Did you cut enough off of the tip of the input shaft ? Looks like you need to extend the splines with a narrow grinding wheel.I even ground down the spline hub surface of the disc.I ground the side that faces the transmission.There is a lot of info on this subject.You might do a search in the hipo section as well.Here's a couple of pictures of mine.


splines

clutch disc ground side

other side not ground on disc


1951 3100 Chevrolet
1951 Chevrolet Suburban Carryall
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