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Message: <blockquote data-quote="MORDENENOUGH" data-source="post: 345893" data-attributes="member: 9439">I have the same problem, my car is lowered 1 1/2 inches, with exhaust and suspension mods. My vibration comes on around 2200 -2400 rpm in 5th gear while cruzing on the highway. My clutch setup is new and I had the factory flywheel surface machined. I'm running poly motor and tranny mounts... I didn't notice an issue until I did the clutch work and mounts... did it at the same time.  I still run the factory driveshaft. I was told that when I installed the driveshaft, I didn't bolt the flange up in the same position as it came off. Does that make sense... only if its out of balance. The other thought I had was maybe a problem with the machine work or clutch set up, its a Borg Warner Cobra replacement. Is it possible that the pinion angle is out of wack now that the cars are lowered? I know this doesn't help your cause but would appreciate any clues as well.Thanks</blockquote>