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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
1989 Dodge Shadow
Pacbrake

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

Part Number: PB37RV
In Stock
$544.83
Retail:$605.36
You Save: $60.53
Vehicle Suspension
Not Confirmed to Fit

1989 Dodge Shadow

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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 PB37RV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (26)
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  • Videos (2)
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Pacbrake Vehicle Suspension - PB37RV

  • Air Springs
  • Towing/Load Leveling
  • Pacbrake
  • Rear Axle Suspension Enhancement
  • Heavy Duty
  • 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: 1-1/2 hrs
  • DIY: 2-1/2 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


HP10370 Pacbrake Alpha HD Rear Air Suspension - 5,000 lbs - Manual Inflation Valves

Installation Details PB37RV 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 Bag Kit - PB37RV

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 for your 2015 and newer Ford E-Series Cutaway E-450, and then your 2008 to 2014 Ford Van E-450. And these are for the Class C motorhomes. 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 will work for you or if we have something comparable that will work for you.

Now, on my table, I just have the bags here, kind of loosely assembled with the brackets, but this does come with a complete hardware kit. And so, on your screen, I'm showing you all the hardware that's going to be included with this. I just didn't want to pile it up here on my table. I thought this photo would give you a clear review of what you're gonna be getting. So the idea here is, you're gonna have basically everything that you need to install this into place.

But as you know, class C motorhomes do tend to ride heavy, especially when you're loaded up with water and gear and passengers, basically having all the comforts of home. And those factory leaf springs are gonna often sag under all that weight. And what that's going to do is lead to poor handling, rear end squat and excessive sway on uneven roads. These springs are gonna add up to 5,000 pounds of rear axle support, helping you to stay level and composed no matter how much weight you're carrying. So that's gonna mean more control in crosswinds, better braking on descents, and a flatter, more confident ride through the curves.

But as you know, not every trip loads the same. Sometimes you're gonna have full water tanks and passengers aboard. Other times, you might be traveling light. So these air springs are gonna let you adjust your ride to match the moment. And with air pressure from five to 100 PSI, you're just gonna add air when you need extra firmness and support and then let out air for a smoother ride when you're empty.

The manual inflation valves here are gonna make it very easy to tune your suspension at the campsite or on the road. No onboard system is required. It's gonna be a very simple way to control your motorhome's handling, comfort, and stability. Also, class C motorhomes do rack up serious mileage and they see it all, rough roads, weather swings, back to back driving days. That's why these springs are really, they're overbuilt for long term use. These airbags are reinforced with 20 internal wires for strength and stability. You can't see them, but on each end, there's one-inch thick end caps and they're gonna help resist corrosion and daily wear. And then, we have these heavy duty roll plates on either end and then these powder-coated steel brackets, and all this is going to do a great job of fighting off rust, corrosion, basically protecting your investment over the long haul. So whether you're going after the warm weather or heading into the mountains, this system is gonna be built to handle all of it. These precision, laser-cut, custom-fit brackets are designed to bolt cleanly to your classy motorhome's existing mounting points without welding or drilling to your frame. And this kit is designed to work with your setup right now and wherever your upgrades may take you down the road. Again, you're gonna be able to inflate manually with the standard air valves right out of the box. No extra parts needed. But if you already have an onboard compressor, this is going to connect easily to most existing setups. But then, maybe you're planning for an in-cab wireless controller down the road. That's not gonna be a problem because with this system, you are laying the foundation for upgrades later on. As I mentioned, this is going to have a load support of up to 5,000 pounds. But do be aware of the fact that this is not going to actually increase your motorhome's weight carrying capacity. So you wanna make sure that you're not exceeding the manufacturer's recommended weight limit. If you do pick this kit up, we would love to hear back from you regarding your experience with getting these installed and using them, and you can share your experience with us by dropping a comment or leaving a review on this product page. And if you have any other additional questions, don't hesitate to give us a call. We wanna make sure that you're getting exactly what you need. Well, I think 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

4.7

26 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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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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