maXpeedingrods PB51GB
maXpeedingrods 7500 lbs Rear Air Suspension Bags Kit
Model: PB51GB
For Ford F-250 F-350 4WD 2011-2016, F-450 4WD 2011-2014
1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your maXpeedingrods 7500 lbs Rear Air Suspension Bags Kit. This air helper spring kit is designed to enhance vehicle stability, improve handling, and provide load-leveling capability for your Ford truck, especially when hauling or towing heavy loads. Proper installation and maintenance are crucial for optimal performance and longevity of the system.
2. Application & Compatibility
This air suspension kit is specifically designed for the following vehicle models:
- Ford F-250 Super Duty Pickup 4WD (2011-2016)
- Ford F-350 Super Duty Pickup 4WD (2011-2016)
- Ford F-450 Super Duty Non-Commercial Chassis 4WD (2011-2014)
The kit is compatible with most side-mount fifth wheel hitch setups and factory-installed in-bed hitch systems. It is not suitable for cab & chassis applications.
Vehicle Modification Compatibility
The air suspension kit's fitment can be affected by prior vehicle modifications:

This image illustrates vehicle modification compatibility. If the rear of your vehicle is lifted, an additional spacer may be required to support the kit. If only the front of your vehicle is lifted, the kit will fit. If both the front and rear of your vehicle are lowered, the kit will not fit.
3. Package Contents
Before beginning installation, verify that all components listed below are present in your kit:

This image displays the complete contents of the maXpeedingrods air suspension kit, including air bags, mounting hardware, air lines, and brackets.

A detailed breakdown of the package contents, showing two air bags, four roll plates, various upper and lower mounting brackets, a hardware kit (bolts, nuts, washers, clamps, zip ties), and an air line.
- 2 x Air Suspension Bags
- 4 x Upper and Lower Mounting Brackets (Premium Q235 Steel)
- 2 x Elbow Air Fittings
- 2 x Inflation Valves
- 1 x Air Line
- Hardware Kit (including bolts with Dacromet Anti-Rust surface treatment, nuts, washers, clamps, zip ties)
4. Installation Guide
Installation should be performed by a qualified technician or an individual with experience in automotive suspension systems. Always follow proper safety procedures, including wearing appropriate personal protective equipment and using jack stands to secure the vehicle.
General Installation Steps:
- Prepare Vehicle: Park the vehicle on a level surface, engage the parking brake, and block the wheels. Lift the rear of the vehicle using a jack and support it securely with jack stands. Remove the rear wheels if necessary for access.
- Remove Existing Components (if applicable): Carefully remove any existing suspension components that will be replaced by the air bag kit, following the vehicle manufacturer's guidelines.
- Install Mounting Brackets: Attach the upper and lower mounting brackets to the vehicle's frame and axle, respectively, using the provided hardware. Ensure all bolts are tightened to the manufacturer's specifications. The brackets are made from Premium Q235 Steel with Dacromet Anti-Rust treatment for durability.
- Install Air Bags: Position the air bags between the upper and lower brackets. Secure them firmly using the designated fasteners.
- Connect Air Lines: Attach the air lines to the air bags using the elbow air fittings. Route the air lines away from hot exhaust components, sharp edges, and moving parts. Secure the lines with zip ties or clamps as needed.
- Install Inflation Valves: Mount the inflation valves in an accessible location, such as the bumper or a convenient spot on the vehicle's body. Connect the other end of the air lines to these valves.
- Initial Inflation & Leak Test: Inflate the air bags to a low pressure (e.g., 20 PSI) and perform a leak test.
- Final Assembly: Reinstall any removed components, including the wheels. Lower the vehicle to the ground.
Preventing Leaks During Installation:

This image provides crucial tips for preventing air leaks. Ensure a perfectly smooth and tight seal when cutting the air line. Verify that the air line is properly placed and routed. Use a spray bottle with soap and water to spray all fittings and the air bag itself to easily detect leaks.
- Ensure air lines are cut cleanly and squarely to create a perfectly smooth and tight seal.
- Verify that the air line is properly placed and routed, avoiding kinks or sharp bends.
- Use a spray bottle filled with soap and water to spray down all fittings and the air bag itself. Bubbles indicate a leak.
5. Operation
The maXpeedingrods air suspension kit allows for adjustable air pressure to suit various load conditions and driving preferences.
- Load Leveling Capability: The system provides up to 7,500 pounds of load leveling capability.
- Adjustable Pressure: Air pressure can be adjusted from 5 PSI (minimum) to 100 PSI (maximum).
- Adjusting Pressure: Use an air compressor to inflate the air bags via the inflation valves. A pressure gauge is recommended to monitor the PSI. Deflate by pressing the valve stem.
- Optimal Pressure: Adjust the air pressure based on the load being carried and road conditions to achieve a safe and comfortable ride. Higher loads typically require higher air pressure.

This image highlights the impressive load leveling capacity of up to 7500 lbs provided by the air suspension bags.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your air suspension kit.
- Regular Inspection: Periodically inspect the air bags, air lines, and fittings for any signs of wear, damage, or leaks.
- Check Air Pressure: Maintain appropriate air pressure, especially before and during towing or hauling. Avoid operating the system below 5 PSI or above 100 PSI.
- Clean Components: Keep the air bags and surrounding components clean from dirt, debris, and corrosive materials.
- Material Durability: The air bags feature high-strength ST12 steel end caps, thicker rubber air sleeves and seals, and a multi-ply rubber structure for enhanced durability and longevity.

This image illustrates the durable construction of the air bags, featuring high-strength ST12 steel end caps, thicker rubber air sleeves and seals, and a multi-ply rubber structure for increased resilience.
7. Troubleshooting
Common Issue: Air Leaks
If you experience a loss of air pressure, an air leak is the most common cause. Follow these steps to identify and resolve leaks:
- Prepare Solution: Mix a solution of soap and water in a spray bottle.
- Spray Components: Spray all air fittings, air lines, and the entire surface of the air bags with the soap solution.
- Observe for Bubbles: Look for bubbles forming, which indicate the location of an air leak.
- Repair/Replace: Once a leak is identified, tighten the fitting, re-cut and re-seat the air line, or replace the damaged component as necessary. Refer to the "Preventing Leaks During Installation" section for proper air line preparation.
8. Specifications
| Specification | Detail |
|---|---|
| Product Model Number | PB51GB |
| Load Leveling Capacity | Up to 7,500 lbs |
| Adjustable Air Pressure Range | 5 PSI to 100 PSI |
| Product Dimensions | 17.99 x 12.99 x 11.5 inches |
| Item Weight | 47.1 pounds |
| Material (Air Bags) | High-strength ST12 Steel End Caps, Thicker Rubber Air Sleeves and Seals, Multi-Ply Rubber Structure |
| Material (Brackets) | Premium Q235 Steel with Dacromet Anti-Rust Treatment |
| Position | Rear Left, Rear Right |
| Burst Pressure | ≥2.0MPa |

This image highlights that the air bags undergo fatigue testing over 5,000,000 times to ensure driving comfort and safety.

This image demonstrates the high compressive strength of the air bags, with a burst pressure rating of ≥2.0MPa, contributing to less noise and improved performance.
9. Warranty and Support
maXpeedingrods stands behind the quality of its products.
- Warranty: maXpeedingrods warrants its products against manufacturing defects under normal use for 1 year from the date of purchase.
- Customer Service: Technical support and customer service are available to assist with any questions or issues you may encounter. Please refer to your purchase documentation for contact information.
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