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Discussion Starter #1
My car was suffering from vibration when the clutch were engaged in first gear. Also I could easily feel vibration at the clutch pedal when one rest the foot ovet it. So I removed the flywheel, and took it to a machine shop to get it resurfaced. To my surprize, when the flywheel/trans was re-installed, the vibration persisted. Drove the car a few times and removed the trans again to replace a broken front bearing retainer. This time, a new Centerforce II clutch kit was installed, together with a new throw-out bearing & pilot bearing and trans mount. Since the flywheel had been recently resurfaced, I didn't doit again this time. Know what, Murphy is around the garage these days, the car has the same symptom as before. Can I conclude that the problem is a faulty flywheel? Any other causes to that malady? If it's that, I'm planning to order a new GM unit, is that the best choice for the price?

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Have you dial indicated the bellhousing? Any chance the input shaft is bent or twisted?
David

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67 RS 327 original owner. 69 Camaro Vintage Racer, 65 Lola T-70 Chev SB Can-Am Vintage Racer
 

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Discussion Starter #4
The bellhousing wasn't indicated, it's the same GM unit that came with the car when I bought it. As for the input shaft, how can it be checked? Removed from the trans in a lathe? Or can it be checked installed in the trans.

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Usually, with the foot resting on a vibrating clutch pedal, its an indication of diaphram fingers not the same height from the flywheel.

But, with a new clutch, it might be an unbalanced flywheel. A chip may have gotten between the flywheel and machine's bed and planed off some material. Now, the flywheel would be thin on one place, and thick 180 degrees on the other side. Kind of a long shot, but, possible.

One can remove the input shaft from the trans real easy. Place the trans upright between two tables with the input shaft pointing down. Place a drain pan underneath the shaft. Remove the bearing retainer, and pull off. Might want to replace the bearing retainer, pretty cheap. Pull on the input shaft carefully straight down. There will be some needle bearings come with it and the fourth gear synchronizing ring.

For re-assembly, apply grease to the inside of input shaft, insert needle bearings into grease, place greased synchro ring onto shaft. Carefully insert shaft into trans making sure the three pawls engage with the three slots on the synchro ring. Tighten bolts when bearing retainer is mated to surface. Fill with oil after installing into car.

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Check the engine mounts, specifically the drivers side.

Also, in the instructions read the part on break in. This is a common problem with dual friction type clutches (not just CenterForce).
 
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