What bell housings are you using for the manual? MII or late model? What year engine? Pre-82s use a 28oz balance. 82 and later use a 50oz balance. Also, if you're using a late model bell housing and flywheel on a pre-82 engine, changing the harmonic balancer to the late model balancer won't work either, you will still have the vibration. Early engines were internally balanced at 28oz so you'll still have an imbalance. I know this from experience...
Last edited by roystere; 10-21-2013 at 10:53 AM.