08 TL AT with 115k on the odo. I'm noticing a rough downshift from 5th to 4th and 4th to 3rd. You can feel the car slow quickly and lurch forward when these shifts happen. All other downshifts are smooth as butter. ATF fluid is fresh, 3rd gear pressure switch is new & recently replaced the front upper tranny mount.

Any suggestions on where to look first? My ideas were as follows.

• Other trans & motor mounts
• 4th gear pressure switches

 

Reset the computer.

 

Pressure switches