It will not fail to release or engage, the point is to eliminate any possible means of chatter so there is equal pressure all around while the disc is slipping during the engagement procedure.
Quote:
Originally Posted by JWL
Just as a relatively minor shim thickness change can be significant to lever height, so too is any compressed clutch disc thickness variations. The Ford spec called for differing thickness solid plates for each diameter clutch with adjustments gaged from the PP cover.
Frankly I doubt the heights could be so far off as to cause the clutch to fail to release or engage. You should do what you are happy with whether it is right or not.
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