I've noticed that when I am in moderate to heavy acceleration, I can feel vibration in my clutch when I push it in to shift. It feels like engine vibration coming into the clutch as a result of the moderate to heavy acceleration. It doesn't do this all the time. I don't feel this when I accelerate slowly/easily like grandma.
After I noticed this was happening, I was on an exit ramp, put it in neutral, held the clutch in and rev'd the engine and I could feel the vibration then too. I'm not sure why it's doing this, but it just started in the last couple days.
Doesn't feel like slipping since when I push it hard, the car accelerates fine, then when I go to shift into 3rd, I feel the "engine vibration" in the clutch.
Anyone have any ideas as to why it might be doing this? Anyone felt this before?

Thanks in advance!

 

have you gotten the 3rd gear fix yet? I would check your motor mounts and transmission mounts too.

 

I never had the third gear problem. I did already put the GM tranny fluid in as a preventative measure though. You think bad motor or tranny mounts could cause this?