I just installed a slightly used turbo350 from a buddy of mine .. I installed a trans go shift kit & Brand new converter and now at 1100 -1500 RPM I have a vibration... It does it when I take off from a start & it happens if im in Park and I rev the engine a little.... But once it hits 1500 RPM it goes away... Took it for a ride & it shifts good ....Is there something with the transmission that would cause this ? Im thinking about just throwing some Plugs in it and see if that fixes it ...Im hopping I can rule out the transmission..... Sorry for the long post......Thanks. any help will be great.