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Old 04-16-2002, 07:36 PM   #1
Karl
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Default Transmission/differential drain/fill plug sizes

I know I can use the search, and honestly I have tried. But I come up with tons of posts and they all talk about something else without mentioning sizes. I am sure some of you have done this so what are the sizes for these plugs? I plan on changing the fluid next week, and hope to get what I need before starting. I already have 22mm, 23mm, and 24mm sockets (these are the sizes of the plugs on my Miata). Anything else I may need?
While I am at it, what brand of fluid and what grade do you use? I use MT90 in the Miata transmission (but it is only GL4 rated) . Should I use 75w90 NS in the transmission, and 75w90 in the differential? Opinions??
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Old 04-16-2002, 07:55 PM   #2
paultg
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I *think* the plugs are just an insert for a 3/8 drive ratchet (no socket required). They are very easy to see on the back of the diff. I would just crawl under there and check, that way you'll be sure.

The fluid info should be in the owners manual. I can't remember off hand what the fluid viscosities are. Don't forget the rear diff. is an LSD too.

Hope this helped.

Paul G.
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Old 04-16-2002, 08:40 PM   #3
North Ursalia
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Old 04-16-2002, 09:40 PM   #4
Karl
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Hey those are good webpages.... exactly what I was looking for.
You know, it would be nice if there is some kind of faq, consolidating all these info into easy to find entries.
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Old 04-16-2002, 10:07 PM   #5
scurry
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I just replaced both my tranny and diff fluid two weeks ago with Redline. I was very surprised to find how black the oil was in both the tranny and diff. This is with only 6K miles on the car. Has anyone else experience this? I do autocross but I cant see this being the cause of the discoloration. The magnetic plugs did have some sludge on them but no major chunks. I just contribute this to normal break-in. I recently changed the clutch in my 91 MR2 (required draining tranny) and the redline tranny fluid was just as red as it was 14K miles ago.

Shawn
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Old 04-16-2002, 11:23 PM   #6
kpratte
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Quote:
Originally posted by paultg
[b]I *think* the plugs are just an insert for a 3/8 drive ratchet (no socket required).
actually 1/2" drive ratchet..

Oh, and the fluid smells nasty!

- Ken
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