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Just a rookie thought here. My 727 book says the kevlar band is too harsh on the drum & can cause the drum to glaze over. They don't recommend it on any shifting drum. Could the drum &/or band be glazed thus causing the slip?

Of course, I read that after I installed one in my trans. Very interested in what you find is the issue. If it's the band then mine may come back apart as well.



What he said , Kevlar is no good for the front band, it's fine on the rear because it is not trying to stop a moving drum.