I have heard aftermarket Belville Springs bending, we used a factory one as they are supposed to be better.
I take your point about excessive pressure bending the fingers, as to me thats what looks like happened. On the previous pass I badly overrevved it, so that spike could have caused a high pressure spike in the trans?
I will definetly be checking line pressure when back together.
Thanks for your input.
Have you heard of 2 springs being used, Im thinking the pressure required to force teh 2 springs up will take clamping force away from the clutch pack.
Over-rev might have caused a pressure spike, maybe...
Usually by 3000 rpm pressure is maxed anyway.
I have seen 2 springs used as installed by the factory on some Benz and ZF transmissions, so it's not a completely out there idea, but those were very thin.
I've just never seen it used on a C4 as a modification, and would still be concerned about weakening the drum with the machining.
Good point about the extra force that might take away clamping force from the clutches.
I was going to mention that too.
I'm not sure there would be all that much extra pressure/force needed with 2 springs.
Consider that the spring acts as a lever on the clutch pack anyway.
I suppose you could put the springs in an arbor press and measure/compare how much force to compress 1 and then 2 stacked.