Anybopdy tell me what the oil capacity of a M21 close ratio 4 speed is. I got about a quart and a half in it and it won't take any more 80-90w. Is that all it takes?

I think that's pretty close. I just installed and filled mine a couple months ago. It took about a bottle and a half..... so I think you're good. :)

If you're really concerned about ti, take it for a spin and check it again later. As long as you can dip your finger and touch oil through the fill hole, it's full enough.

chris

I fill it up until I see it push out of the fill hole. I usually use a short allen wrench, fill it up, stick the small bent side of the allen wrench in the fill hole and if that sucker gets trans fluis on it I know I am less than a half inch below the fill hole and then I button it back up.