Mazda Miata 94-05 Differential Housing Reinforcement Brace Plate Aluminum 1.8

Miata Differential Brace Plates (1994–2005 1.8L) – Weld-In Reinforcement Kit

Fits all 1.8L Miata differentials from 1994–2005 (NA/NB).
Spec Miata Legal | 3/16" Aluminum

Upgrade your Miata’s rear end with our precision-cut weld-in differential brace plates, engineered to reinforce the factory housing and eliminate a critical failure point that can end your race—or your drive.

Why You Need This Brace

Mazda designed the 1.8L Miata differential housing with a relief notch on the passenger side. Under street conditions, this notch is meant to crack in a collision to protect other drivetrain components. But in racing or spirited driving, that notch can become a serious liability, leading to unexpected failures from:

• Hard shifts

• Track bumps

• Drafting & bumper contact

• Normal wear under load

Even without an impact, we've seen this housing crack mid-race— As seen in photo 2

Product Details:

• Fits: All 1994–2005 1.8L Miata differential housings (NA & NB)

• Material: 3/16" aluminum

• Design: Weld-in reinforcement plates – designed to cover and strengthen both the passenger-side weak point and optionally the driver-side as well ( order quantity 2 if you're reinforcing the driver side)

• Use Case: Track, Spec Miata, street builds, time attack, autocross

• Spec Miata Legal

Protect your diff before it breaks.

If you're racing, pushing your car hard, or simply want peace of mind—this is one of the smartest investments you can make in your Miata's long-term reliability.