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  1. Vehicle Suspension
  2. Pacbrake
  3. Air Springs
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Heavy Duty
THIS ITEM IS NOT A FIT FOR
2011 GMC Acadia
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Pacbrake

Pacbrake Alpha HD Pro Air Bag Suspension Kit w/ Internal Jounces - Rear Axle - 5,000 lbs

Part Number: PB28SV
In Stock
$606.88
Retail:$674.32
You Save: $67.44
Vehicle Suspension
Not Confirmed to Fit

2011 GMC Acadia

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etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
Heavy trailer, camper, or bed loads can leave your truck squatting and less controlled. These air springs add up to 5,000 lbs of leveling support to reduce sag, sway, and bottoming, while internal jounces let you run 0 psi unloaded. Great Prices for the best vehicle suspension from Pacbrake. Pacbrake Alpha HD Pro Air Bag Suspension Kit w/ Internal Jounces - Rear Axle - 5,000 lbs part number PB28SV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (11)
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  • Videos (1)
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Pacbrake Vehicle Suspension - PB28SV

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

Heavy trailer, camper, or bed loads can leave your truck squatting and less controlled. These air springs add up to 5,000 lbs of leveling support to reduce sag, sway, and bottoming, while internal jounces let you run 0 psi unloaded.


Highlights

  • Custom Fit for Your Truck: Vehicle-specific brackets and hardware position the air springs for your truck's rear suspension.
  • Level Heavy Rear Loads: Up to 5,000 lbs of supplemental support helps reduce rear sag with substantial trailer, camper, or bed weight.
  • Match Support to the Load: Adjust air pressure to suit changing towing and hauling loads instead of running one fixed level of support.
  • Run at 0 psi Unloaded: Internal jounce bumpers let you bleed the air springs down to 0 psi once the extra load comes off.
  • Built for Life Under Your Truck: Stainless steel hardware and braided air lines add corrosion resistance where the system faces road spray and weather.
  • Upgrade Your Air Control: Add a compatible onboard compressor or control system for more convenient pressure changes.

Features to know about

Level the Rear Under Heavy Loads

When trailer weight, a slide-in camper, or a heavy bed load settles your truck onto its rear suspension, squat and extra body movement can make the truck feel less controlled. The two adjustable rear air springs add supplemental support to help reduce sag, sway, and bottoming while letting you tune the suspension to the weight you're carrying. With up to 5,000 lbs of load-leveling capacity, you can add only the pressure the load calls for instead of treating maximum pressure as the default. Your truck can sit closer to level and remain more controlled while carrying or towing substantial weight.

Add Support, Then Drop to 0 psi

A truck that tows one day and runs empty the next doesn't need the same rear-suspension support all the time. Internal jounce bumpers let you add air when your trailer, camper, or cargo is aboard, then reduce the air springs to 0 psi once that load comes off. Those internal jounces also protect the air springs against bottoming when suspension travel is used up. You get the support your truck needs under weight without having to keep air in the bags simply to protect them when you're driving empty.

Corrosion Resistance Where Exposure Hits Hardest

Suspension hardware lives where road spray, dirt, and weather reach it, so material choices matter underneath your truck. This kit uses braided stainless steel air lines along with stainless steel fittings, Schrader valves, roll plates, and mounting hardware to add corrosion resistance throughout key parts of the system. That extra durability is focused where it matters, helping the hardware you rely on for load support and pressure adjustment stand up to the environment beneath a working truck.

Custom Installation

You'll start by measuring your truck's stock ride height, then remove the factory jounce bumpers to make room for the air spring assemblies and vehicle-specific brackets. Once the springs are mounted, route the braided stainless steel air lines away from brake lines, fuel lines, wiring, and other potential trouble spots, leaving enough slack for suspension movement before mounting the Schrader valves where they're easy to reach. Adding air bags is a job experienced DIYers can handle, but if you would rather leave it to a professional, we can help you find an installer near you.

Upgrade Your Air Control

The included Schrader valves give you everything you need to adjust the air springs manually, but pulling out an external compressor can get old if your towing or hauling setup changes frequently. You can add a Pacbrake Bravo Wireless Air Control Kit (sold separately) to adjust pressure from your phone, check live pressure, and save presets for loads you come back to regularly. Also, you'll be able to choose between filling both air springs together or controlling them independently when the load isn't even side to side. It's an optional upgrade, but one that makes the adjustable part of an air-spring system much easier to use regularly. And it's not the only solution available. There are a variety of compressor options from Pacbrake that might be the perfect fit for your setup.

Specs

Load-leveling capacity:

  • Up to 5,000 lbs
  • Does not increase your vehicle's weight-carrying capacity or GVWR

Suspension configuration:

  • Quantity: 2 air springs
  • Suspension position: rear
  • Internal jounce bumpers

Air system:

  • Maximum air pressure: 100 psi
  • Unloaded air pressure: 0 psi permitted
  • Braided stainless steel air line length: 6'

Construction:

  • Stainless steel air spring fittings
  • Stainless steel mounting hardware
  • Stainless steel Schrader valves
  • Stainless steel roll plates
  • Braided stainless steel air lines

Estimated install time:

  • Professional install: 2 hours
  • DIY install: about 3 hours, depending on tools and experience
  • Plan for extra time for a first air spring install or when working in a driveway setup

Warranty:

  • Air bags: limited lifetime
  • Mounting brackets, fasteners, and spacers: 2 years or 24,000 miles


HP10002-J-S Pac Brake Alpha HD Pro Air Springs - Internal Jounces - Stainless Steel - Rear - 5K

Installation Details PB28SV Installation instructionsAlternate Instructions PB28SV Installation instructions

This Product Fits The Following Vehicles




Video of Pacbrake Alpha HD Pro Air Bag Suspension Kit w/ Internal Jounces - Rear Axle - 5,000 lbs
Video Thumbnail Video Player Dialog

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 Pro Rear Axle Air Bag Kit Jounce Stainless - PB28SV

Hi, everybody, Andy here with etrailer. Let's take a quick look together at this Pacbrake Alpha HD Pro rear axle airbag suspension kit with internal jounce bumpers and stainless steel hardware. Now, on your screen, I am putting the fitments there for you. This is going to work with various years of the Ram 3500, 2500, and 1500. So on your screen, I do have that list there. Now, it is important that you go through our vehicle fit guide here at etrailer.

Just input the year, make, and model of your vehicle and answer any other questions that it might have for you, and our fit guide will confirm if this kit will work for you or if we have something comparable that will work for you. But as you know, when the load gets heavy, your truck is going to need more than just those factory-reared suspension springs hanging on for dear life. These airbags are going to give you up to 5,000 pounds of rear axle support, keeping your truck level and steady even when your trailer is loaded or your bed is packed and the miles are long. So what that means for you is no more rear end sagging, throwing off your braking and steering or your headlights pointing up into the sky. Now, bottoming out doesn't just feel rough.

It can actually wreck your airbags. That's why this system includes internal jounce bumpers. Those bumpers are inside each bag, as you can see there from that example of a cutaway of one of their airbags from Pacbrake. So even with no air pressure, your suspension has a built-in safety net. You're going to be able to safely run at zero PSI when unloaded, which means no harsh rebound, just that smooth factory-style ride.

Now, as you can see here, this kit does include stainless steel braided airlines. They're going to be more durable and resistant to wear compared to the standard rubber lines. You're also going to get these stainless steel roll plates, which help protect the airbags along with schrader valves. So you're going to be able to easily inflate or adjust the air pressure using a standard air source. Now, on your screen, I'm including a photo there.

You're going to get two sets of hardware. The top photo is going to be the standard hardware that typically comes with these bags. But the bottom picture is the upgrade. It's the stainless steel upgrade that you're going to be receiving with this as well. So I just wanted to give you an idea of what to expect, but that stainless steel hardware, like I said, it's a big upgrade because it's built to last in those harsh conditions. Stainless steel does a great job of resisting rust and corrosion much better than standard materials. It's also stronger and less prone to damage, so you're going to be less likely to deal with leaks or wear over time. But as you know, every haul is different. That's why these air springs give you full control over your ride height and firmness with adjustable pressure from five to 100 PSI. So if you're hauling a fifth wheel or a full bed of gravel, you'll just crank up the pressure. And then when you're unloaded and heading home at the end of the day, just drop it back down for a softer ride. So with the manual inflation valves included, tuning your suspension is going to be very easy, very straightforward. Now, Pacbrake is one of my favorite air spring kits that we carry here just because the bags are premium, the materials are premium, the bags have a one-inch thick, a corrosion-resistant end caps. They're also reinforced with 20 internal support wires, giving you that maximum strength under the load. And then these also feature these precision laser-cut powder-coated brackets. Again, they're designed to bolt cleanly to your truck's existing mounting points without welding or drilling to your frame. So again, this is gonna give you up to 5,000 pounds of load leveling support, but just be aware that airbags do not actually increase your truck's weight carrying capacity, so you want to make sure that you're not exceeding your manufacturer's recommended weight limits. One final note, if you get these and you want help with installation, on this product page, we have a link underneath the photo section that you can click. That's gonna take you to our installer locator. Answer some of the questions that it has there for you, and that locator will find an installer that e-trailer has partnered with in your area to do the installation for you. But if you happen to have any other additional questions, don't hesitate to reach out. We want to make sure that you're getting exactly what you need. Well, again, my name's Andy. Thank you for joining me.

Ratings & Reviews

4.2

11 reviews
Review sort icon
Heavy trailer, camper, or bed loads can leave your truck squatting and less controlled. These air springs add up to 5,000 lbs of leveling support to reduce sag, sway, and bottoming, while internal jounces let you run 0 psi unloaded.

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Did not fit my truck 2026 Silverado 1500 4x4, website said it would fit, it does not fit, as axle plate is Square on my truck, this kit have round axle plate that interferes with spring shackle bolts, would not fit or even be centered. SO I am returning them, this needs to be corrected on your website, it does not fit the 2026 Silverado 1500 2x2 or 4x4!



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Great product!



by:

Parts fit perfectly, directions were very easy to understand.



by:

It was easy to order and the stuff I ordered is just what I was looking for. The people who helped me was great



by:

Great set up. Easy to install. Much better than the Timbren bump stops.



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I have no problems with the quality or the install. My one problem is the instructions, when you order the stainless steel kit, it comes with a separate box to replace the hardware. That's totally fine, but it would be nice if they could work that in the instructions for when to install the stainless steel airlines because you can install them at the same time that you can the push in plastic lines. Besides that, these are an insane set of airbags. When I ride at zero psi cuz I got the ones with the internal jounce bumpers, I did not expect this but it smooths out my ride. That's a super huge plus.



by:

The only reason I bought this kit is because I was told I could put zero psi when not towing and I would not lose the factory suspension comfort. That information was wrong its a horrible ride now and I regret getting these bags. Was also told that they don't off this kit without the stainless upgrade so I had to buy it, but when it shipped there was a separate box with the stainless kit and they regular stuff was in the same box as the bags feels like I got ripped off on this deal



by:

This is a very nice kit. I installed on my new 2026 Silverado 2500hd. Installation was pretty straight forward, but still took a bit of thinking. After everything is mounted correctly there is a slight lean to the bags (not completely perpenticular to the mounting plates). I called Pacbrake support and they assured me this was normal and nothing to be concerned with. I had the equivalent AirLift kit on my 2007 Silverado 2500hd and I think I like the Pacbrake kit better. Everything seems a bet "beefier".



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Info for this part was:

Employee Amanda M
Edited by:
Amanda M
Employee Katherine B
Written by:
Katherine B
Employee Alex H
Updated by:
Alex H
Employee Andy C
Installed by:
Andy C

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