To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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.
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.
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.
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.
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.
This kit is designed to work with your setup today and grow with your upgrades tomorrow. You can inflate manually through the included 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.
Want to step up to an all-in-one kit with air bags, compressor, and wireless controller in one package? We've got you covered with Pacbrake's On Demand Kit (PB66YV).
Looking for a complete system with onboard air storage too? Upgrade to one of the "Ultimate" Kits (PB57SV) or (PB37SV) with air bags, compressor, wireless controller, and a 1/2-gallon or 2-1/2-gallon tank for added versatility.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
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 fit your 2020 and newer Chevrolet Silverado and GMC Sierra 2500s and 3500s, either with the two or four wheel drive models. And take a look at the other information I have listed there for you on the graphic. The AT4 and trail boss models should use the kit number that you see there on your screen.
That kit does come with the required two inch spacers, and then this is gonna be for all trucks, including those with the OEM fifth wheel prep packages. This will not fit cabin chassis models and this will not fit vehicles with aftermarket CURT fifth wheel packages. So all that to say on custom fit parts such as this kit, I do recommend taking advantage of our vehicle fit guide here at etrailer.com, input to your 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, heavy trailers, full beds of gear piled high, that all changes how your truck handles. So as you probably know, without the right support, you're gonna feel that immediately sagging in the rear, poor handling, and a ride that's gonna get unpredictable very fast.
This airbag system is going to put you back in control with up to 5,000 pounds of load leveling support. This is gonna help reduce squat, improve steering response, and keep your truck stable when the weight stacks up. But as you know, every haul is different. That's why these springs will give you full control over the ride height and firmness with adjustable air pressure from five to 100 PSI. So if you're hauling a fifth wheel or a full bed of gravel, you can just crank that pressure up and then when you're unloaded and heading home, you can drop that pressure back down for a softer ride.
With the manual inflation valves included, tuning your suspension for the day's work is gonna be pretty easy. Now these springs are reinforced all the way through with heavy duty end caps, which you can't see right now, because I do have these kind of loosely assembled. But you do have these heavy duty roll plates. They're gonna protect the bags. The bags also have 20 internal support wires that are going to add to their durability and their strength.
And then we have these powder-coated steel brackets, and then the hardware, which is included. I don't have it all laid out here on my table, but I do have a picture here showing you everything that you're gonna get. So with the brackets, the bags, the hardware, everything is designed to put up with virtually anything you throw at it. Whether it's rough weather or rough roads, this system is going to a great job of giving you that support that you're looking for no matter what conditions you find yourself in. The precision laser cut brackets are custom fit. They are designed to bolt cleanly to your truck's existing mounting points. And this kit is designed to work with your setup right now as it stands 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 are needed, but maybe you already have an onboard compressor. If so, that's great. This is gonna connect easily to most existing setups. And then if you're planning for something in the future, like maybe an in-cab wireless controller, that's not gonna be an issue either, because what you're doing with this kit is you're basically laying the foundation for future upgrades. So this is gonna be able to grow with you. So again, this is gonna give you up to 5,000 pounds of load leveling support, but be aware of the fact that this does not actually increase your vehicle's weight carrying capacity. So you wanna make sure that you're not exceeding your manufacturer's recommended weight limits. If you do pick this kit up, we want to hear back from you regarding your experience 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 for us, don't hesitate to give us a call, shoot us an email or a chat. We wanna make sure that you're getting exactly what you want and need. I think that's gonna wrap up our look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.
Ratings & Reviews
Overall the installation isn’t bad, couple bolts/nuts difficult to access but doable. Took little over an hour to install both heavy duty bags.
They do roughen the ride on the 2021 RAM 1500 hemi/etorque 4x4 with coil springs. I’ve brought the air pressure down to 2 lbs and still notice that without weight in bed or trailer attached it still is stiffer.
I would recommend using these Pacbrake heavy duty air bags.
Great kit. Great quality. Easy assembly. Would’ve given 5 stars except for the J-Hooks. Having the end user cut them off creates an opportunity for someone to mess up. They could easily be made the correct length without causing install issues.
Easy instal and has worked perfectly.
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.
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!
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.
Looks great. Thanks
Very well built brackets, installation was as explained in the instruction. Happy Camper!
Love the product
The directions could’ve been a little more detailed
Put about 1800 miles on these last weekend. Was picking up a car that's heavier than my normal race car on the ramp truck, so I wanted to give the truck a bit of help. Good news, it worked well. Truck rode beautifully, loaded or unloaded.
The instructions could be a bit more clear, in regards to the clinch stud. I had that on backwards at first because of how things appeared in the picture. Also, I know most things are DIY but installation was about 80% assembly, 20% actual install. If these came already assembled, it would have saved a lot of time!
Simple to install, did it without pulling the tires and wheels I seen no need for that, It took me a total of 3 hrs. to install in my driveway.
What a difference the air bags make when towing a camper. Installation was easy, instructions were well written.
Good quality product. For my 2018 1500 Silverado it was a little difficult to get the U bolt over the frame but under the hard lines running on top of the frame in that area.
Aluminum ends, brackets, and even packaging was all exceptional and part of the reason I choose these. Haven't trailered anything yet but upon initial install no noticeable difference ride difference running 10 psi on a F250.
Worked well when pulling trailer. Kept vehicle and trailer level. Without trailer seems to creak and groan more than I thought it would.
Both of the fitting leak where they swivel. Had to take everything back off. Not my first time installing bags but First time with this brand and will be the last. Etrailer won’t make it right and having me go though pacbrake. Waiting on email to get process started. They Don’t seem to be in any hurry. Will try and source fitting local so I can get this back together. Shane on you etrailer. I ordered from you and shipping was slow not knowing it was directly coming from manufacturer.
Went in easy enough, better than I thought. Ride without trailer attached is good. Have not hooked up trailer yet
Easy to install with the rear tires off, did one side at the time with a single jack and two jack stands. The towing of our fifth wheel is much better, much less chucking and more directional stable.
I decided on the pack break airbag due to my truck stock height. With a limited amount of room, there is between the axle and the frame they fit perfectly. They almost work with no air in them at all. I figure with a little bit of pressure. It’ll hold all the weight and still ride well I had them on the truck completely functional in an hour and a half, and that’s even with one bag, assembled incorrectly and reassembled correctly and installed so even with that little mistake it was still an hour and a half installed with the wheels off highly recommend this kit looks good. Seems to work well and fits in the tight space stock truck Cuz.
I like these bags. This is my 3rd set of air bags but my 1st set of PACBRAKE I have owned and they are the best. Metal where others are plastic. Powder coated instead of paint that rusts off. nice hardware instead of crummy allan bolts that can't easily be removed. The bracing is much better too. They are by far higher quality than the firestone. Installation is about the same but they use stainless air fittings instead of plastic like the other guys. The ends of the PACBRAKE are machined aluminum. My Airlifts brand were plastic with inserts that broke out.(see pic) I havent had the chance to use the new PACBRAKE under tough conditions but the hardware and Materials they are made of are superior to the other brands.
nick was very helpful everything was as expected
I put them to use today and was very happy with the ride and stability while towing my camper.
These fit absolutely perfect. Easy install help keep my truck level when connected to my fifth wheel.
The air bags were very simple to install but the u bolts for my gooseneck mount interfered with the air bag mounting
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