When my car is cold or even just cooled down for an hour there is a new vibrational sound just before upshift from 1st/2nd, 2nd/3rd, and 3rd/4th. If I keep speed I can draw that sound out til either upshift or slow down. I recently had an atf change at 210k by my mechanic of 20 years. He has done all the maintenance on car (5k oil/filter changes, brakes whenever needed, etc). This is the 2nd atf change he's done for me (the other at 100k and no complaint then). This change was premium, sucking most of the fluid out thru the top, replacing with top quality atf (but not Toyota's as I had specified 1st time but not this time).When I brought this to his attention he thought that it had more to do with mileage on trans, using new clean atf when it expected dirty state, and the wear and tear of tran's age. After seeing so many items about the Toyota atf specifications in these forums, no matter how high quality atf was used that it might not exactly match Toyota atf, and is that the cause of the vibration?