Here's the deal, I just picked up a 2004 6 spd 120k about a month ago.... since then I have been doing some regular maintenance, oil, trans fluid, brake/clutch fluid, coolant ect. Ive been getting some nasty vibrations.... I also just put 2 new axles in the car, which solved 90% of the vibrations. But I am still getting a vibration between 22-30mph. It doesn't matter what gear (2nd, 3rd, 4th) but it's only Under Load. Coasting, or in neutral it will not vibrate. Tonight, for ***** and giggles I rotated all 4 wheels front to back. Nothing.... same issue. All the ball joints seem good, no play in the wheel bearings. Rotors and pads are good. Looked at all the motor mounts, nothing noticeably bad... I'm outta ideas here Suggestions?

 

Havnt done an alignment, but the thing drives straight as an arrow. Steering wheel is straight. Newer Goodyear tires. No noticeable tread wear, even, no burs ect..

 

http://www.heeltoeauto.com/news/04-0...and-fixed.html

You should find this really helpful

 

 

Could be the axles actually... are the aftermarket or OEM? Aftermarket ones usually vibrate

LCA bushings may need replaced...