Transmission Drain Plug Size (internet seems to be wrong)
 

I'm trying to replace my drain and fill plugs with AN fittings to for a trans cooler. I looked up the thread size and I can see multiple sites claiming its M18 1.5 but that is too small and the incorrect threads. The fitting on my transmission are tappered threads. Anyone know the correct size?

:cheers:

I posted too soon, they're M24 X 1.5. Or at least I think they are. they're tapered though which is a problem, I can't seem to find M24 X 1.5 tappered threads to AN. Surely someone has solved this problem..right?

When i had mine out it appeared to be regular 1/2" NPT. I didn't test, so not positive.

Yup: A welder.

There's an aftermarket kit for transmission cooler made by tunermotorsports. Maybe try to contact them to see where they source the fittings?

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I actually just went through this this week. Yes, it is an M24x1.5 tapered thread.

I couldn't find any off- the- shelf fittings that would work without adding too much of a "hang-down". ;-)

I went to my local Bridgestone hose products store, where their genius in the back built me a fitting.

He drilled the plug, and then welded in an NPT fitting. From there, I actually added a Tee, so that I could also plumb a temp Gauge.



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Try British American Thermal in Fla. they have many fittings.
https://www.batinc.net/plumbing

If you haven't installed them yet, can you take pics?

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I'm sorry, i installed it same day. But I'll see if I can snap a pic with it in place. (Unfortunately, I already put the stressed- member plate back on as well)

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