Upgrading the suspension on your Toyota 4Runner is one of the most impactful modifications you can make for both on-road handling and off-road capability. Whether you’re tackling rocky trails, hauling heavy gear, or simply want a more planted feel on the highway, a properly engineered lift kit transforms the vehicle’s dynamics. This comprehensive guide focuses on installing components from two trusted aftermarket manufacturers: MetalTech and Toytec. By the end of this article, you’ll understand the benefits of a suspension lift, have a detailed part and tool list, and follow a step‑by‑step installation process that ensures safety and performance.

Why Upgrade Your Suspension with MetalTech and Toytec?

The 4Runner’s factory suspension is a compromise between comfort, cost, and capability. While adequate for daily driving, it lacks the articulation, damping control, and load‑handling needed for serious off‑roading or heavy loads. Upgrading with MetalTech and Toytec components addresses these shortcomings directly.

Improved Off‑Road Performance

MetalTech is known for its rugged fabrication and bolt‑on solutions that increase ground clearance and suspension travel. Their coilovers and control arms allow the 4Runner to flex more over obstacles, keeping tires planted for better traction. Toytec, on the other hand, offers premium coilover shocks and rear springs tuned specifically for the 4Runner’s weight distribution. Together, they create a system that absorbs large bumps and reduces body sway in uneven terrain.

Better On‑Road Handling

Lift kits often get a bad rap for ruining highway manners, but a well‑engineered setup does the opposite. MetalTech’s front upper control arms correct caster and camber after a lift, preventing the “wandering” feel. Toytec’s Bilstein‑based shocks provide firm yet compliant damping, reducing nose dive under braking and body roll in corners. The result is a vehicle that feels more stable and predictable at speed.

Increased Ground Clearance and Load Capacity

Adding a lift not only raises the frame for rock clearance but also allows for larger tires, further boosting capability. MetalTech’s rear springs can be paired with Toytec’s adjustable coilovers to handle heavy bumpers, winches, or camping gear without sagging. This is crucial for overlanding setups where weight fluctuates.

Aesthetics and Resale Value

Let’s be honest – a properly lifted 4Runner looks aggressive and purposeful. An aftermarket suspension from reputable brands enhances the vehicle’s stance without looking aftermarket or hackneyed. Moreover, a documented, quality lift often adds to resale value among enthusiasts.

Tools and Materials Needed

Before you begin, gather everything you need. Missing a tool midway can turn a weekend project into a multi‑day ordeal. Below is a comprehensive list, including specific recommendations for MetalTech and Toytec components.

Essential Tools

  • Floor jack and four heavy‑duty jack stands (6‑ton capacity). Never work under a vehicle supported only by a jack.
  • Socket set with both SAE and metric sizes. Common fasteners on the 4Runner are 10mm, 12mm, 14mm, 17mm, 19mm, and 21mm.
  • Torque wrench capable of at least 150 ft‑lb. Suspension bolts often require high torque values.
  • Wrenches (box‑end and ratcheting). A 15mm and 18mm are common for sway bar links.
  • Spring compressors (internal or external type). Essential for disassembling and reassembling coilover units.
  • Ball joint separator or pickle fork. Needed to separate tie rod ends and lower ball joints.
  • Breaker bar (24" or longer). Many OEM bolts will be rusted or torqued extremely tight.
  • Impact wrench (optional but highly recommended). Speeds up removal of large nuts and bolts.
  • Pry bar and dead‑blow hammer. Useful for aligning components.
  • Safety glasses and mechanic’s gloves. Suspension work involves sharp edges and flying debris.

MetalTech Components (Typical Kit)

  • Front upper control arms (tubular or boxed, with ball joints).
  • Front sway bar drop brackets and links.
  • Rear sway bar drop brackets (if included).
  • Brake line relocation brackets.
  • Hardware kit (grade 8 bolts, washers, nuts).

Toytec Components (Typical Kit)

  • Front coilover assemblies (e.g., Toytec Boss or Bilstein 5100 with springs).
  • Rear shocks (Bilstein 5100 or 5160 remote reservoir).
  • Rear coil springs (for lift height and load support).
  • Rear bump stop spacers.
  • Hardware and instructions.

Note: Exact part numbers vary by model year (2003‑2009 4th Gen, 2010‑2023 5th Gen, etc.). Always verify compatibility with your specific 4Runner before ordering. For reference, check MetalTech’s official site and Toytec’s product page for the latest kits.

Preparation and Safety

Working on suspension is inherently dangerous. The vehicle must be securely supported, and springs are under high tension. Follow these preparation steps closely:

  1. Park on a level, concrete surface. Engage the parking brake and chock the rear wheels.
  2. Disconnect the negative battery terminal to avoid any electrical shorts (some models have air suspension or ride‑height sensors).
  3. Remove any aftermarket skid plates or bumper guards that obstruct suspension access.
  4. Loosen the wheel lug nuts (do not remove) while the vehicle is still on the ground – this prevents the wheel from spinning.
  5. Lift the front or rear axle using the frame rails, then place jack stands under the frame crossmembers. Never place stands under the control arms.

Step‑by‑Step Installation Process

The installation is divided into front and rear sections. Tackle one end at a time to stay organized. Always refer to the specific manuals included with your MetalTech and Toytec kits, as torque values and fastener sizes vary slightly between generations.

Front Suspension Installation

1. Remove Front Wheels and Brake Calipers (Optional)

After safely lifting and supporting the front, remove the wheels. For easier access to the upper control arm nuts, you may also remove the brake calipers and hang them with a zip tie – do not let them dangle from the brake line.

2. Disconnect Sway Bar and Steering Components

Unbolt the front sway bar links from the lower control arm using a 14mm or 15mm socket. Then separate the tie rod end from the steering knuckle using a ball joint separator. You may also need to remove the front drive axles (on 4WD models) if you plan to lower the control arm fully – this is not always required but makes coilover removal easier.

3. Remove Factory Strut Assembly

On the upper control arm, remove the two nuts holding the top of the strut to the chassis. Support the lower control arm with a jack, then remove the lower strut bolt. Slowly lower the control arm to extract the strut assembly. Never force the strut out – if it is stuck, use a penetrating oil and a soft‑face mallet.

4. Install Toytec Front Coilovers

If you purchased pre‑assembled Toytec coilovers (recommended), the spring is already compressed and the top hat is installed. If you need to assemble them yourself, use spring compressors carefully – coil springs can store enormous energy. Mount the coilover in the original strut location, torquing the top nuts to the manufacturer’s specification (typically 20–25 ft‑lb) and the lower bolt to 120–150 ft‑lb (depending on the kit).

5. Install MetalTech Upper Control Arms

Remove the stock upper control arm (UCA). The new MetalTech UCA will have pre‑installed ball joints and bushings. Attach it to the chassis brackets using the provided bolts – do not fully torque them yet. Connect the ball joint to the steering knuckle, tightening the castle nut to 60–80 ft‑lb and inserting a new cotter pin.

MetalTech supplies drop brackets that lower the sway bar to restore its geometry. Install them using the provided hardware. Then reattach the sway bar links – the new links may be longer to accommodate the lift. Tighten all bolts to spec (usually 30–40 ft‑lb).

7. Brake Line and ABS Sensor Relocation

With increased suspension travel, factory brake lines can stretch or get pinched. Install MetalTech’s relocation brackets to secure the lines away from moving parts. Also check the ABS sensor wires – zip‑tie them to avoid contact with the control arms.

8. Torque Everything and Reassemble

Once all front components are loosely bolted in, use a jack to raise the lower control arm so the vehicle’s weight is on the suspension (but the jack stand still supports the frame). Now torque all bolts to the final values specified in your kit manuals. Common torque values: UCA chassis bolts 70–90 ft‑lb, sway bar link nuts 30–40 ft‑lb, tie rod nut 40–50 ft‑lb. Reinstall the wheels and hand‑tighten the lugs.

Rear Suspension Installation

1. Lift and Support the Rear Axle

Support the rear axle with a floor jack, then place jack stands under the frame rails forward of the leaf spring shackles. Never support the axle only on the differential – it can tip. Remove the rear wheels.

2. Remove Factory Rear Shocks

The stock rear shocks are typically mounted with a bolt at the top (inside the frame) and a lower bolt on the axle. Use a 17mm or 19mm socket. They may be rusted; apply penetrating oil and use a breaker bar. Once loose, remove the shocks completely.

3. Remove Factory Rear Springs

Lower the axle carefully until the stock coil springs are free. If they are under tension, use a spring compressor to safely release them. On 5th Gen 4Runners, the rear springs are captured – you may need to unclip the lower isolator to free them.

4. Install Toytec Rear Springs and Bump Stop Spacers

Place the new Toytec springs (often heavier rate for lift and load capacity) onto the axle perch. Install the provided bump stop spacers (block of polyurethane that prevents the axle from bottoming out against the frame). Raise the axle gently with the jack to seat the springs, ensuring the top isolator is properly aligned.

5. Install Toytec Rear Shocks

Bilstein 5100 or 5160 shocks are common in Toytec kits. Extend the shock fully and attach the upper mounting bolt loosely. Then lower the jack slightly to align the lower shock eye with the axle bracket. Torque the bolts to 70–90 ft‑lb (check the manual). If you have remote reservoir shocks, mount the reservoirs on the frame using the supplied clamps.

6. Install MetalTech Rear Sway Bar Drop Brackets (If Included)

Some 4Runner models have a rear sway bar, and MetalTech offers drop brackets to maintain proper bar angle. Install them per the instructions – this step eliminates excessive body roll during cornering.

7. Final Torque and Wheel Installation

With the axle resting on its new springs and the shocks connected, torque the upper and lower shock bolts. Reinstall the rear wheels and lower the vehicle to the ground. Do not torque the lug nuts fully until the vehicle is on the ground.

Post‑Installation Checks

After completing the lift, perform a thorough inspection before your first drive. Skipping this step can lead to loose components, poor handling, or even accidents.

  • Torque verification: Recheck every nut and bolt on the suspension, especially after the vehicle has been driven a few miles. MetalTech and Toytec both recommend a re‑torque after 50–100 miles.
  • Alignment: A lift changes camber, caster, and toe. Drive the vehicle to a shop that specializes in off‑road alignment. Expect to pay extra if they need to adjust aftermarket UCAs (which often have adjustment cams). For factory UCAs, alignment may still be possible within limits, but MetalTech arms allow full adjustment back to spec. This forum post provides typical alignment specs for lifted 4Runners.
  • Brake line clearance: Turn the steering fully left and right, and cycle the suspension up and down to ensure brake lines and ABS wires don’t pull tight or rub.
  • Headlight aim: With the vehicle lifted, headlights may point too high. Adjust the beam downward using the screws on the back of the housing to avoid blinding oncoming traffic.
  • Test drive: Take a slow, cautious drive around the neighborhood. Listen for clunks, squeaks, or rattles. Then progress to highway speeds and evaluate steering response, brake dive, and rebound control. If any component feels loose, pull over and re‑torque.

Maintenance Tips for Long‑Term Performance

Your new MetalTech and Toytec suspension will last many years with proper care. Here are a few maintenance recommendations:

  • Clean and inspect after off‑road trips. Mud and sand can accelerate bushing wear and rusting of coilover threads.
  • Re‑torque suspension bolts annually. Vibration and thermal cycling can loosen fasteners over time.
  • Lubricate ball joints and sway bar links. MetalTech arms often have grease fittings – use a grease gun with quality chassis grease every oil change.
  • Monitor shock performance. If you notice excessive bounce or fluid leakage, replace the shocks. Bilstein units are rebuildable by many specialty shops.
  • Check for rubbing. After installing larger tires, trim any plastic fender liners or pinch welds that contact the tires during full turn or articulation.

Conclusion

Upgrading your 4Runner with MetalTech and Toytec suspension components delivers a dramatic improvement in handling, ground clearance, and overall driving pleasure. The process is straightforward for an experienced DIYer, but it demands patience, the right tools, and strict attention to torque specs and safety. By following this guide, you can confidently transform your 4Runner into a more capable and comfortable vehicle both on pavement and in the backcountry. For additional support, consult the official installation videos from MetalTech's YouTube channel or the Toyota 4Runner forums – the community is full of helpful owners who have completed the same upgrade.