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Message: <blockquote data-quote="Mike1261" data-source="post: 1452718" data-attributes="member: 23653">I bought an 03 GT with 158k and TR3650 last summer.By the time I got it home the throwout bearing went bad so the car sat till Jan when I changed the clutch, tires, shocks & struts (Tokico) and Eibach Pro-Kit springs.Finally I got to drive the car, and I noticed that with the top up I could suddenly hear and feel lots of things that I overlooked with the top down.The transmission makes a lot of noise. I'm sure it needs a rebuild at some point.But the most annoying is how much the car shakes and vibrates going down the road.It gets worse over 45-50mph. I don't really drive highways around here, but if I did it would be unbearable.The vibrations DO NOT change when the clutch is pushed in. It also DOES NOT change with the Transmission in Neutral.I was thinking maybe the tires are cheap (but new) and maybe not the best quality. Perhaps a Road Pressure balancing would help.Unfortunately I made all the modifications at the same time so I can't say whether or not it had vibrations with the old bald tires. But when I bought the car I drove it top-down which makes vibrations and noise disappear, and the shocks and struts were toast so the car drive like crap anyway.I've rotated the driveshaft into all possible positions in case vibration subsided at all. No luck.I considered motor mounts, but clutch down and transmission in N, no change at all even when revving up the engine. Smooth as buttah..Where do these SN95's typically develop their vibrations? Where would you start with diagnosis?</blockquote>