[yepp619]

I have a 95 s14 and whenever I accelerate in any gear there is a crazy vibration around 3k rpm no matter what gear I'm in but as soon as it gets to about 4k rpm it starts to go away.. any gear, Any speed, and it feels like it's coming from the trans/driveshaft because the shifter will shake violently. Car used to be automatic but it just recently started doing this.. Anyone have any ideas?