So when im driving my 2003 350z, if the RPM guage drops under 2000 rpm, when i accelerate is the motor seems to vibrate and it sounds like something is vibrating hard in the trans. After 2000 rpm this does not happen.
It almost sounds like when you hit rumble strips besides the interstate, but not as violent.

Not sure if this or normal, or something fixable.
Im new to the Z world and 6 speed cars. Any help would be great!

 

If you're in a gear that's too low for the speed you're at that can happen, Ie if you shifted to early now you're trying to drive 40mph at 1,800rpm.

My Z wasn't manual when it was running, but it happens a lot in my friend's cars when you go to a gear too early. If you're new to stick this may be the cause.

 

Yeah thats probably what it is.
Thanks!