This is a quick and simple instruction on how to flush a manual transmission on a miata. First warm up the gear oil in your transmission, so all that crud build up will come out with the oil when you flush it. I went out and drove the car for a little bit on the freeway,got something at the store and came right back to my garage.
To get started:
1. Jack up your front driver side and locate the two main plugs to get the job done. The plug to pump the oil in will be on the driver side, its a square bolt and you can use an open end wrench to remove it.It is facing sideways before the bell housing. The second plug to drain the gear oil is located at the bottom of the transmission, if I remember you use a 24mm socket.However, I had every tool but a 24mm socket,so I used an open end wrench. Here is a couple of pictures that will give you the exact location.
I left the wrench hanging so you can see the location of the side plug in conjunction with the 24mm drain plug:
This is another picture without the wrench:
This is the 24mm drain plug:
This is a picture of the oil draining:
I used a universal hand pump that you can buy at the local parts store. I used walmart super tech 75w90 synthetic blend. I paid about $12 for 2 quarts. Just pump the oil in after you drain the old one.
After everything was done, I drove the car right away. My miata already shifted nice even before the flush. My miata actually shifted smoother than any of my Mr2's that I had in the past,even after my mr2's had their trannies flushed. But this time my miata now shifts even smoother and lighter. Now I know what they mean when they say "it shifts like hot knife through a butter". I bought my car with 128k, now it has 160k and I don't know when the last time the gear oil was replaced. The way my transmission shifts, I definitely got a deal out of that walmart oil. Thank you for reading.
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Originally Posted by iKhanh
