Rough downshift and slippage after slowing from 2 hour interstate drive, 2002 Acura TL. No indicator trouble lights on dash. Acura repair shop found no trouble codes with their equipment. No problem with other gears. Car has 103K miles and problem started after 100K mile service which included 3 quart ATF "flush". Only recommendation thus far is "replace transmission" despite no trouble codes being found. Any advice?

 

Sounds like the most common issue our car faces. From the looks of it your transmission is on its way out.
Where did you take the car to get its transmission flushed? That procedure is the starting point of tranny failure for a LOT of people. Our transmission doesn't seem to like that.
If you search around on this forum, you'll find a few really good threads on the transmission issue.

 

This worked for me. It is up to you try it or not. https://acurazine.com/forums/second-...mprove-950615/

 

103kmiles is pretty low these days for 2g tl's does it still have the original transmission? If so you might have to prepare looking into a rebuild or swap sometime in the near future sadly.

 

Flush is a *NO* for these cars. I would verify that they used Honda DW-1 as replacement for the fluid.

Also, if they only exchanged 3 quarts with the flush then they did not replace all old fluid.

Let us know what the condition of the fluid is when you do the drain and fill with new fluid.

Also, pay attention to the RPMs at freeway speed - at 70MPH my RPM is just a hair under 2,000. If it's higher than that then it's a potential sign your torque converter is dying.