Toughdog Rear Leaf Springs for Toyota 4Runner/Surf — Heavy Duty Upgrade

These Toughdog rear leaf springs are designed primarily as a load-carrying and restoration upgrade rather than a dedicated lift product. They will restore sagging rear ride height caused by accessory weight and wear, typically bringing your vehicle back to or slightly above factory ride height depending on your constant load. If you've added significant rear accessories like a bullbar, canopy or drawer system, these springs will level out your vehicle and prevent the rear-low stance that occurs with worn factory springs. For dedicated lift applications, these springs work best as part of a complete suspension system paired with front lift components — browse our complete range of lift kits for matched front and rear height increases.

This kit includes a matched pair of Toughdog heavy-duty rear leaf springs with corrosion-resistant coating, centre bolts, leaf spring hardware, and a complete U-bolt installation pack. The springs come with vehicle-specific bushes ready for installation. However, this kit does not include shock absorbers, shackles, spring hangers, or other suspension components which may need to be replaced or upgraded depending on your vehicle's condition and your performance goals. Many customers choose to upgrade their rear shock absorbers at the same time as the leaf springs for optimal performance and ride quality. Professional installation is strongly recommended to ensure correct spring seating, torque specifications and suspension geometry.

Yes, these Toughdog rear leaf springs are excellent for towing applications when correctly rated for your vehicle's constant accessory load. The progressive spring rate design provides increased stiffness under load, which significantly reduces rear squat when towing caravans, camper trailers or boat trailers, maintaining safer suspension geometry and proper headlight aim. However, spring rate selection should still be based on your permanent accessory weight, not towing loads. For maximum towing versatility and the ability to adjust for different trailer weights, consider pairing these leaf springs with airbag suspension which allows you to increase rear support only when towing, then deflate for improved empty ride comfort when not towing.

While not mandatory, upgrading your rear shock absorbers at the same time as your leaf springs is highly recommended, especially if your existing shocks have covered more than 80,000km or show signs of wear such as oil leaking, excessive body roll or poor damping control. New springs with worn shocks will not deliver optimal ride quality or handling performance. Toughdog offers matched shock absorbers designed to work perfectly with these leaf springs, providing the correct damping force for the spring rates and ensuring balanced compression and rebound control. Installing both components together also saves on labour costs by completing all rear suspension work in a single service, and ensures your entire rear suspension system is fresh with matched service life.

Yes, a full four-wheel alignment is absolutely mandatory after installing new rear leaf springs and should never be skipped. Replacing leaf springs can change the rear axle's position relative to the chassis, which affects rear toe settings and can also influence front suspension geometry through changes in vehicle rake angle. Driving without proper alignment after spring replacement will cause premature and uneven tyre wear, poor handling characteristics, and increased fuel consumption. The alignment should be performed after installation but may need to be rechecked after 500km once the springs have fully settled and bushes have seated properly. Always use a reputable alignment shop experienced with 4WD vehicles who can work to manufacturer specifications or recommended modified specs for lifted vehicles.

Selecting the correct spring rate is based entirely on your constant accessory load — the total weight of all permanently fitted accessories you carry every day. Calculate the combined weight of your bullbar, rear bar, canopy or hardlid, drawer systems, dual batteries, long-range fuel tanks (when full), roof racks, fixed camping equipment, and any other permanent modifications. Do not include occasional loads such as camping gear, passengers, or towing weights in your calculation — these are temporary loads that should not influence spring rate selection. If you select springs that are too heavy for your actual constant load, you'll experience an excessively harsh ride, accelerated wear on shock absorbers and other suspension components, and reduced comfort for daily driving. When in doubt, it's better to err slightly on the softer side and add airbags for occasional heavy loads.

These Toughdog rear leaf springs are designed primarily to restore or maintain correct rear ride height under load rather than provide significant lift for larger tyre clearance. While they will prevent rear sag and may provide a modest height increase over worn factory springs, they won't typically create additional clearance for significantly larger tyres on their own. Tyre clearance is determined by multiple factors including guard shape, suspension compression travel, and overall lift height achieved by both front and rear suspension components working together. If your goal is to fit larger tyres, you'll need to consider a complete lift kit that includes front suspension lift components to match the rear, and potentially modifications such as guard trimming or aftermarket flares. Contact our team to discuss complete suspension solutions for your specific tyre size goals.

Toughdog rear leaf springs are backed by the manufacturer's comprehensive Australian warranty, protecting against defects in materials and workmanship under normal operating conditions. The warranty coverage is one of the most comprehensive in the Australian 4WD suspension industry, reflecting Toughdog's confidence in their engineering and manufacturing quality. Warranty terms require professional installation with correct torque specifications, appropriate spring rate selection for your actual constant load, and normal maintenance including regular inspection of bushes and hardware. The warranty does not cover damage from overloading beyond rated capacity, incorrect installation, accident damage, or modifications. Keep your purchase receipt and installation records for warranty claims, and contact us if you experience any issues — we'll work with Toughdog to resolve any legitimate warranty concerns quickly.

Absolutely — when correctly rated for your constant accessory load, these Toughdog leaf springs deliver excellent on-road comfort for daily driving, highway cruising and urban use while providing the additional capacity needed for touring and work applications. Unlike cheap aftermarket springs that are often over-rated and excessively stiff, Toughdog's progressive spring rate design provides a comfortable unladen ride that progressively firms up as weight is added. This means you'll enjoy near-factory ride quality for your daily commute, but with the confidence that your suspension won't sag or bottom out when you load up for a weekend camping trip or head out on an extended touring adventure. The key to maintaining good daily driving comfort is honest spring rate selection based only on your permanent accessory weight, not occasional or towing loads.