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Restore Ride Height With Proven Off-Road Coil Springs
The ARB 4001 front coil spring set uses X5K micro-alloyed spring steel to deliver a controlled lift while supporting the added weight of winches, bumpers, and skid plates on the Toyota 4Runner. ARB4001 pairs OME engineering with a matte black powder coat finish for long-term corrosion resistance on trail-driven trucks.
Key Features
- ARB4001 springs are built from X5K micro-alloyed spring steel
- Delivers a 1 to 2 inch front lift over stock ride height
- Spring rate of 588 lbf per inch matched to 4Runner front axle loads
- Matte black powder coat resists corrosion and chipping
- ARB4001 sold as a complete front pair for consistent ride height
- Compatible with factory and ARB Nitrocharger front struts
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 2003-2023 | Toyota | 4Runner |
Specifications
| Detail | Value |
|---|---|
| MPN | ARB4001 |
| Brand | ARB / Old Man Emu |
| Spring Material | X5K Micro-Alloyed Spring Steel |
| Spring Rate | 588 lbf/in |
| Free Height | 14.5 in |
| Coil Weight | 11 lb |
| Prop 65 Warning | No |
| UPC | 9332018098986 |
What's Included
- Two ARB4001 front coil springs
- Installation hardware
About ARB
ARB has produced Old Man Emu suspension systems since the 1970s, engineering coil springs and shock absorbers specifically for four wheel drive vehicles carrying touring and off-road equipment. The 4001 front spring set continues that heritage with a direct-fit design for the Toyota 4Runner platform.
FAQ
What is the ARB4001?The ARB4001 is a front coil spring set from ARB Old Man Emu designed for the Toyota 4Runner to restore or increase front ride height. It's built from X5K micro-alloyed spring steel and supports the added weight of off-road accessories.
How much lift will this actually give me?It provides approximately 1 to 2 inches of front lift depending on how much extra weight your truck is carrying.
Do I need new shocks to go with these springs?These springs work with your factory struts or ARB Nitrocharger struts sold separately, so new shocks aren't strictly required.
Will these hold up if I have a winch and bumper installed?Yes, the spring rate is matched to support the added weight of winches, bumpers, and skid plates on the 4Runner.
Can I install just one spring, or do they come as a pair?They're sold as a complete front pair so ride height stays even side to side.
Do these springs come with a Prop 65 warning?No, the ARB4001 doesn't carry a California Prop 65 warning.
Is this something I can install in my driveway?It's doable with a spring compressor and standard hand tools, though it does require removing and disassembling the strut assembly.
Will I need an alignment after installing these springs?Yes, since ride height and suspension geometry change, a wheel alignment afterward is recommended.
Install Instructions
- Raise the front of the vehicle and support it on jack stands.
- Remove the front wheels and disconnect the sway bar links.
- Compress and remove the factory front strut assembly.
- Remove the factory coil spring from the strut assembly.
- Install the ARB4001 spring onto the strut using a spring compressor.
- Reinstall the strut assembly, sway bar links, and wheels, then torque to factory specification.
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