中文版:Project Miata – 换挡杆维护 – Frank’s Weblog
Recently I found the shifter is very stiff on my Miata, and shifter has a lot of play no matter in neutral or in gear. I realized the shifter needs some care.
I bought a shifter rebuild kit from Treasure Coast Miata: New OEM ’90 – ’05 5 speed Shifter Full Maintenance Kit
Besides the items in the kit, you’ll need:
- 75W-90 Gear oil*
- A turkey baster of syringe to extract old oil from turret
- Shifter boot leather(not included in the kit)
Scarlett: Both the manual transmission and the differential takes 75W-90 gear oil. However, the differential requires GL5 while transmission requires GL4. You can use either GL4 or GL5 in the turret.
I didn’t expect the existing parts to be in a good condition, but I was still surprised when I revealed the shifter parts. A good amount of rubber on the upper shifter boot has completely gone. Most likely the shifter was never serviced before.
![](https://blog-assets.nyan.im/img/2023/12/IMG_0489.jpg!s)
Look how much play is there!
When I pull out the shifter stick I immediately noticed something is wrong — where is the bushing?
![](https://blog-assets.nyan.im/img/2023/12/IMG_0491.jpg!s)
Remove the old oil with syringe or turkey baster.
![](https://blog-assets.nyan.im/img/2023/12/IMG_0495.jpg!s)
The OEM plastic bushing is already broken into pieces. I managed to fish them out.
![](https://blog-assets.nyan.im/img/2023/12/IMG_0494.jpg?width=1280)
Remove the old parts from the shifter stick, re-assemble the shifter stick with new parts, following this diagram. On my shifter the half moon bushing was broken and one of the pieces were stuck in the shifter. I ended up drilling it out.
![](https://blog-assets.nyan.im/img/2023/12/NA0-7629-3__05601.jpg)
![Project Miata – 换挡杆维护 Project Miata – 换挡杆维护](https://blog-assets.nyan.im/img/2023/12/IMG_0496.jpg!s)
There are one bushing and one washer in the turret, replace them with new parts, fill the turret with oil. It takes 3oz(around 90ml) I used Valvoline 75W-90 GL5 gear oil(same as differential). Put the shifter stick back in.
Shifting is much more better.
Reinstall the upper shift boot.
![](https://blog-assets.nyan.im/img/2023/12/IMG_0502.png!s)
Put everything back together, and enjoy.
![](https://blog-assets.nyan.im/img/2023/12/IMG_0518.jpg!s)
If you want to know more about how manual transmission works, watch this:
Manual Transmission Operation – YouTube
一次性拆解完:手动变速箱原理探秘 Manual transmission explained – YouTube
More about Project Miata
Project Board: https://github.com/users/frankgx97/projects/3/views/1
Issue: https://github.com/frankgx97/project-miata/issues/15
Related Posts
References
Mazda Miata MX5 1990-1997 Gear Shift “Dust Boot” Replacement & Gear Shift Turret Oil. – YouTube
Part 1 Miata MX5 Transmission Shift Turret Insulator Service – YouTube
Project Miata The Answer Episode 4: Shifter rebuild – YouTube
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