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FITS 2008 Jeep Grand Cherokee
Firestone Coil-Rite Air Helper Springs - Rear Axle

Firestone Coil-Rite Air Helper Springs - Rear Axle

Item # F4157
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2008 Jeep Grand Cherokee

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The best technical support and full vehicle suspension installation instructions. Lowest price Grand Cherokee vehicle suspension guarantee and expert service. Jeep Grand Cherokee, 2008 vehicle suspension by Firestone are available from etrailer.com. For expert service call 800-298-8924 to order your Firestone Coil-Rite Air Helper Springs - Rear Axle part number F4157, or order online at etrailer.com.
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2008 Jeep Grand Cherokee - Firestone Coil-Rite Air Helper Springs - Rear Axle

  • Firestone
  • Air Springs
  • Rear Axle Suspension Enhancement
  • Light Duty

For safety and stability, air springs are the perfect partner for your rear suspension when you are hauling heavy loads. Springs fit inside existing coil springs to help level your Jeep Grand Cherokee, improve braking and handling, and reduce tire wear.


Features:

  • Provide extra support for your existing rear coil springs
    • Fit inside existing coil spring suspension on your vehicle
  • Keep your vehicle level when you are hauling a heavy load
    • Improve steering control and balance
    • Level your headlight beams
    • Reduce tire wear
  • Maintain even load distribution with air pressure, leveling off-center loads
    • Air bags adjust manually, side to side, with individual inflation valves
  • Enable more effective braking and handling
    • Work under heavy loading and adverse road conditions
  • Increase stability to promote a smoother ride and prevent bottoming out
  • Made of durable, elastic polyurethane for years of comfort and stability
  • Include all materials necessary for installation
    • Brackets, air springs, hardware, air line and separate valves for manual inflation
    • Switches and gauges, compressors, and air tanks (sold separately) are available for quick and easy air spring inflation/deflation from inside your vehicle
  • Made in the USA


Specs:

  • Load-leveling capacity: at least 500 lbs (at most 1,000 lbs)
    • Coil-Rite springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.
  • Adjustable air pressure: 5 psi to 35 psi
  • Limited lifetime warranty on air springs
  • 2-Year limited warranty on hardware


Firestone Coil-Rite Air Spring Basics

Firestone Coil-Rite springs fit inside your existing rear coil springs to maximize the effectiveness of your suspension system. The added cushion provided by the air springs allows your vehicle to better handle a heavy load or trailer. Hauling heavy loads or towing a heavy trailer can make the rear of your vehicle sag and the front end rise. This puts more strain on your rear axle and reduces contact between your front tires and the road, causing problems with braking, steering control and traction. By adding air springs to your rear suspension, you can help to level your vehicle for more effective braking and handling under heavy loading or when you encounter adverse road conditions. The air springs also help to level your headlight beams and reduce wear on your tires.


Firestone Coil-Rite airline installation

Adjustable Air Pressure

The air pressure in your Coil-Rite springs can be adjusted manually, side to side, to compensate for off-center loads. A centered load improves the stability of your vehicle by reducing body roll. The air springs will also help to absorb road shock and soften contact between your axle and frame. This prevents bottoming out, thus improving ride comfort. Route the air line tubing for the springs to your vehicle's bumper to provide easy access to the manual inflation valves.


Firestone Coil-Rite air spring components

Air Spring Construction

Coil-Rite springs are constructed of durable, elastic polyurethane to ensure years of service. Single replacement springs (sold separately) are available for maintenance to an existing Coil-Rite kit.


Air Spring Installation

The Coil-Rite springs install inside your existing coil springs. The custom-fit springs attach to your vehicle's spring seats.



W237604157 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

Firestone 4157

Installation Details F4157 Installation instructions


Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4157

Average Customer Rating:  4.4 out of 5 stars   (262 Customer Reviews)

For safety and stability, air springs are the perfect partner for your rear suspension when you are hauling heavy loads. Springs fit inside existing coil springs to help level your vehicle, improve braking and handling, and reduce tire wear.

- F4157
by:
2010 Jeep Grand Cherokee

Pretty easy install and product works great. Pulling our 22 ft crownline with our 2010 jeep grand Cherokee is much better all around. 825031



- F4157
by:
2005 Jeep Grand Cherokee

Picture of the spring helper. Air line really needs to be on the side if possible. 514140



- F4157
by:
2005 Jeep Grand Cherokee

Instructions are weak. They do not explain how to get the "jounce" bumpers out of the coil springs. Secondly, I cannot locate the air leak, but figure it must be on top of one of the air bags and that the jounce mount might be hitting the elbow for the air line. Not a very good design. 78945


Comments
My 2008 Grand Jeep Cherokee Overland has those yellow things jounce bumpers inside the coil also. Do those need to come out? Is it ok then that the bag doesnt fully occupy the space vertically?
-- comment by: Michael B - 11/27/2013

2365

The jounce bumpers do need to be removed to install the kit. Once the veichle is lowered off the jack stands and supporting its own weight, the slack will be taken up. If you do go for an air spring kit, I strongly recommend purchasing a tubing cutter to go with it. A lot of leak problems are cause by out of square cuts with a box cutter. Check out F9009 and AL10530.

-- Patrick B - 12/2/2013


- F4118
by:

Review from a similar Coil-Rite in Vehicle Suspension


I received my order and installed the Air Helper Springs the next day. I had the opportunity to fully test them yesterday. They were not difficult to install and the instructions were easy to follow. I do wish there had been a video for my particular vehicle since I’m not exactly sure my routing of the air line around the exhaust the best location. Time will tell. After hooking up my trailer I adjusted the air, best I could, since all my tire gauges start at 10 lbs and go up from there. I did get the rear of the Pathfinder as level as I could. A recommendation from etrailer on a good digital or analog gauge would have also been helpful. I did pick up a digital gauge today, works great. Thanks etrailer for a great products, instructions and your follow up email that answered my questions, 513109


Comments
Excellent! I use it when I tow my equipment trailer and I haven’t had “any” problems. I did alter the hose configuration to a single point of air input instead of a valve for each bag. I know their reasoning but single input works better for me.
Kevin S - 05/26/2019

55749

- F4118
by:

Review from a similar Coil-Rite in Vehicle Suspension


Good product. takes some effort getting the bag inside the coils. As far as removing the frame bumper - didn't do it - it is pressed in between the frame and top of coil spring. So far so good 514375



- F4170
by:

Review from a similar Coil-Rite in Vehicle Suspension


Product is what you see on the web page and the videos exclent its idiot prove 411973



- F4174
by:

Review from a similar Coil-Rite in Vehicle Suspension


Thanks to all of the folks who shared their observations on the installation of Firestone Air Helper Springs on Toyota RAV4s. Some of their suggestions made my life much easier. The Firestone instructions, as others observed, were pretty generic and were probably not written by a person who actually installed them on a RAV4. Here are a few things that I found useful: I found that the easiest way to cram the air bags into the coil springs was to flatten them like a pancake with the top and bottom surfaces collapsed onto each other and lash them in this state with a zip tie. Compressed this way you can push them thru the gap in the coil spring in the correct orientation so that when you release the zip tie they expand into the coil spring correctly. It helps to push them thru an opening just below the center of the coil spring so that the air bag ends up slightly below center touching the bottom plastic protective disk. It is really difficult to move the air bags up or down once they expand into the coil spring. I attached the air hose after the bag was in place. You can use a heat gun to warm the air hose enough to bend it so that it exits the lower control arm, turns 90 degrees, and runs along the back of the control arm without hanging down. As others noted the exhaust system presents special problems on the right side. I ended up routing the air line toward the brake and up to the upper control arm to stay away from the exhaust pipe. It's not clear what the best strategy is for routing the air lines. They seem pretty tough, but will likely be rubbing on something given all of the movement in the suspension. I'd suggest not cutting the air line and starting with the right side, which for me needed more air line length to keep away from the exhaust system. That way you will have enough air line to finish the right side and you can use the remainder on the left side, which will need less. I cut the line in half to begin with and barely had enough for the right side. All of the bits seem to be of high quality. The quick connect air fittings seem to seal well and grab tenaciously so you will have a very hard time removing them once you install them. Like a Chinese puzzle on steroids. Our trailer has around 440lb tongue weight and these have brought us back to level with a few psi to spare. We'll see how it goes over the road. Thanks to everyone who contributed ideas and suggestions. 161229



- F4118
by:

Review from a similar Coil-Rite in Vehicle Suspension


I got the a draw tite hitch, wiring harness and Firestone coil helpers for my 2016 Nissan pathfinder. Everything fit great and was easy to install. The price was awesome and shipping was super fast. An easy A+ for etrailer.com. 343985



- F4105
by:

Review from a similar Coil-Rite in Vehicle Suspension


Did not work at all on my 11altima. No change to the suspension and the bags deformed beyond recognition after 2 weeks 260702



- F4118
by:

Review from a similar Coil-Rite in Vehicle Suspension


Easy installation fixed my problem of low ride height. The only thing I would change is I wish there was a 90° angle for the bottom so it doesn't stick so far out I know it's going to end up catching things on the road 595108



- F4155
by:

Review from a similar Coil-Rite in Vehicle Suspension


I installed Firestone Coil-Rite Air Helper Springs and they work great. With minimum air pressure they improved the unloaded ride and driveability. Loaded the van for vacation, added air pressure to bring the ride height back to the normal ride level and the van drove and handled better than when it was new. Followed your on-line installation video and installation was a breeze. The installation instructions with the kit were poor and incomplete. . 139788



- F4174
by:

Review from a similar Coil-Rite in Vehicle Suspension


As a former mechanic, this was a tough install. It was a struggle to get the air bags through the springs and there was not enough room to remove the 3" piece of tubing so I installed the bag with the full length of tubing already in place. I was hoping to gain about a 2" lift, but it only raises the vehicle about 3/4 of an inch. The bags do make a noticeable difference in handling and the hitch is not so close to the ground while hauling a trailer. 103341



- F4118
by:

Review from a similar Coil-Rite in Vehicle Suspension


We ordered a suspension kit it came right away and at a great price. We had checked out several shops in town who said they were hard to get for our new vehicle and the cost was out of this world. Great job guys 165779



- F4118
by:

Review from a similar Coil-Rite in Vehicle Suspension


I've installed the air springs and and they hold up great. I'm pulling a tall 5 x 10 enclosed trailer and no more sagging in the rear end. Air up the bags to 35 max PSI and the ride quality is excellent. 715974



- F4155
by:

Review from a similar Coil-Rite in Vehicle Suspension


This Firestone #F4155 air-bag product is excellent. The fit to my 2011 Toyota Sienna was just as described. I installed the bracket and the two air-fill valves in the jack compartment, easy to get to and out of the weather. etrailer has been a pleasure to deal with. 172005


Comments
Love the product. Had it installed by my favorite local Toyota dealer. Makes a nice difference towing our Park Liner Fiberglass Egg Camper. Would certainly recommend.
Bruce B - 02/01/2016

16645

- F4174
by:

Review from a similar Coil-Rite in Vehicle Suspension


Working out very well 735132



- F4170
by:

Review from a similar Coil-Rite in Vehicle Suspension


The F4170 kit does fit a 2009 Hyundai Santa Fe. However installation is not quite as simple as the video. In order to remove the jounce bumper and install the air bags on our All Wheel Drive the springs needed to be removed. The instructions show a 2" piece of air line at the bag and then a 90 degree union. Make that 1.5" and the union will not hit the top of the steel jounce bumper cup. Insted of a 7/16 inch hole for the lines, go bigger and put in a grommet so the line does not rub. I went to 5/8 inch and then used 3/8 fuel line to cover the air tubing. Protects it from getting cut and from heat at the muffler. I agree that the top spacers need work. No real retention or centering on top of the bag. I put RTV silicone on the spacer and then placed it on the air bag. It centered on the bag and it should stay put. When the vehicle is off the ground and the springs are at full extension, and the jounce bumper cup does not touch the spacer. With the bigger hole, the fuel line guard, and the RTV I hope the work for a while. If not the bags are lifetime warranty and the hardware has 2 years. 98925



- F4175
by:

Review from a similar Coil-Rite in Vehicle Suspension


Product installed without any issues. Do suggest taking a paper towel or rag and spraying a small amount of WD40 on it and wiping around spring coils only not on air bag. Bags slide in a little easier. Would have been 5 Star except for unacceptable shipping time, 5 days to on instate location 200 miles away. 579207



- F4176
by:

Review from a similar Coil-Rite in Vehicle Suspension


Used the Air Helper Springs on a VW Jetta to help when we put the 4 bike rack on it. Worked perfectly, kept us level when loaded and letting the air out gave us the ride when empty. Bike pump easily pumped them up when needed. I would recommend this product for anyone needing to control ride height under load or when towing to stiffen the suspension. We have had them installed for over a year. Way to go eTrailer! 240426


Comments
Continues to work well. Would recommend without reservation
Tim F - 03/09/2017

22663

- F4124
by:

Review from a similar Coil-Rite in Vehicle Suspension


Review is for very helpful service- got into a time squeeze, made a call on Sunday, and received the correct part on Tuesday AM. No review on product yet, but it looks like it should work well. The go into the rear coils of a Toyota Sequioa and are currently being installed. 662780



- F4179
by:

Review from a similar Coil-Rite in Vehicle Suspension


I installed these on my 2006 Honda Odyssey to pull an 18ft (total length) popup camper. My van used to bounce pretty good through intersections and would occassionally bottom out on the big bumps. After putting these in, it rides nice and level, and hardly bounces at all, improving the ride for passengers and popup alike. One note, I had them installed at a local shop and he ran the airline so each stem comes out just in front of the rear wheels (through the bottom body panel) to avoid the exhause. 12359



- F4155
by:

Review from a similar Coil-Rite in Vehicle Suspension


I'm very happy with my Firestone Coil-Rite kit for my '06 Sienna. I added a "Tee" to join the bags together and routed the schrader valve to exit inside my fuel fill door. It was a little extra work, but well worth it as it's out of the weather and sight, and I don't have to scrabble around on the ground in the slop to check / adjust the pressure. I run 15 -17 lbs when I'm not hauling a load and that seems to help with body roll, and up to 25-28 psi fully loaded. The kit does the job it was intended for, and hasn't leaked a snif of air since I installed it a year ago. Three thumbs up! 350292


Comments
Two years out, and still happy as a clam. Just do it!
Cal P - 03/11/2018

35738

- F4118
by:

Review from a similar Coil-Rite in Vehicle Suspension


Installation on 2014 Pathfinder didn't require Shock removal. It went in fairly easily. They are helpful although wonder if they shouldn't be slightly taller . With 5 passengers and trailer approx. 3500 lbs. still sags some. In my opinion Japanese cars all have Weak rear suspensions 139152


Comments
How did you install with the stop built into the top spring seat? Also did you run the air hose out the bottom? Thanks
-- comment by: Will - 08/13/2014

6226
Comments
To Will , To be honest, I didnt even look at the upper inside of the spring for a stop . I simply collapse the bags and worked them into the spring . Yes I have the air fitting and hose coming out of the bottom . I used extra cable ties to secure the hoses. I drilled NO holes in anything. I was carefully of routing the lines away from the heat of the exhaust. I mounted the Air fittings to the holes in the receiver. One complaint is that I have great difficulty in filling the them. I dont know if it is the Tire chuck I am using or the Fittings provided. I actually end up unscrewing the nut on the fitting and take the fitting and hose free from the receiver to press the tire chuck on far enough to fill them then remount the fittings to the receiver
-- comment by: Larry M - 09/30/2014

7059

Thanks for responding Larry. In the installation instructions Firestone recommends removing the factory jounce stop, or spring seat before installing the Air helper springs.

-- Rachael H - 10/1/2014


- F4155
by:

Review from a similar Coil-Rite in Vehicle Suspension


Excellent product, installed on 2011 Toyota Sienna that tows 3,000# Hybrid Travel Trailer. Works great to keep rear level (along with Anderson Hitch Weight Distribution). We now run air in them without the trailer as well to help prevent typical Sienna sag when loaded with people or loads. 252191



- F4185
by:

Review from a similar Coil-Rite in Vehicle Suspension


Great for a small trailer/camper. 87037


Comments
How big of a trailer are you towing with your Ram and did this kit help?
-- comment by: Jason W - 01/13/2014

2564
Comments
The kit was okay for one trip. The lines keep coming off then I lose air. I have had to fix the lines four times now I gave up, dont know if there is a real fix to this.My trailer is 18 feet.Any help would be appreciated.Thank you.
-- comment by: charles - 01/23/2014

2626

The lines need to be cut very cleanly and perfectly square. If there a little crooked or rough, the fittings cannot seal to the line. If you are using a knife or box-cutter or side-cutters to cut the line, your fix may simply be a proper line cutting tool like parts F9009 or AL10530. Make sure when you push the line into the fitting, that you push it all the way in until it bottoms out.

-- Patrick B - 2/4/2014

30
317
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Ask the Experts about this Firestone Vehicle Suspension

  • Helper Springs for a 2007 Jeep Grand Cherokee with 2 Inch Lift
    The air bag helper springs available for the 2007 Jeep Grand Cherokee do not have spacers that will work with them but you can use Timbren springs # TJRC04 by using some spacers, # A25723-90AH00. This is a single 1 inch spacer so you would have to use 4 of them total since you have a 2 inch lift. The use of spacers would only be needed if the lift on your Jeep makes the frame further from the axle (suspension lift). If it has just made the body higher up from the frame then spacers would...
    view full answer...
  • Will Air Bags Fit on a 2004 Jeep Wrangler Unlimited with 2 Inch Suspension Lift
    You would have to have the vehicle return to stock height in order to use the Coil-Rite system, # F4157, because of the extra space from the lift. There are no spacers for the Coil-Rite systems to adapter to the lift on the vehicle. What you may want to look at is a Timbren system, # TJFTJ, and added a couple of spacers per side, # A25723-90AH00, which is a 1 inch spacer. For 2 inches on each side you would need 4 total. The Timbren system will work to level the vehicle, especially...
    view full answer...
  • Finding Helper Springs for a Jeep Wrangler with Rock Krawler 3.5inch X Suspension Lift Kit
    The Firestone Coil-Rite Rear Axle Air Helper Springs, part # F4157, are intended for use with the stock suspension components in the 2006 Wrangler Unlimited. I called my contact at Firestone and he confirmed that these air springs are not compatible with your aftermarket suspension kit. I have included the installation instructions for this product just in case you do wish to review them. I checked for helper spring kits from other manufacturers such as Timbren and Super Springs that...
    view full answer...
  • Firestone Airbags Compatible with a 2005 Jeep Grand Cherokee
    The only Firestone kit they make for your 2005 Jeep Grand Cherokee is the Firestone Coil-Rite Air Helper Springs part # F4157. The Firestone Coil-Rite Air Helper Springs are similar to the Firestone Ride-Rite Air Helper Springs but mount inside the rear coil springs. The Coil-Rite Springs have fewer parts and are much easier to install. Both of the airbag kits will do a great job of maintaining even load distribution. The pressure is also adjustment meaning you can adjust the level of support/comfort. To...
    view full answer...
  • How To Prevent a 2007 Jeep Grand Cherokee From Sagging While Towing
    It is not uncommon to experience squat or sag while towing even if you are within the manufactures guidelines for the towing capacity of the vehicle. The easiest and most cost effective solution to fix this would be to add a set of rear suspension enhancements that you can use while towing. For this, I recommend the Firestone Coil-Rite Air Helper Springs part # F4157 since they are adjustable which means they won't affect the ride quality while you are not towing.
    view full answer...
  • Firestone Coil-Rite Air Bag Suspension for 1998 Jeep Wrangler Sahara
    According to Firestone, their # F4157 Coil-Rite Air Helper Springs are a compatible fit for your 1998 Jeep Wrangler Sahara Edition. They will install inside your coil springs, once the factory jounce bumpers are removed. For the installation, getting perfectly square cuts in the air line is crucial, which is why we recommend that a tubing cutter like part # AL10530 be used. You can look over the installation instructions by clicking the provided link.
    view full answer...
  • Front Helper Springs for a 2000 Jeep Wrangler TJ Sahara with Sno-Way Snowplow
    For your 2000 Jeep Wrangler (TJ) I recommend Timbren front helper springs # TJFTJ. These springs will provide better support than the Coil SumoSprings. Air bags could be used, the durability is not an issue, but for this application I find air bags to be unnecessary. They require maintenance, you have to add and remove the air compared to the Timbren springs that require nothing after the initial installation. Since the load of the plow is only at the front you would not need anything...
    view full answer...
  • Do Rear Coil Springs Have to be Removed to Install Airlift 1000 Rear Helper Spring System # AL60754
    Installation of the Airlift 1000 Rear Helper Spring System # AL60754 does require removal of the rear coil springs. You are also correct that some other rear axle air bag kits do not require this step, and can be slipped inside the coil springs while they remain in place. The kit you referenced fits Jeep Grand Cherokee model years 1999 through 2004. We do offer suspension enhancement kits for the 2008 Jeep Grand Cherokee and these can be seen on the link provided. You can use the...
    view full answer...

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Info for this part was:

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