299, 2550, 2613, 2597, 2616

Other Kit Models: Not Compatible

Product Type: Single Replacement Air Spring

Quantity: 1 Air Spring

Air Spring Design: Double-Bellows

Mounting Brackets: Upper and Lower Mounting Brackets Not Included

Air Fitting: Included

Mounting Hardware: Included as Listed

Air Line: Not Included Unless Separately Specified

Operating Pressure: 5–100 PSI

Load Support: Up to 2,500 lbs, Subject to Final Technical Verification

Fitment Note: Verify the existing Firestone kit model, air spring dimensions, threaded connections, and mounting arrangement before purchase. This is a replacement component, not a complete air suspension kit.

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: Replacement Air Spring

Product Model: RAK6401

Replacement Reference: Firestone 6401

Compatible Kit Models: Firestone 2299, 2550, 2613, 2597, 2616

Package Quantity: 1 Air Spring

Air Spring Design: Double-Bellows

Construction: Rubber Bellows with Metal Mounting Plates

Operating Pressure: 5–100 PSI

Listed Load Support: Up to 2,500 lbs, Pending Final Engineering Verification

Upper Thread: 3/4-16 UNF

Lower Thread: 3/8-16 UNC

Bead Plate Diameter: 5.32 Inches (135 mm)

Uninflated Width: 6.93 Inches (176 mm)

Uninflated Height: 5.5 Inches (139.7 mm)

Fully Inflated Width: 7.99 Inches (203 mm)

Fully Inflated Height: 7.0 Inches (177.8 mm)

Included Components: 1 Air Spring, 1 Air Fitting, and Listed Mounting Hardware

Upper Mounting Bracket: Not Included

Lower Mounting Bracket: Not Included

Air Line: Not Included Unless Separately Specified

Application: Replacement for Compatible Existing Air Spring Systems

Q1: What is a Firestone 6401 air spring replacement?
A: A Firestone 6401 air spring replacement is designed to replace worn air suspension springs and help restore vehicle ride height, load support, and suspension reliability.

Q2: How long do air suspension springs last?
A: Air spring lifespan depends on driving conditions, load frequency, weather exposure, and maintenance. Regular inspection can help identify wear and prevent unexpected failure.

Q3: What causes air suspension bags to fail?
A: Common causes include rubber aging, air leaks, road debris damage, excessive loads, and improper installation.

Q4: Can an air spring replacement improve towing performance?
A: Yes. A properly functioning air spring helps maintain suspension height and provides better support when towing trailers or carrying heavy cargo.

Q5: Is this air spring replacement easy to install?
A: The replacement includes an air fitting and mounting bolts, making installation more convenient for replacing damaged air suspension components.