How do I adjust the spring rate?

You can control the air pressure in the air helper springs, making adjustments for varying loads and road conditions. Spring performance can be altered as easily as inflating a tire.

What temperature range can these springs handle?

Firestone Coil-Rite air helper springs are designed to work in temperatures between 180 °F (82 °C) and -40 °F (-40 °C). That should cover pretty much any environment you'll encounter.

What is the weight capacity of these springs?

The air springs will support 500-1000 lbs per set. Remember not to exceed your vehicle's GVWR (Gross Vehicle Weight Rating).

Firestone Coil-Rite Air Helper Spring Kit Rear 98-17 Toyota 4Runner (W237604135)

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Firestone

Firestone Coil-Rite Air Helper Spring Kit Rear 98-17 Toyota 4Runner (W237604135)

Name: Firestone Coil-Rite Air Helper Spring Kit Rear 98-17 Toyota 4Runner (W237604135)
Brand: Firestone
Price: 158.89 USD
Availability: InStock

$158.89

Air springs fit inside your existing coil springs, leveling your vehicle and improving handling under heavy loads.

Key Features

Variable Spring Rate — Adjust spring rate by changing air pressure.
Levels Vehicle — Keeps your 4Runner level, even with heavy loads.
Improves Handling — More effective braking and handling, even under heavy loading.
Durable Construction — Made of elastic polyurethane for long life.
500-1000 lbs Capacity — Supports 500-1000 lbs per set (not to exceed vehicle's GVWR).