Polyurethane Differential Bushing Insert Kit for NA and NB
Polyurethane Differential Bushing Insert Kit for NA and NB
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Description
The differential is mounted in the car with some surprisingly flexible rubber bushings. Replacing these with stiffer bushings will cut down on differential movement, but they're a headache to install. Looking for an easy answer? Enter these bushing inserts. These inserts, made by SuperPro, fill in the voids in the stock bushings to minimize the movement of the differential - this actually makes your shifting more precise due to the way the Miata's drivetrain is mounted. They're a pretty easy install, as you just have to lower the differential enough to get it off the studs in the subframe, slip the smaller part into place, then put the bottom piece in place. With full replacement bushings, you need to remove the differential altogether then remove the stock bushings (which typically requires fire. Seriously.). A definite plus for competition cars - you don't want to hit 5th instead of 3rd in the heat of competition!
Bushing inserts fit 1990-2005 only.
Instructions
Shipping
What does it fit?
Emissions
Emissions do not apply.
Warranty
lifetime
SKU
Pretty easy installation, I had to remove the diff main stud nuts, lower bushing mount, rear section of exhaust, and rear subframe brace - 2 hour install. Signficantly improved driving experience, not overly harsh either. Actually, I barely noticed any vibrations or roughness. Adds a good big of rigidity to the driveline. Well worth it.
these are grrrreat!! fast & easy install!!
This reduced the excessive play in the drive train and seems to make the car feel more planted.
I am very happy with the results of installing this easy to install bushing insert kit. The car just feels more settled to me. Great value for little money.
I installed these over the weekend. Installation was 3/10. Had to drop rear tie and FM butterfly bracing and undo the muffler from the midpipe (I have the FM Catback) to give enough flex to the unbolted differential housing to be able to slip the poly doughnut rings (top part of the insert) into their intended locations. Of course, unbolting everything took longer than installing the parts.
Driving impressions are positive. No detectable NVH and more precise shifting. 1-2 and 2-3 are the most noticeable. Downshifting through all the gears feels tighter with much less bounce (when not done perfectly).
I'm a very satisfied customer.