NA-NB Stabilizer Bar Bushings

Original Author: Phil Barnett (prb) - 2013

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I recently changed out my Stabilizer Bar bushings due to one of them in the rear deteriorating. What happened was that the ridge of rubber that holds the bushing in place had torn loose and the bushing slid sideways on the bar to escape the bracket. I put it back in place but it only stayed in place for a few months. I needed to replace the torn one. I figured if one of them was in that bad of shape, the others could not be far behind. (actually, the others looked OK after I got them out)

The replacements I ordered were stock replacements from Beck-Arnley and were part numbers 101-6384 (front) and 101-6523 (rear) and were under $25 shipped from Amazon suppliers. If you don't have Amazon Prime, it's probably less expensive to source these from a dealer or local auto parts store. Beck-Arnley parts are available from a lot of local suppliers. There are other brands that would be just as good, and Miata dealers also carry these bushings at competitive prices. Other owners used Moog parts:

Front NA sway bar bushing Moog K90644 fits 1990 - 1997
Rear NA sway bar bushing Moog K90643 fits 1993 - 2005

To do the work, you'll need a way to get the car off the ground. Ramps are perfect for this. You need to raise the end of the car you are working on evenly if you use a jack. You can't lift one tire at a time for this job. You'll need a 12mm socket and it helps to have a 6" or longer extension on the socket for the front bushing plates. It took a fair amount of torque to break the two nuts loose from the bushing plates after sitting for 20 years. Once off, I removed the old rubber part, placed the new rubber part in the same position, slid the bushing plate back over them, tightened and torqued the nuts. Two in front, two in back.

I found a noticeable difference in handling. I believe everyone with 20 year old deteriorated and softening bushings will notice the difference. Before the swap of these bushings, the car would "set up" into the corners. In other words, as the car started to lean in the corners, some slack was taken up with a quick portion of lean and then the stabilizer bars got into the picture. That slack is now gone.

For as little as these cost and as easy as they are to replace, there's no reason to not have new ones on your car. Of course, ultimately you'll need a great alignment to get the best out of your cornering, but these bushings won't make your alignment different, for better or worse. These will introduce no alignment changes. Just less slack in the suspension, better cornering.

After thinking about this for a few days, I'm going to call this the best $25 I have spent on my car.

ItemSAE (ft lbs default)Newton/Meters
NA Stabilizer Bushing Plate14-1918-26