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  1. Vehicle Suspension
  2. Pacbrake
  3. Air Springs
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Heavy Duty
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2012 Infiniti M35
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Pacbrake

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

Part Number: PB84QV
In Stock
$639.87
Retail:$710.96
You Save: $71.09
Vehicle Suspension
Not Confirmed to Fit

2012 Infiniti M35

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etrailer Installation
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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 PB84QV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Pacbrake Vehicle Suspension - PB84QV

  • 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

pacbrake alpha hd pro typical installation

Typical Alpha HD Pro installation shown. Vehicle-specific brackets vary by application.


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 and checking tire-to-frame clearance before raising the rear, removing the wheels, and taking out the factory jounce bumpers. The air spring assemblies mount between the frame and axle using the existing jounce-bumper mounting locations up top and axle straps below, with careful alignment and brake-line clearance checked before everything is torqued down. You'll also install the included passenger-side exhaust heat shield, then route the braided stainless steel air lines with enough clearance and 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: 3 hours
  • DIY install: about 4 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


HP10089-J-S Pac Brake Alpha HD Pro Air Springs - Internal Jounces - Stainless Steel - Rear - 5K

Installation Details PB84QV Installation instructionsAlternate Instructions PB84QV 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
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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 - PB84QV

Hi, everybody, Andy here with etrailer. Let's take a quick look together at this Pacbrake Alpha HD Pro rear axle single convoluted airbag suspension kit with internal jounce bumpers and stainless steel hardware. Now this kit has been designed to fit your 2003 to 2013 Ram 2500 two-wheel drive, and then your 2003 to 2018 3500 with the two-wheel drive, then your 2006, 2008 1500. Now on custom fit parts such as this kit, I do recommend taking advantage of our vehicle fit guide here at etrailer. Just pop in 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 will work for you, or if we have something comparable that will work for you.

So as you know, when the load gets heavy, your truck is going to need more than just the rear 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. 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 headlights pointing into the sky. Now, bottoming out just doesn't feel rough.

It can wreck your airbags. That's why this system includes internal jounce bumpers, and I've got a picture of an example of what the jounce bumpers look like inside of these bags. So even when there's 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 this kit includes these stainless steel raided airlines.

So this is an upgraded kit because of the stainless steel airlines and other stainless steel hardware here from the regular kit. So these are going to be more durable and resistant to wear compared to the standard rubber lines. You're also going to get stainless steel roll plates, which help protect the airbags, obviously. Stainless steel shrader valves, so you're going to be able to easily inflate or adjust the air pressure using a standard air source. So the stainless steel components, as I mentioned, are a big upgrade, because they're built to last in those harsh conditions.

Stainless steel is going to resist rust and corrosion, and it's going to be much better than standard materials. Now, on your screen, I just want to show you everything that you're going to be getting. So you're going to be getting this kit with the standard hardware that you see at the top picture, but then you're going to be getting that additional upgraded kit of the stainless steel hardware, and you see that picture there on the bottom. So I didn't have room on my table to lay everything out, so I just wanted to show you what you we inchesre going to be getting. So again, this is going to include that the stainless steel upgrade kit, which is a great benefit. So each haul is 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. If you're hauling a fifth wheel or a full bed of gravel, you can crank the pressure up. If you're unloaded and heading home, you can drop the pressure down for a softer ride. The manual inflation valves are going to allow you to tune your suspension for the day's work, so it's going to be very straightforward to do that. These springs are built with one inch thick corrosion resistant end caps and reinforced with 20 internal support wires for maximum strength under load. These are my favorite airsprings. I just love how Pacbrake has designed everything here. Everything is premium. You even have these powder coated laser cut brackets here that are going to bolt cleanly to your truck's existing mounting points, so no welding or drilling of your frame. So again, this is going to give you up to 5,000 pounds of additional load leveling support, but be aware that these do not actually increase your truck's weight carrying capacity, so you want to be sure that you're not exceeding your manufacturer's recommended weight limit. Instructions are included to guide you through the installation process. One final note, if you are excited to get this kit, you're convinced that it's going to work for you, but you're not really looking forward to the installation. On this product page, underneath the photo section, we have a link that will take you to our installer locator. If you click that link and answer some of the questions that it has for you, that locator will find an installer in your area that e-trailer has partnered with to do the work for you. If you happen to have any other questions, don't hesitate to reach out. We do 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

13 reviews
5 Stars
(9)
4 Stars
(2)
3 Stars
(0)
2 Stars
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1 Star
(2)
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by:
2026 Chevrolet Silverado 2500
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".
by:
2025 Chevrolet Silverado 1500
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:
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:
Components fit great, but the instructions were not very precise and it was a puzzle to assemble correctly.
by:
2021 Ram 2500
Great set up. Easy to install. Much better than the Timbren bump stops.
by:
verry easy install, everthing was in the package. just installed it. will see how it works under load. under an hour install time.
by:
2018 Ram 2500
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:
Parts fit perfectly, directions were very easy to understand.
by:
2019 Chevrolet Silverado 1500
Great product!
by:
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!
Kate F. profile picture
Etrailer Expert

Kate F.

6/25/2026

I am very sorry to hear that these did not work for you John. I see on both the Pacbrake site and our site they are listed to not work with the Adaptive Ride Control, do you have that on your Silverado 1500? I am trying to get to the bottom of this so I can get the information corrected on both sites if needed.

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2005 Dodge Ram Pickup
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See what our Experts say about this Pacbrake Vehicle Suspension


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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