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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
2000 Kia Spectra
Special Savings on Select Pacbrake Alpha Air Spring Kits.
Pacbrake

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

Part Number: PB56SV
In Stock
$501.51
Vehicle Suspension
Not Confirmed to Fit

2000 Kia Spectra

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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 PB56SV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Pacbrake Vehicle Suspension - PB56SV

  • 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 - includes 2" spacer to maintain stance.
  • 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 hrs
  • DIY: 3 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
  • Pacbrake 2" spacer
  • Grade 5 plated hardware
  • Air lines, push-to-connect fittings, inflation valves, installation instructions


HP10152 Packbrake Alpha HD Air Suspension Spacer for Single & Double Convoluted Spring Kits - 2"

HP10585 Pacbrake Alpha HD Air Bag Suspension Kit - Rear Axle - 5,000 lbs

Installation Details PB56SV Installation instructionsAlternate Instructions PB56SV Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Ratings & Reviews

4.7

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



by:

Awesome product easy to install and I really appreciate etrailer service


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46
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See what our Experts say about this Pacbrake Vehicle Suspension

  • Suspension Enhancement Kit Recommendation for 2025 Chevy Silverado 3500 Trail Boss
    Hey John, I do have a suspension enhancement kit that fits your 2025 Chevy Silverado 3500 with the PacBrake kit part # PB56SV but the Timbren kit and everything else we have that is listed for your truck does not fit the Trail Boss models. Would you be okay with an air bag kit?
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  • Availability of RoadActive Suspension Kit for 2025 Silverado 2500 Trail Boss
    Hey Wayne! I'm sorry to say that none of the RoadActive Suspension kits will fit the Trail Boss model. The same is true for almost every other suspension enhancement option. If you want extra support you can use the Pacbrake Alpha HD Air Bag Suspension Kit # PB56SV or # PB36SV (with jounce bumpers). These air bags are specifically designed to be compatible with the Trail Boss. I would choose the air bags with the jounce bumpers. This gives you extra support and protection from bottoming...
    view full answer...
  • Difference Between Pacbrake Air Bag Kits for a 2025 Chevy Silverado 2500 Trail Boss
    Hey Ken! The Pacbrake Alpha HD Pro Air Bag # PB36SV you're looking at has internal jounce bumpers while the Kit # PB56SV you're comparing it to doesn't. Internal jounce bumpers help to ensure your Trail Boss won't bottom out (metal on metal) if there ever is a time that the air bags fail. I know it seems like Pacbrake isn't as confident in their air bags if they have this feature built-in, but it's more like an insurance policy than anything. What's the main purpose of using the air...
    view full answer...
  • Can I Install the Pacbrake Alpha HD Air Bag Suspension Kit PB56SV On My Own?
    Seeing as how you'd be installing the Pacbrake Alpha HD Air Bag Suspension Kit item # PB56SV on a newer 2024 - 2026 Sierra or Silverado 2500/3500, I strongly recommend taking it somewhere if you're inexperienced. We do have a network of installers that can help you though. If you go to the product page of the Pacbrake item # PB56SV you referenced and scroll down below the pics on the left side you'll see a box that says, SCHEDULE AN INSTALLATION. Go ahead and click on it and it will take...
    view full answer...
  • Air Bags for 2025 GMC 2500 AT4
    Hey Charles! What kind of 5th wheel do you have? For your 2025 GMC 2500 AT4 I recommend the Pacbrake Alpha HD Air Bag Suspension Kit # PB56SV. These are high quality air bags (like Firestone) and this particular kit comes with the 2" spacer for AT4 models. The 5,000 lb load leveling capacity should be more than enough for your 5th wheel and they also feature a limited lifetime warranty. I also recommend adding an air compressor like the Pacbrake Single Channel Wireless Air Spring Controls...
    view full answer...
  • Will Pacbrake Alpha HD Fit 2025 GMC Sierra 2500 With B&W Turnoverball
    Hey Reed! Yes, the Pacbrake Alpha HD Air Bag Suspension Kit # PB56SV will fit your 2025 Sierra 2500 with the Turnoverball. The only 5th wheel/gooseneck exception for fitment with this kit is if you have a Curt 5th wheel so that doesn't impact you. I also highly recommend adding an air compressor like the Pacbrake Single Channel Wireless Air Spring Controls w/ Compressor and Remote # PB89MV. This will allow you to control the pressure in the air bags no matter where you go from the cab...
    view full answer...
  • Air Bags for 2026 Chevy Silverado 3500 Trail Boss
    Hey Josh, congratulations on the new truck! I would recommend Firestone but unfortunately, they aren't a fit for Trail Boss models. The next best thing is going to be the Pacbrake Alpha HD Air Bag Suspension Kit # PB56SV. This kit is specifically designed to fit your 2026 Silverado 3500 Trail Boss. Do you want an air compressor as well? The Air Lift WirelessONE Compressor System for Air Helper Springs # AL25980 will work with this setup. This is a single path system so the air pressure...
    view full answer...

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Info for this part was:

Employee Dustin K
Video Edited:
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