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  1. Air Suspension Compressor Kit
  2. Air Lift
  3. Automatic Leveling
  4. Single Path
  5. No Display
  6. 100 psi
Air Lift SmartAir II Automatic-Leveling Compressor System for Air Helper Springs - Single Sensor

Air Lift SmartAir II Automatic-Leveling Compressor System for Air Helper Springs - Single Sensor

Item # AL25490
Our Price: $506.75
You Save: $320.37
Air Suspension Compressor Kit
This item qualifies for Free Shipping
Shipping Weight: 7 lbs
AL25490 - 100 psi Air Lift Automatic Leveling
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  • Reviews (36)
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Air Lift Air Suspension Compressor Kit - AL25490

  • Automatic Leveling
  • Single Path
  • Air Lift
  • No Display
  • 100 psi

  • Compressor system automatically levels your vehicle using a unique non-contact magnetic height sensor, which allows the system to intelligently determine whether the air springs should be inflated or deflated
  • Automatically detects changes in the vehicle's load and will make adjustments to the air springs as needed
  • Single-path system inflates 2 air springs at the same rate and at the same time
  • Works on any roads, under any load conditions
  • Responsive and accurate to less than 1/16"
  • No air line or wiring needs to be routed into the cab of your vehicle, which eliminates drilling into the firewall
  • No gauges or controller to mess with
  • Kit comes with pre-assembled, weather-resistant wiring harness, height sensor, and 12V compact air compressor with 100 psi
  • Works with Air Lift LoadLifter 5000 Ultimate, LoadLifter 5000, and Ride Control kits
  • 2-Year limited warranty
  • 60-Day money-back guarantee

Note: Can only be installed on vehicles with leaf spring suspension. The sensor installs on the leaf spring or axle.

25490 AirLift Smart Air 2 Automatic Leveling Air Compressor System for Air Helper Springs - Single Sensor

Replaces 25415

Installation Details AL25490 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Air Lift SmartAir II Automatic-Leveling Compressor System for Air Helper Springs - Single Sensor - AL25490

Average Customer Rating:  4.5 out of 5 stars   (36 Customer Reviews)


Installed on a 2018 GMC Serra 2500HD.
is a comprehensive kit, with install basically compromising three component systems.
1) compressor and the bleed down valve. These I installed on a bed bulkhead just above the front of the muffler. Drive line must be removed. see pic.
2) air bags. I think the instructions show the top mount 180 off. Watch the video, and see pics, easy to install.
3) Electrical, I started from the back with the sensor, compressor, drivers side frame rail following the stock wire loom, which i used to tie the air lift loom. Routed into the engine compartment and up to the fuse box where I used a switched misc fuse and the supplied mini blade spade adapter. passed the wire through a hole i drilled into the cowl side of the fuse lid. Lid has fuse diagram, mine was number 36. This is for the 3 amp inline fuse. Pos and Neg wires wired to battery.
4) air lines, I used the Schroeder valve bracket on the receiver hitch, air line driver side of the spare tire zip tied to frame, see pics.
This took me a full nine hours to install, some wasted time trying to decipher the top mount orientation, which seems to be drawn wrong in the instructions. Watch the video online, helps a lot. I do not think that this was overly complicated, just take each system and install them and tie it all together. I had to do some adjusting on the sensor as initial 5 lbs pressure with the sensor setting caused the compressor to turn on and pumped to 11 PSI. I Just lowered the sensor till I had a pump pressure of seven PSI. Love it.

One of the best improvements to our 2018 GMC HD2500. We use a 8.5 Sand S camper, and the air bags and onboard compressor keep the truck at stock ride height, so no night time light to high problem. Compressor comes on with the key on whenever the sensor tells it to level. Havent touched it since it was installed, just the way I like it
Craig N - 08/27/2020


Worked well the first 6 months after I installed it. After that the sensor shorted out and either made the compressor ran constantly or not at all. Contacted etrailer and they helped me get in contact with the manufacturer for a warranty claim. Replacement sensors were on back order with no eta. Air lift contacted me 4 months after my claim and said sensors will no longer be available. They did, however, offer a Wireless One system in its place. If you consider getting this product, don’t! Find another compressor system instead. Otherwise, you’re just wasting your money on something that won’t last and will not be able to get parts for indefinitely. Etrailer should pull this system off their site and not sell it anymore.


I have an air ride fifth wheel hitch has four small bags one on each corner I mounted one airlift bag in the middle and the air compressor to that bag so when the small bags lose pressure due to temperature the compressor takes care of it works awesome


This system works perfectly. It saves a lot of time by not having to figure out the correct pressure for anyone of the 15 trailers I may connect to in many different load configurations.




This airlift smart lift 2 is the best idea yet! I had the wireless one and the module went out. I looked for a replacement and finally decided to just air it up manually.
Then this version became available. Just what I needed. The weak link in the wireless one system is no longer needed. Just load the truck and let the system take care of the rest.
I love it. Thanks Air lift!

Ps. The price match guarantee is a real thing.


Still loving my air lift auto leveling system. Still working great. Great value. No need to worry about proper amount of air in the bags. It’s automatic. Thanks!
Tracy - 08/12/2021


Had this on my 3500 towing my 5th wheel camper for a year now and it keeps the truck level. It is reliable and smooth riding. Helps handling while towing like I could not believe.


Operations are perfect. I drive 8-10k miles a month and always have a trailer behind me. Constantly changing my loads and the system works great. The pump is Kinda loud but it doesn't bother me.




I tow a 5th wheel camper & boat around the country in search of great fishing adventures. The Airlift is a necessity for my F-150 Ecoboost. I have met people on my travels that did not have the automatic leveling and they had regretted not getting it after seeing how my truck was self-leveling. It doesn’t matter if I am towing the camper or the boat or just running into town for groceries, my truck level is always perfect for the job at hand. If you’re towing heavy loads, the Airlift 5000 is excellent and I highly recommend the automatic “SmartAir System”. Don’t forget to order your Airlift kit with the Stainless Steel hardware option. I was able to install both kits by myself in a day. The online instructions were very helpful.

I still love it! We needed some gravel for the yard and I was able to carry 1 1/2 tons with no problems. Don’t forget to upgrade your tires & brakes if you’re going to do this.
Jeffrey - 02/11/2020


I like the system. Easy to install and very convenient. One problem though. The compressor turns on and off by a magnet being out of center with a sensor. When you hook up, the sensor drops below the magnet, the compressor kicks on and inflated the bags until the sensor is level with the magnet again
then the compressor shuts off. If your load is too heavy, it will never level out and therefore the compressor will never turn off. My compressor burnt within a year of purchasing because of this. Airlift sent me another compressor for free, but it's only a matter of time until this happens again. Airlift doesn't have any data on maximum tongue weight with this system before you have that problem. But I can say from experience that it can't handle 9500 pound tongue weight.


Great product if your looking for an easy way to keep your truck leveled. Like that the kit is fairly easy to install and I can hook up a trailer and the Smart Air system takes care of the rest.


After 1 year I am happy to say it has not given a minutes worth of trouble. The truck hauls lumber and construction supplies almost daily and it just does what it is supposed to do without anyone having to do a thing. I have this same system on another truck that has been working for about 10 years now and it also has given no problems. I would not have an airbag setup without this auto leveling system.


This lift assist works great. I did have to replace the air pump at 10 months old. The warranty covered it all... I have an older one on a PU and it still works great.


e-trailer proved excellent customer support during a recent back-order. Updates were timely and I was advised that the items were now in stock and shipping.

Excellent vendor...I will use again and would highly recommend them to anyone.


The kit came with everything that I needed it was an easy install. The The compressor seems a little louder than it should be but I guess that is the design of it.


worked great


Product works great, instructions included were a little sketchy, and i was missing some parts, so be sure to verify package content before beginning install. cant wait to put it to the test and get my trailer hooked up.


Amazing shipping times and great produc t!




Works as designed



Price was good free shipping and it arrived in two days the install was not difficult



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