I put in my new M46 with a smoothlock clutch disk, reusing the ~4 month old sachs turbo pressure plate on a freshly surfaced flywheel. It slipped really badly so today I ripped it apart and stuck the old sachs disk back in, which did not slip with the old trans. It slips just as badly. As you can imagine I'm not exactly pleased about having spent 3 days messing with transmissions only to have a slipping clutch.. Everything was cleaned, the sachs disk never got oil on it, etc.. I'm confused. It was a perfectly good clutch setup a few days ago and the only change was a flywheel surfacing.
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