The dual mass flywheel on the Focus is warped. When engaging the clutch it seems to shake the car if it needs to slip (starting out on a hill). The clutch material is still good. It doesn't slip at all and launches great. Pulling a pretty steep hill with the car loaded down very heavily, I was able to hold 55MPH in 3rd gear with my foot to the floor and it didn't slip at all. The shaking is quite irritating to me. I am going to replace motor mounts in the spring to help stop transmitting the shaking through the body , but at some point, I'm going to need to have something done. I warped the flywheel while in a traffic jam. Due to asinine gearing on this car, it idles too fast for traffic jams. Needs a stump puller granny gear. Instead of on/off the clutch (wearing it out) and riding it, I rode the brake pedal. Engine vibrated, warped flywheel. Are there any dis/advantages to going from dual mass to single mass flywheel? It seems there are performance options and heavier duty clutches in the 'regular' single mass flywheel category. What would be recommended to replace on it if I do this? The car has a LOT of city miles. The first 17K miles are pretty much purely city. Throwout bearing? Slave Cylinder? Any suggestions?