SkidNation MX-5 NA Rear Traction Foundation Kit

The NA chassis is celebrated for its lightweight, “tossable” nature, but that agility can quickly turn into instability when the rear suspension geometry starts acting on its own. After decades of service, the factory rubber bushings in the rear control arms have softened, allowing the rear wheels to “steer” the car under load. This results in a vague rear end that feels like it’s squirming during hard cornering or “stepping out” unpredictably.

We’ve curated the Rear Traction Foundation Kit to anchor the rear of your NA. By replacing the high-deflection rubber with polyurethane and adding our unique alignment locking system, we ensure that once you set your toe and camber, they stay exactly where they belong – no matter how hard you clip a rumble strip or launch from a standstill.

SkidNation MX-5 NA Rear Traction Foundation Kit

What’s inside the kit:

• Rear Axle Polyurethane Bush Kit – A complete set for the rear upper and lower control arms.
  • Geometric Stability: Replaces the “mushy” factory rubber to keep the rear wheels parallel and pointed where you intend.
  • Stiffness Options: Choose 80 ShA for a street-focused build that maintains civility, or 90 ShA for a track-focused machine where mechanical precision is the priority.
  • Pro Tip: This kit targets the rear “knuckle” and arm pivot points, which are the primary culprits for mid-corner “rear-steer.”

• High-Strength Rear Alignment Bolts – A full set of eight 10.9 grade eccentric bolts.
  • Precision Adjustment: Designed to provide smooth, incremental changes to your alignment without the “binding” common in old, rusted hardware.
  • Durability: High-tensile steel construction ensures they won’t stretch or deform under the stresses of spirited driving.
  • Why it’s here: You cannot have a high-performance alignment if your adjustment hardware is seized or rounded.

• SkidNation Alignment Locks – 4 mm zinc-plated steel plates that physically lock the eccentric bolt in place.
  • Zero Slip: These plates eliminate the possibility of the eccentric bolt rotating—a common issue when hitting curbs or mid-corner bumps.
  • Two Variations: We include the H-shape version specifically designed for our SkidNation high-strength bolts, and the D-shape version for users still utilizing OEM-style hardware.
  • Pro Tip: This is the “set and forget” solution for anyone tired of their alignment “walking” after a single track day.

Key benefits

• Locked-In Geometry: Your alignment stays true even under the most aggressive driving conditions.
• Predictable Breakaway: Eliminates the “snap” oversteer caused by dynamic toe changes, making the car much easier to catch at the limit.
• Sharper Throttle Steering: With the rear end stabilized, you can use the throttle to rotate the car with far more precision.
• Corrosion Resistance: Zinc-plated hardware ensures that your suspension remains adjustable for years to come.
• Peace of Mind: No more second-guessing your setup after a heavy session on the track.

This kit is for you if:

• You’ve noticed the rear of your NA feels “loose” or “squirmy” under heavy lateral load.
• You frequently drive on track or bumpy backroads and find your alignment “slips” out of spec.
• You are performing a full rear-end refresh and want a solution that is significantly more durable than factory parts.

This kit is NOT for you if:

• You want a soft, “OEM” ride: Polyurethane bushings (especially in 90 ShA) transmit more road vibration and mechanical noise than the original rubber.
• You never push the car: If you only use your MX-5 for slow Sunday cruises, the locking plates might be overkill for your needs.

Fits all 1989-1997 models – NA (Mk1).

Shipping worldwide.