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check the manual for the lexus ES300. Should have the A540 trans manual in there.
If there is too much fluid in the pan, it can foam up the fluid and affect your shifts possibly. You should see bubbles on the dip stick I would think though.
Yes you do have to drop the pan and the valve body to change out the solenoids.
It's not all that difficult, but there are a lot of steps you need to go thru and parts to take off. Just study the steps carefully, take your time ( all day), make sure your area is clean and store the parts removed in foil or something else. Get a decent 1/4" or 3/8" torque wrench too.
ag6286, I still think a shift solenoid is a long shot. The A541E has a throttle pressure solenoid but the A540 does not. That's one of the major differences. The SL solenoid I think is the one you were referring to. One other thing it could be though is a clogged intake filter/screen on the bottom of the valve body. Have a close look at that when you drop the pan. It's always a good idea to replace that, the pan gasket, and to clean the magnets in the pan while you are in there.
dave mc
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