Launch issue, what do you mean by launch? Are you talking about a shudder if you feather the clutch from a standstill or a shudder if you "dump" it from a standstill?
Both.
I have added traction bars to it and set the snubbers against the springs. You can drive it with very little to no shake at launch that way. I don't like doing that but it at least allows me to drive the car.
If you get the shudder on a feathered start or a dumped start, I'd start looking elsewhere. On a dumped start the clutch is going to lock up quickly. If you have a shudder after that occurs, how could it be clutch related? It is interesting that putting the traction bars solid against the springs virtually solves the problem. You wouldn't have a broken spring or a loose differential by any chance?
I put new Super Stock springs on and didn't see any difference in shake. As far as the differential goes, I talked to Dr Diff for quite some time about the issue tapping his knowledge about differential operation and his contention was that it would not be the carrier. To go a step further a fella on A Bodies Only site that followed my problem also has the same problem with his 68 383-S car.
I also need to add to this mix that the car does not shake every time you let the clutch out hard or soft. I would say 70% shake if I put a # to it.
Also to answer a previous question, I can't say I've checked crank play but wouldn't you think I would have allot of other things going on to with motor vibration if the crank had an issue like that? It's part of thinking out of the box at this point though which is what I'm trying to do. I very much appreciate all this food for thought.
