otherwise runs fine has been getting more pronounced over the last few week
eases up in neutral. have been doing the 4 qt atf drain and replace no difference.
reminds me of a presure relief valve releasing and closing and setting up a resonance.any ideas ? car has 190k

Bad motor mount?

My first idea is that your "4 qt atf drain and replace" is bad practice.

The pan only holds about 2.5 quarts. So perhaps you've been overfilling the transmission by 1.5 quarts every time you do this. Considering that the transmission only holds about 8 quarts, you may be overfilling the transmission by almost 20%. This is a case where "more is NOT better".

You really should use the dipstick as your guide for how much to fill the transmission.

All good places to start.
Fluid level is right between the marks, I put 4 in because 4 came out of drain
can not find a pan in the traditional sense.
I am exploring motor mount or exhaust hitting
good potential
thanks

Unless you park on an incline without the Ebrake set, there should be no difference between P or N. If there is an incline, check the motor mounts and tranny mount.

What are the rpms at idle? Are the spark plugs in good shape? Too black is an indication that there might be a vacuum leak.

Klaus
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Did you do your Random Act of Kindness today?

idles about 900 steady
performance is fine
this is a shake you feel through the car
and see in the wheel
thanks

If it is shaking that badly, you might have a bad coil.
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Did you do your Random Act of Kindness today?