Does the shudder happen only when you're in Park, or does it happen when you're driving as well?

 

It happens in park at 2500 rpm and while iam driving it gets worst at higher speeds.....I took it to a shop today they are also baffled. He seperated the torque converter from the flywheel and it got quieter but still vibration was there. I hate to just put a flywheel and torque converter in and still be with the shudder-vibration.

 

yep you are decribing the same thing i was feeling. right after i changed the trans mount i thought at first the motor or trany was wack. that was when i first found this site. i was reading on here for three days and seen about how the poly trans mount could do that. i thought man could it be that easy. figured it was worth a try. i think it was 18 bucks for the stock mount. took about 20 min. to change. im not sure thats what your problem is but it might be worth a try.