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  1. Vehicle Suspension
  2. Pacbrake
  3. Air Springs
  4. Towing/Load Leveling
  5. Heavy Duty
  6. Rear Axle Suspension Enhancement
THIS ITEM IS NOT A FIT FOR
2021 Ford F-450 Cab and Chassis
Pacbrake

Pacbrake Alpha HD Air Bag Suspension Kit - Rear Axle - 5,000 lbs

Part Number: PB42RV
In Stock
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$415.01
Retail:$461.12
You Save: $46.11
Vehicle Suspension
Not Confirmed to Fit

2021 Ford F-450 Cab and Chassis

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5,000-lb Capacity. When the load gets heavy, your truck shouldn't feel like it's fighting you. These air bags help you stay level and in control so you can tow with confidence and handle heavy loads without second-guessing your suspension. Great Prices for the best vehicle suspension from Pacbrake. Pacbrake Alpha HD Air Bag Suspension Kit - Rear Axle - 5,000 lbs part number PB42RV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (25)
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  • Videos (2)
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Pacbrake Vehicle Suspension - PB42RV

  • Air Springs
  • Towing/Load Leveling
  • Pacbrake
  • Heavy Duty
  • Rear Axle Suspension Enhancement
  • Suspension Only

5,000-lb Capacity. When the load gets heavy, your truck shouldn't feel like it's fighting you. These air bags help you stay level and in control so you can tow with confidence and handle heavy loads without second-guessing your suspension.


Highlights

  • Custom Fit for Your Vehicle: Precision brackets bolt to factory attachment points.
  • 5,000-lb Load Support: Adds rear axle support for towing, hauling, and bed-loaded stability.
  • Improved Ride Stability: Reduces rear-end sag, sway, and bounce for better handling under load.
  • Adjustable Air Pressure: Set support between 5 psi and 100 psi depending on your load.
  • Complete Kit, No Drilling: Includes laser-cut brackets, push-to-connect fittings, and all hardware.
  • Ready Now, Upgrade Later: Use manual inflation or connect to an onboard air system when you're ready.

Features to know about

Control and Cushion When It Counts

When the load gets heavy, your truck needs more than just rear springs hanging on for dear life. Alpha HD air springs add up to 5,000 lbs of rear axle support, keeping your truck steady even when the trailer is loaded, the bed is packed, and the miles are long. No more rear-end sag throwing off your braking and steering, or headlights pointing into the sky. With air bag support underneath, you keep control of your ride even when you're towing a travel trailer or moving a serious payload.

Dial in the Ride for Any Load

Every load is different, and this system adjusts to match. Alpha HD air springs let you fine-tune ride height and firmness with air pressure from 5 to 100 psi. When carrying heavy weight, add air to level your suspension and maintain steady handling. Running without a load? Drop to the minimum pressure for a smoother, more compliant ride without stiffness or bounce. Manual inflation valves are included, so tuning your setup for each trip is straightforward and dependable.

Built Tough for Work and Weather

Air bags are only as strong as their weakest link. That's why Alpha HD bags are reinforced from end to end with heavy-duty end caps, 20 internal support wires, and powder-coated steel brackets. Add corrosion-resistant hardware and thick roll plates, and you've got gear that holds up to real-world hauling through heat, cold, salt, and slop.

Installation That Doesn't Waste Your Weekend

Adding serious load support shouldn't mean losing a whole weekend. The precision laser-cut brackets are designed to bolt cleanly to your truck's existing mounting points with minimal drilling. Just smart engineering that fits the way it should, which is perfect for the DIYer. Manual valves mount through license plate fastener holes or a location of your choosing (which may require drilling). With high-quality fittings, pre-bent brackets, and mounting hardware included, you'll be back on the road in just a few hours without a trip to the fab shop.

Flexible for Today, Ready for What's Next

This kit is designed to work with your setup today and wherever your upgrades take you tomorrow. You can inflate manually with standard air valves right out of the box, no extra parts needed. Already have an onboard compressor? The Alpha HD system connects easily to most existing setups. Planning for an in-cab wireless controller down the road? No problem. The foundation is already built in, making it easy to expand your control options when you're ready.

Specs:

Weight & Capacity:

  • Load support: up to 5,000 lbs of additional leveling support
  • Air springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.

Adjustability:

  • Air pressure range: 5 psi 100 psi; maintain minimum 5 psi when unloaded

Estimated Install Time:

  • Professional install: 2-1/2 hrs
  • DIY: 4 hrs, depending on tools and experience. Plan for extra time if this is your first air spring install or you're working in a driveway setup.

Warranty:

  • Limited lifetime on air bags
  • 2-Year or 24,000 miles on mounting brackets, fasteners, and spacers

Included Components:

  • Pacbrake Alpha HD air springs (rear axle)
  • Precision laser-cut powder-coated steel brackets
  • Grade 5 plated hardware
  • Air lines, push-to-connect fittings, inflation valves, installation instructions


HP10604 Pacbrake Alpha HD Rear Air Suspension - 5,000 lbs - Manual Inflation Valves

Installation Details PB42RV Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Video of Pacbrake Alpha HD Air Bag Suspension Kit - Rear Axle - 5,000 lbs

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of Pacbrake Vehicle Suspension - Alpha HD Rear Axle Double Convoluted Air Bags - PB42RV

Hi everybody, Andy here with etrailer.com. Let's take a real quick look at this Pacbrake Alpha HD rear axle double convoluted airbag suspension kit. Now this kit has been designed to fit your 2022 and newer Toyota Tundra, both the two and four wheel drive models. And on custom fit parts such as this kit, I do recommend taking advantage of our vehicle fit guide here at etrailer.com. Simply input the year, make, and model of your vehicle and our fit guide will confirm if this kit will work for you or if we have something comparable that will work for you. So when the load gets heavy, your truck is going to need more than just those rear springs that your truck currently has that are hanging on for dear life.

These airbags are going to add up to 5,000 pounds of rear axle support, keeping your truck level and steady even when your trailer is loaded, the bed is packed, and the miles are long. So no more rear sag throwing off your braking and steering or your headlights pointing into the sky. As you know, every haul is going to be different. That's why these air springs are going to give you full control over the ride height and firmness with adjustable air pressure from five to 100 PSI. So if you're hauling a fifth wheel or a full bed of gravel, you're just going to crank up the air pressure, and then when you're unloaded and heading back home, you can just drop that pressure back down for a softer ride.

With the manual inflation valves and the airline that we have here, you're gonna be able to tune that suspension for the day's work. It's gonna be very straightforward, very easy. So extreme hauling demands extreme durability, and these springs are built with one inch the corrosion resistant end caps on the bags that you can't see because I do have these kind of loosely assembled here. So the plates here are obscuring the view of those end caps, but those end caps are gonna make these bags all the more durable along with being reinforced with 20 internal support wires for maximum strength under a load. Now I mentioned these roll plates, these are heavy duty roll plates.

They're gonna protect the bags from chafing and extend the lifespan. And then these powder coated steel brackets, they're custom fit, they're gonna fight back against rust, road salt, and rough seasons. If it's bitter cold, there's a scorching heat, or mud slick job sites, this system is made to outlast whatever the road dishes out, mile after mile and load after load. Now these precision laser cut brackets are designed to bolt cleanly to your truck's existing mounting points without welding or drilling your frame. The hardware is included to get these installed into place.

And I have to say, as a side note, I'm very impressed with the overall quality of this kit. I have dealt with other airbag systems before, and while they are fine in their own right, Pacbrake really has a premium item here with the material that the bags are constructed from and the brackets and the finish on these brackets as well. Everything to me just screams of premium quality and this is really going to be a great kit to consider, especially if you're looking for a kit that's made out of premium materials and have a premium finish on top of that. So this kit is designed to work with your setup today, and wherever your upgrades take you tomorrow. Again, you're gonna be able to inflate these manually with standard air valves right out of the box. No extra parts are needed. But if you already have an onboard compressor, that's great. These are gonna connect easily to most existing setups. If you're planning for an in-cab wireless controller down the road, that's not gonna be a problem either because the foundation is already built in with this kit, making it very easy to expand your control options when you're ready. So again, the load support is gonna be up to 5,000 pounds of additional leveling support, but I do wanna let you know that air springs do not actually increase your truck's weight carrying capacity, so you wanna make sure that you're not exceeding your manufacturer's recommended weight limit. So again, you are going to receive everything that you see here on my table before me. Everything you need to get this installed along with instructions to guide you through that installation process. If you do pick this kit up, that's great. We'd love to hear back from you regarding your experience with getting this installed and using it. So you can share your experience with us and more by dropping a comment or leaving a review on this product page. And if you have any additional questions, don't hesitate to give us a call. We'd love to help you out. Well, that's gonna wrap up our look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.

Ratings & Reviews

4.7

24 reviews
5,000-lb Capacity. When the load gets heavy, your truck shouldn't feel like it's fighting you. These air bags help you stay level and in control so you can tow with confidence and handle heavy loads without second-guessing your suspension.

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Don’t fit, worked on it for hours with no luck.



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They need instructions to be more clear but fit very nicely i would recommend pacebrake



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Going camping!!!



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Worked out great



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Thank you Joshua for your assistance.



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Easy install and done exactly what I needed it to do



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Excellent choice… Very high-quality… Took 4 to 5 hours to install… Which included new shocks getting all the tools together and clean up… Very happy thank you



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Installed this past weekend. Haven't towed with it yet. Nice construction and finish. I have a 2025 Chevrolet Trail Boss 2500HD and the spacers are NOT needed. Measurement for needing the spacers in 7" and above between jounce cup and contact pad. My space was 5.5" to 6".



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Awesome product easy to install and I really appreciate etrailer service



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It was very easy install . The ride has improved a lot while towing my 41 ft. toy hauler , Thanks !!



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Direct bolt on, plug and play



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The product is a great product. After installation was completed and the air added to the air suspension, it raised the rear end of the van about 2-3 inches.A very nice improvement.
Installation instructions definitely need better quality diagrams.



by:

Easy to install and work just as I had expected. Great finish on brackets and quality hardware. Easy to follow instructions. Highly recommend these airbags!



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The 2" spacers are definitely not needed for a Trail Boss. I could barely get them in, and now the ride is super stiff. Now I have to get back under the truck and remove the spacers. Not looking forward to that. It was very difficult installation, for no reason.



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Very well built brackets, installation was as explained in the instruction. Happy Camper!


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24

See what our Experts say about this Pacbrake Vehicle Suspension


Info for this part was:

Employee Dustin K
Video Edited:
Dustin K
Employee Daron K
Edited by:
Daron K
Employee Andy C
Installed by:
Andy C
Employee Dawn Z
Written by:
Dawn Z

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