'03 CL-S 125K miles on it, the problem is that on the highway going 60 mph or so if you give it a little gas the car shakes. Going down hill it doesn't, but on a level section or up hill it shakes. You can feel it in the seat. Car runs perfectly in every sense otherwise. Just did the tranny 3 X 3 quart change with Honda fluid too, no better. Fluid has always been kept clean btw. Is my tranny going out? Thanks.