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NA-NB Polyurethane differential bushings

NA-NB Polyurethane differential bushings

Regular price $100.00 USD
Regular price $125.00 USD Sale price $100.00 USD
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The differential is mounted in the car with some surprisingly flexible rubber bushings. Replacing these with stiffer SuperPro polyurethane bushings will cut down on differential movement, which actually makes your shifting more precise due to the way the Miata's drivetrain is mounted. There's a noticeable increase in vibration, so be prepared for that. For street cars, the poly inserts or Mazda Competition rubber mounts are probably a better idea. A definite plus for competition cars - you don't want to hit 5th instead of 3rd in the heat of competition!

Bushings fit 1990-2005 only.


Instructions are not currently available.


Ships free in the US.

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What does it fit?


Emissions do not apply.





Customer Reviews

Based on 4 reviews
Russell M.
A note about the installation

If you shop these against other poly diff bushes, one big thing to consider is that you do not need to modify the lower diff mounts by removing the rubber. The ring at the bottom is designed to fit between the rubber teeth on the lower mount and the central dome.

Subtracted a star because I searched all over and wasn't able to find that information anywhere. I was told these "should" work ok without the rubber on the bottom. I'll run that and see, may add new lower mounts later.


Great bushings absolutely improved the handling and ride of the car

Cole J.
Great NVH balance

Energy that is not lost to flexing the differential on its mounts, is more energy to the ground, and with low horsepower cars, it becomes critical. These fit perfect in the factory mounts, and great deviation in color from traditional black or red. I am unsure what durometer they chose, but it seems to strike a delicate between flex and NVH into the chassis.

Worth the effort to install it.

If you’ve ever tried to do a launch and the only thing that moved was your shifter, you need this. On a 28 year old car, the difference is night and day when it comes to the firmness of the entire vehicle. The acceleration becomes smooth and the whee hop is reduced to almost none.