I've been having this problem. Sometimes when shifting into 5th gear I get a grinding sound and feeling through the shifter. I have about 139000 on the car and just had the tranny fluid replaced about 2 weeks ago. I dont remember if this was happening before or after the change. But I think after. And yes when I shift the clutch is all the way to the floor and I dont try and shift fast. Its seems once the rmps come down a little it will shift smooth most of the time. Has this happened to anyone else and does anyone have a recomendation?