My 2001 tiburon 5 speed manual vibrates/hum at 3000 rpm in every gear and only when in gear

 

Don't drive your 2001 Tiburon at 3000rpm... problem fixed.

 

We need more info. Is there a vibration in the steering wheel? What mods do you have done to the car? If you have a video or sound clip, even better. But your post is extremely vague and would be near impossible to diagnose without more info.

 

If it's only when in gear, it's something in the drivetrain past the flywheel/flexplate. If it happens only at one engine speed regardless of road speed, it's between the flywheel/flexplate and the end of the input shaft. That leaves clutch/torque converter, throwout bearing, transaxle input bearing, input shaft, and gears.



Unless I've missed something. Sorry to say, this sounds like a hassle.

 

You need an extra jiggawatt for your flux capacitor.

 

+1 on what Stocker said.

 

If its just at a certain engine speed check your motor mounts. Are you running stock or aftermarket pullies?