If you own a Toyota 4Runner (USA) from the late-’90s / early-2000s — chassis codes RZN180, RZN185, VZN180, VZN185 (1995.11–2002.08) — you know these trucks are built to last. They’ve earned a reputation for rugged reliability, strong value retention, and a willingness to be worked on by home mechanics and pros alike. Still, steering components are wear items: time, road salt, and heavy use will eventually show up as play, noise, or leaks in the rack area. When that happens, replacing worn bushings and pads with high-quality polyurethane (PU) parts is one of the most effective durability and performance upgrades you can do.
Below is a professional guide explaining the relevant model coverage, what to watch for, and why our PU steering rack components are the recommended replacement.
Model coverage
This post applies to steering racks fitted to these U.S. 4Runner variants, model years 1995.11–2002.08:
- TOYOTA 4RUNNER (USA) – RZN180
- TOYOTA 4RUNNER (USA) – RZN185
- TOYOTA 4RUNNER (USA) – VZN180
- TOYOTA 4RUNNER (USA) – VZN185
These chassis codes cover common 4Runner trims and drivetrain configurations from that generation. If you are uncertain about fitment for your truck, verify the part fitment using your VIN or the OEM reference before purchasing.
Signs your steering rack—or its mountings—needs attention
Wear or failure of steering rack bushings and pads often presents with clear symptoms. If you notice any of the following, inspect the steering rack mounting bushings and pads immediately:
- Excessive steering play or a vague/loose feeling at the wheel
- Clunking or knocking noises when going over bumps or during steering inputs
- Steering wander or the vehicle pulling to one side
- Uneven or rapid tire wear that can indicate geometry changes under load
- Visible deterioration of rubber bushings (cracks, tears, flattening) or pad material
- Hydraulic fluid leaks around the rack (if your model uses a hydraulic steering rack) — although leaks are rack issues, worn supports accelerate problems
Any of these signs can mean the steering rack is not being held securely. Even if the rack itself is in good condition, worn bushings and pads let the rack move under load, degrading steering precision and increasing wear on other components.
Replacement parts we offer (durable, performance-oriented)
To restore tight steering and extend service life, we offer polyurethane replacements specifically chosen for durability and improved control:
- PART #: 1-20-172 — Polyurethane steering rack bushing set (2 pcs)
Designed to replace factory rubber bushings that support the steering rack. Sold as a set of two to replace both sides where applicable. - PART #: 1-12-198 — Polyurethane pad
Replacement pad to restore the rack mounting interface and eliminate excess movement.
Both parts are manufactured from high-grade polyurethane formulated for automotive suspension and steering use. We include grease with every product to aid installation and minimize squeak.
Why choose polyurethane instead of rubber?
Polyurethane replacement parts offer several practical advantages over the original rubber components:
- Longer service life — PU resists oil, road salts, heat, and ozone far better than rubber, so it retains shape and strength for many more miles.
- Improved stability & reduced deflection — PU is firmer than rubber, which reduces unwanted movement of the steering rack during cornering, acceleration, and braking. That means a crisper, more predictable steering response.
- Better wear resistance — Polyurethane resists abrasion and compression set, maintaining consistent performance under load.
- Ideal for performance and load-carrying use — If you tow, carry heavy loads, or drive off-road, PU parts are more likely to withstand the extra stresses without failing prematurely.
- Often simpler for DIY replacement — Many PU bushings feature split or floating designs that make replacement more straightforward than removing vulcanized rubber sleeves.
Trade-off: Because PU is firmer, some drivers notice slightly more chassis vibration and increased steering feel at low speeds or idle. For most owners this trade-off is acceptable — and even desirable — because it translates to better control and feedback on the road.
Installation & maintenance notes (best practice)
To ensure the new PU parts perform as intended and provide the longest service life:
- Verify fitment first — confirm the part number and compatibility for your specific 4Runner using OEM references or VIN.
- Thoroughly clean the mounting area — remove every trace of the old rubber and any corrosion or debris from the rack housing and mounting points. Leftover rubber can prevent seating and cause premature failure.
- Use the included grease — apply silicone-based grease or the supplied lubricant to mating surfaces to ease installation and prevent squeaks. Avoid petroleum-based greases that can attack some elastomers.
- Use correct tools — press the bushings into place using a press or the proper installation tools. Avoid hammering or forcing parts by hand, which can cause misalignment or damage.
- Check alignment — after reassembly, have the vehicle’s front alignment checked and corrected if necessary; replacing rack supports can change toe/caster slightly.
- Inspect periodically — check the new PU parts for secure fit and any signs of abnormal wear during routine maintenance.
For owners of the 1995.11–2002.08 Toyota 4Runner, replacing worn steering rack bushings and pads with polyurethane replacements is a cost-effective upgrade that restores steering precision, reduces unwanted rack movement, and extends the time between service interventions. Whether you’re preserving a daily driver or building a capable off-road rig, PU steering rack mounts deliver measurable, long-term benefits.
Find these parts and detailed installation guidance at durable.parts — and if you’d like, we can help confirm fitment for your VIN.