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Firestone 4135 Rear Coil Rite Air Spring kit for FJ Cruiser 4Runner LX 570

Q: Do i need te change my rear stock shock?

No need to change the shock, but you will need to remove both to complete the installation. If you are contemplating replacing the shocks with new ones, this would be a good time to do that. These bags have worked great for me on keeping the 4Runner leveled out while carrying suitcases or towing trailers. Great investment and helps to keep your driving safe.

Q: Any 3rd gen 4Runner owners using these bags successfully with 891 rear springs (about 2.5" lift)?

I'm using them in a 4th gen with FJ cruiser springs. They work well for me. They're not supposed to be compressed top/bottom to support the load. They expand inside the coils to reinforce them. You may have to play with your coil bumpstops. It's says "not for lifted" vehicles though so I'd check with the manufacturer.

Q: how much additional weight can these support?

These can support a 500-1000 leveling capacity.

Q: Will this fit 2014 ram 2500 with five inch rough country lift?

Go to Firestone’s website. They have a find your kit feature.

Product ID: 12429200

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📏4.75 in diameter x 7.5 in length

🔧No drilling required installation

⚙️1000 lbs load capacity

Frequently Bought Together

Firestone Ride-Rite 4135 Coil-Rite; Air Helper Spring Kit; Rear; Incl. Air Helper Springs; Supports; Hardware; Air Line; And Inflation Valves; No Drilling Required; Number W237604135;

Air Lift 21838 Union Tee, Silver

Description

🚙 Elevate your ride with Firestone’s coil spring kit—where power meets precision!

PRECISION FIT - Designed specifically for 1998-2012 Toyota 4Runner, FJ Cruiser, and LX 570 rear coil springs
EFFORTLESS UPGRADE - No drilling required—easy bolt-on installation saves time and hassle
DURABLE ENGINEERING - Firestone’s trusted air spring technology ensures long-lasting performance under pressure
LOAD WITH CONFIDENCE - Supports up to 1,000 lbs for superior rear axle stability
OPTIMIZED RIDE QUALITY - Enhances rear suspension for smoother drives and improved handling on and off-road

The Firestone4135 Rear Coil Rite Air Spring kit is engineered for 1998-2012 Toyota 4Runner, FJ Cruiser, and LX 570 models, delivering up to 1,000 lbs of load support with a 4.75-inch diameter and 7.5-inch length air spring. Featuring a no-drill installation, this kit enhances rear suspension stability and ride quality, making it an essential upgrade for serious drivers seeking durability and performance.

Specifications

Manufacturer	Firestone
Brand	Firestone
Model	Firestone
Item Weight	2.43 pounds
Product Dimensions	11.61 x 2.5 x 9.32 inches
Item model number	4135
Manufacturer Part Number	4135
OEM Part Number	4135
Special Features	Air Spring Diameter: 4.75 inches, Air Spring Length: 7.50 inches, Capacity: 1,000 lbs., Drilling Required: No, Replacement Air Spring: 6024, Location: Fits Rear Axle

Have a Question? See What Others Asked

Do i need te change my rear stock shock?

Any 3rd gen 4Runner owners using these bags successfully with 891 rear springs (about 2.5" lift)?

how much additional weight can these support?

Will this fit 2014 ram 2500 with five inch rough country lift?

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