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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
2012 Tiffin Allegro Bus Motorhome
Pacbrake

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

Part Number: PB55ZV
In Stock
$552.06
Retail:$613.39
You Save: $61.33
Vehicle Suspension
Not Confirmed to Fit

2012 Tiffin Allegro Bus Motorhome

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When the load gets heavy, your truck shouldn't feel like it's fighting you. These air bags help you stay level, drive steady, and stay 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 - Double Convoluted - Rear Axle - 5,000 lbs part number PB55ZV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Pacbrake Vehicle Suspension - PB55ZV

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

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


Highlights

  • Custom Fit for 2010-2020 Dodge RAM 4500/5500 Cab & Chassis: 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 Required: 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

Support That Steps Up When Your Suspension Bows Out

When you're hauling equipment, towing a trailer, or making deliveries with a loaded flatbed, factory leaf springs can only do so much. Alpha HD air springs add up to 5,000 lbs of rear axle support, giving your Dodge RAM 4500/5500 Cab & Chassis the muscle it needs to stay level, controlled, and capable even when you're maxed out and running long hours. With your rear end held up properly, braking stays sharp, steering remains predictable, and your headlights aim where they're supposed to—not into the trees. Whether you're pulling equipment out of the yard at dawn or rolling home after dark, these air bags help your truck carry the load with confidence.

Adjusts to Match Every Job

No two jobs are the same and neither is every load. Alpha HD air springs let you dial in the pressure from 5 to 100 psi depending on what your truck's carrying. Fill them up when the trailer's loaded or the service body is packed to the rails. Let some air out when you're driving light or empty. Manual inflation makes adjustments fast and straightforward, so your suspension always matches the weight on board. It means a smoother ride for the crew, more control behind the wheel, and less wear and tear on your truck no matter what the day throws your way.

Built Tough for Worksite Abuse

Commercial trucks don't get pampered. They run in the cold, the mud, the salt, and the heat, sometimes all in one week. That's why Alpha HD air springs are built with one-inch thick, corrosion-resistant end caps, reinforced with 20 internal support wires, and protected by heavy-duty roll plates to handle real-world loads. Powder-coated steel brackets stand up to rust and grime, so you can keep moving through the worst conditions without worrying about what's happening under the frame. This is hardware built to take abuse, not sit pretty.

Installs Without Taking the Truck Off the Clock

Getting more load support shouldn't mean taking your truck out of service for days. This system installs with laser-cut brackets and heavy-duty hardware built to match the demands of your RAM Cab & Chassis frame. No drilling is required, just smart, jobsite-ready components that go on cleanly with basic shop tools. Manual inflation valves mount through license plate holes or any location that fits your build. With everything in the box—from precision brackets to high-quality fittings—you can get the job done and get back on the road without wasting time.

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:

Application:

  • 2010-2020 Dodge RAM 4500/5500 Cab & Chassis - 2WD/4WD

Air Suspension:

  • Load support: up to 5,000 lbs of additional leveling support
  • Spring type: Double Convoluted
  • 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

Warranty:

  • Limited lifetime on air bags
  • 2-Year or 24,000 miles on 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


HP10321 Pacbrake Alpha HD Rear Air Suspension - 5,000 lbs - Manual Inflation Valves

Installation Details PB55ZV Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Video of Pacbrake Alpha HD Air Bag Suspension Kit - Double Convoluted - 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 Bag Kit - PB55ZV

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 work with your 2010 to 2020 Dodge RAM 4500 and 5500 cab and chassis. Now on custom fit parts such as this kit, it is recommended that you use our vehicle fit guide here at etrailer.com. Simply enter the year make and model of your vehicle, and if it asks you any other additional questions, answer those and our fit guide will confirm if this kit will work for you or if we have something comparable that will work for you.

Now, when you're hauling equipment, towing a trailer or making deliveries with a loaded flatbed, factory leaf springs can only do so much. These air springs are going to add up to 5,000 pounds of rear axle support, giving your Dodge Ram 4500 or 5500 cab and chassis the muscle that it needs to stay level, controlled, and capable, even when you're maxed out and running long hours. With your rear end held up properly, brakings are gonna stay sharp. Steering is going to remain predictable, and your headlight aim is, your headlights are gonna aim where they're supposed to, not into the trees or up to the sky. So whether you're pulling equipment out of the yard at dawn or rolling home after dark, these airbags are gonna help your truck carry the load with confidence.

Now, as you well know, no two jobs are gonna be the same and neither is every load. That's why these air springs are gonna let you dial in the pressure from five to 100 PSI, depending on your, on what your truck's carrying. So you can fill them up when the trailer's loaded or the service body is packed to the rails and you can let some air out when you're driving as light or empty. These manual inflation valves are gonna make adjustments fast and straightforward, so your suspension's always gonna match the weight on board. What that means for you is a smoother ride for you, for the crew, and more control behind the wheel and less wear and tear on your truck no matter what the day throws your way.

But commercial trucks don't get pampered. They run in the cold, the mud, the salt, and the heat, sometimes all in on week. That's why these air springs are built with 1" thick corrosion resistant end caps. The bags themselves are reinforced with 20 internal support wires and they're protected by these heavy duty roll plates. They handle real world loads.

These also feature these really great powder coated steel brackets that are gonna stand up to rust and grime. So you're gonna be able to keep moving through the worst conditions without worrying about what's happening under the frame. And then this also is going to include all of the hardware that you need to get these secured and mounted into place. Now, I don't have all the hardware laid out here on my table. I just have the bags put together loosely with the brackets and the roll plates. So I thought it'd be better for you just to see a photo of all the hardware that's gonna be included with this kit. So you're basically gonna get everything that you need minus the tools to get this installed into place. Now, these precision laser cut brackets are designed to bolt cleanly to your truck's existing mounting points without welding or drilling to your frame. And what's great about this kit is that it's designed to work with your setup right now and wherever your upgrades may take you down the road. So again, you're gonna be able to inflate manually with the standard air valves right outta the box, no extra parts needed, but maybe you already have an onboard compressor. If so, that's great, because these are gonna connect easily to most existing setups. And then maybe you're planning for something like an in cab wireless controller down the road. That's not gonna be a problem either, because the foundation is already being laid for those future upgrades. So you're gonna be able to easily expand your options when the time comes. Now, as I mentioned, these are gonna give you up to 5,000 pounds of additional load leveling support, but be aware of the fact that these bags don't actually increase your truck's weight carrying capacity. So you do wanna make sure that you're not exceeding your manufacturer's recommended weight limit. If you do pick this kit up, we want to hear back from you regarding your experiences with getting this installed and using it. So you can share your experiences with us by dropping a comment or leaving a review on this product page. And if you happen to have any other additional questions, don't hesitate to reach back out to us. We do wanna make sure that you're getting exactly what you want and need. Well, that's gonna wrap up our quick look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.

Ratings & Reviews

4.8

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

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



by:

Going camping!!!



by:

Worked out great



by:

Thank you Joshua for your assistance.



by:

Easy install and done exactly what I needed it to do



by:

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



by:

Awesome product easy to install and I really appreciate etrailer service



by:

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".



by:

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



by:

Direct bolt on, plug and play



by:

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!



by:

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.



by:

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


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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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