See what our Experts say about this Firestone Vehicle Suspension

• Should I Run a Sumospring and Firestone Air Bag Kit on 2019 Toyota 4Runner
  Hey Lynn, we generally don't recommend running more than one set of suspension enhancement on a vehicle because the performance of the two kits together has never been tested and most likely if you need two you are overloading things. I would first try the SumoSprings kit part # SS68DR though as that is most likely going to get you exactly what you are looking for and then from there decide if adding more support with an air bag setup like the Firestone part # F4135 is needed.
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• How Can I Stop my Air Helper Springs From Leaking
  The most common issue with air bags like the Firestone Coil-Rite Air Helper Springs part # F4135 is the connection of the air line to the other components. It is recommended to use a spray bottle with soap water to spray each fitting to see which is leaking. Once you have found it remove the air line and re cut it. Make sure to get a very straight even cut. An angled or crooked cut will cause leaking every time. Then place it back in and retest.
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• Will Firestone Air Springs Fit 2019 Toyota 4Runner With Lift
  Hi Ed, So long as the coil springs on your 2019 Toyota 4Runner remain the stock size, the Firestone Coil-Rite Air Helper Springs # F4135 will fit. They'll still give you excellent support for your 4Runner's rear suspension as you're towing or even just have a heavy load in the back.
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• Where to Find Leak in Firestone Air Bag in Coil
  Hey Charles, sorry to hear about the leak. What I would do before doing anything too complicated is for sure narrow down where the leak is. You can do this by spraying soapy water on the bags and the line and where the leak is you'll see bubbles.
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• Will the Firestone Coil-Rite Air Helper Springs Work With a 2021 Toyota 4Runner W/ 3" Lift
  If you didn't change out the coil springs then the # F4135 will work fine with your 2021 Toyota 4Runner. If you did change out the factory springs to a different spring that has a different diameter then I am going to need to know the inside diameter of the spring with the vehicle weight on the springs. This will tell me what size bag should be ordered with the Firestone Coil-Rite Air Helper Springs # F4135.
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• Transmission Cooler and Air Bag Kit for Towing with a 2008 Toyota 4Runner Limited V8
  An additional transmission cooler as well as some suspension enhancement will help to keep your 2008 Toyota 4Runner from wearing out as quickly because of the stress of towing. One of the best transmission coolers that we have is the Derale Series 8000 Plate-Fin Transmission Cooler Kit # D13503. There aren't any specific fits when it comes to coolers so you want to try to install the biggest cooler you can. This cooler measures 11" wide x 8-3/4" tall x 7/8" deep. You can reference the...
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• Can Firestone Coil Rite Kit fit on 2023 Toyota 4Runner
  Hey Doug, so if you install a lift kit on your 2023 Toyota 4Runner the Firestone kit part # F4135 would only be able to still work if it was a body lift. If the lift is a suspension lift and the coils would be different it wouldn't be able to work.
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• How to Reattach a Weight Distribution System to a Trailer
  There are a few different weight distribution systems so in order to give you exact instructions I would need to know which system you have. However, the process to reattach the system to a trailer is fairly similar for most of them. If your system uses link chains to connect the spring bars to the frame brackets then in order to reattach the system to the trailer you will need to first install the head and shank back into the trailer hitch. Once the head and shank are in position you...
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• Compressor And Air Bag Kit For 2020 Toyota 4Runner
  Hello Kaleb, thanks for reaching out. The Air Lift WirelessAIR Compressor System for Air Helper Springs # AL74000EZ will work regardless of what brand or style of air bags you choose. They all use the same fitting and air hose sizes. The sumo style bumps stops you mentioned do not use air, they are made of a microcellular urethane so a compressor will not be required for that. For your 2020 4Runner, the correct coil helper is part # F4135. If you want a sumo spring go with the SumoSprings...
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• Helper Spring Recommendation for 2021 Toyota 4Runner Towing 3700 lb Travel Trailer
  Of the available choices, I prefer the SumoSprings # SS68DR which would provide up to 1400 lbs of additional support for your rear suspension which would work great to counteract the tongue weight of your travel trailer. Not only will the SumoSprings prevent sag from the tongue weight of your travel trailer being applied to the rear suspension of your 4Runner, it'll also minimize sway and body roll in turns. Unlike the # F4135 air helper spring you'd looked at, the SumoSprings will never...
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• Will the Firestone Coil-Rite Air Helper Springs # F4135 Fit a 2015 Toyota 4Runner with 2 inch Lift
  Since you have a 2 inch lift on your 2015 Toyota 4Runner you will need to do adjust the Firestone Coil-Rite Air Helper Springs # F4135 to accommodate the 2 extra inches. You can try cutting the bump stops so that they are 2 inches longer than what the installation instructions call for, but that has not been tested so you wouldn't necessarily know what the weight capacity rating would be. I spoke with my contact at Firestone and he said that he doesn't have any airbags that are fit the...
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• Rear Air Bag Helper Springs for a 2015 Toyota 4Runner
  The ideal solution to level a vehicle that is sagging when towing a trailer is weight distribution and not helper springs. I can recommend both but for weight distribution you need to go by the total tongue weight. This is the tongue weight of the trailer when loaded and ready to tow plus the weight of anything carried behind the rear axle of the tow vehicle. Air bags such as # F4135 for your 2015 Toyota 4Runner are going to offer a better ride and more adjustability than Coil Sumo Springs...
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• Firestone Coil-Rite Air Helper Springs # F4135 Installation On 2016 Toyota 4Runner
  I reached out to my tech contact at Firestone, and he said that as long as there is no pinching or crimping of the air line, you can install the Firestone Coil-Rite Air Helper Springs rightside up or upside down. They will function the same as long as they have the lines running without interference.
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• Suspension Enhancement/Helper Spring Suggestion for 2022 Toyota 4Runner
  The Firestone # F4135 Coil-Rite air helper springs you'd looked at are a fit for your 2022 4Runner, but unless the load you carry in the cargo area or the trailer's tongue weight will vary to a large degree, you really won't need the adjustability provided by an air helper spring system. I prefer a bump stop replacement like the SumoSprings # SS68DR. The SumoSprings won't affect your vehicle's ride until there's some compression applied to the rear suspension. With this system you won't...
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• How to Remove Air Line From Spring of Firestone # F4135 Coil-Rite Air Helper Springs on 2001 4Runner
  In order to remove the air line from the push connector on the coil air bags, you'll need to use a pair of needle nose pliers and grab the collar on the connector. If you push the collar toward the air bag and pull on the air line at the same time, the line will easily come out of the connector. If you'll be cutting the air lines, Firestone recommends using an air line cutter like # AL10530 to guarantee a clean cut. If the cut is rough, or isn't perfectly perpendicular, the connection...
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• Can Firestone Coil-Rite Air Helper Springs be Used on 2019 Toyota 4Runner With KDSS
  You can absolutely use the Firestone Coil-Rite Air Helper Springs # F4135 on your 2019 Toyota 4Runner with the Kinetic Dynamic Suspension System (KDSS). This dynamic system will not affect the helper springs because the springs are installed inside the coils of your 4Runner. There are no separate installation instructions for the KDSS version, which has been around for quite some time. I checked the instructions for other vehicles with this system as well as fits to ensure this. I recommend...
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• Suspension Enhancement Options for 2020 Toyota 4Runner
  We have two options for suspension enhancement for your 2020 Toyota 4Runner which have pros and cons. The air bag kits like the Firestone part # F4135 have the advantage of being very adjustable which allows you to have the suspension support when you want it and then have the full ride quality of your vehicle when not needed since you can deflate them. The disadvantage is that the install is a bit more involved and you have to maintain air pressure in the bags. This is better for someone...
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• Could Air Lift Coil Rite Kit for 2016 Toyota 4Runner Install without Removing Coil Spring
  If you are able to cut the jounce bumper of your 2016 Toyota 4Runner off while leaving the coil installed on the vehicle you certainly could fit the air bag between the coils to install the # F4135 since this is commonly how it's recommended bag kits like this get installed.
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• Recommended Air Springs for 2018 Toyota 4Runner TRD Off Road
  The Firestone Coil-Rite Air Helper Springs - Rear Axle # F4135 is the correct fit for your 2018 Toyota 4Runner TRD Off Road. Air Lift brand doesn't have a confirmed fit at this time for your vehicle, so I recommend using the Firestone brand. This air spring will fit inside the coil springs to provide additional support. If you want to utilize a compressor system to adjust the air in your springs I recommend using the Air Lift Air Shock Controller Compressor System for Air Shock Absorbers...
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• Suspension Enhancement Options For 1999 Toyota 4Runner
  I do have some Firestone Coil-Rite Air Helper Springs # F4135 for your rear axle. If your springs have lost some compression and your rear end feels sloppy, these will help tighten up the back suspension to help especially if you have a trailer connected to your 1999 Toyota 4Runner. If you're bottoming out when hitting bumps/dips in the trails you will want to get the Timbren Active Off-Road Bumpstops # TABSTOR4R for the rear. This will only make a difference if your suspension is being...
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• Can A Motorcycle Be Carried On the Back of a 2007 Toyota FJ Cruiser
  If the weight of your motorcycle and motorcycle carrier is less than the tongue weight capacity for your 2007 Toyota FJ Cruiser then yes, this is feasible. I have personally seen motorcycles being carried on the back of a FJ Cruiser so it is realistic and they do offer trailer hitches and hitch mounted motorcycle carriers so it is also possible. If you don't already have a trailer hitch then the Curt Trailer Hitch Receiver part # 13367 is what I recommend. It sounds like you already...
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• Recommended Rear Suspension Enhancement For a 2022 Toyota 4Runner TRD Pro
  The Firestone Coil-Rite Air Helper Springs # F4135 is the kit that is confirmed to fit the rear suspension on your 2022 Toyota 4Runner TRD Pro with the Fox shock suspension. As this fits into the rear coil springs on your 4Runner there is no need for any spacers. If you off road your 4Runner I recommend going with the SumoSprings Solo Custom Helper Springs # SS68DR. These progressive springs are built with a microcellular urethane that is not as likely to become damaged when off road....
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• When Should Air Bag Style Suspension Enhancement Have Air Added to the Bags
  With air bag kit the best time to inflate them is after the vehicle is loaded. This allows you to inflate the bags to the needed pressure to allow the vehicle to sit as level as possible.
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• Recommended Suspension Enhancement System For 2004 Toyota 4Runner
  I recommend installing the Timbren system # TTORSEQ over the Firestone # F4135. Since you said you occasionally tow or carry a maximum of 3,000-lbs, the Timbren system would be a nice option because you do not have to make any adjustments to the system. As more weight is added to the vehicle either from tongue weight when towing or loading the back of the vehicle, the Timbrens will stiffen to provide more support for the load. Using the Firestone system means you will need to adjust...
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