When I yank the dipstick on my TH400 while its idling, in neutral, I get a bubbly covering an inch or so up the stick's "full" level. I never get a good, crisp reading of pure liquid coating. Is the fluid splashing up on the stick, or is it too full and getting aerated?

When it is hot but the engine is shut off, the fluid goes to just a tiny bit above where the stick spits and re-joins making that little window.

How do I accurately determine if the trans has the right amount?

gibbons, check it in park,engine running,on level ground.

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Leo Paugh
Maryland Chevelle Club #017

I had the same thing happen to me with a TH350. Never figured out why. It always ran fine, no problems.