Last year I had a clutch shudder problem too on my 1927 Chevy one ton truck.

I needed to fix the u-joint (worn trunnions and yokes) and while I was in that area, I lightly sanded the glaze off of the flywheel clutch surface and the pressure plate, replaced the clutch, replaced the pressure plate springs, and replaced the ball bearing in the throw out bearing.

When I put it all back together, the truck had a bad clutch shudder and a squealing noise. I didn't think it sounded catastrophic, so I drove it a little. After around 60 miles of driving, the clutch shudder and strange noises went away and all was well.

I suspect that the clutch had to 'wear in' a little, but since it was working well again, I left well enough alone and didn't tear it apart again.

Dean

I have been driving mine more than a 1000 mile without any improvement, in fact, I think it is getting worse.  I will at some stage have to remove the gearbox and clutch housing again.  I will replace the bell housing with one that has been skimmed.  I will then check again with a dial gauge that the flywheel is not wobbling. After that I will check that the bell housing is parallel to the flywheel.  Then I will check that the crankshaft and input shaft is concentric and re-install the gearbox.  The universal joint is new but I will check the adjustment on the ball and collar.  My Fleetmaster' clutch is smooth and I can really not understand why the Fleetline, with all the new parts, are shuddering.  All the engine and gearbox mountings as well as bushings on the rear axle are new.