I've been getting a strange vibration in low rpm, 2nd gear. The car is an 02 OBW/ 2.5/ auto, 145k mi. The fluid was changed (whatever the drain plug will let out) at 137k along with the filter. Is this a torque converter on the way out? I noticed it a couple of months ago, leaving work. I thought it was a rough patch in the road, as it happens in the same place everyday (about 1.5 mi. out). Then, I started noticing it in other places, which leads me to question the trans. I also have a slightly delayed engagement from reverse/ park to forward. There are no idiot lights on the dash, and everything else seems to work. I am just wondering if I should be concerned and look for a lower mileage trans. or, throw a bottle of Trans-X in and let'er eat.

typically a converter will chatter at the high rpm point just before the trans shifts up. Vibrations can come from anywhere in the driveline.