what would it feel like if the flywheel came somewhat loose.

or maybe the pressure plate?

 

what is your car doing?

 

fine on the start of first gear. then about 3-4000 in second kinda gets shakey, but only when accelerating. when the clutch is pushed in its smooth riding.

does this in all gears.
the higher the gear and the slower im going, the worse it shakes. i can feel it in the tranny or the passenger side mostly.

 

it could be your pressure plate. are your axels ok?

 

could be a number of things...you say it does it during acceleration which means its probably bad axles or a bad halfshaft carrier bearing. if the flywheel bolts came loose you'd feel the vibration just free revving the engine.

 

Vibration under load (acceleration) is usually an inner c.v. joint problem.