I put a new clutch assembly in a 1967 chevy C10. It had no vibration when driving before the work and after almost shock my teeth loose after the install. I took it all apart and had the flywheel and clutch assembly balanced, they removed 43 grams off the flywheel, after that smooth as glass. That's after trying two different clutch assemblies. Thankfully it was only about an hour to remove everything.
