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Will I be able to retain my 35 splines axles from my 8 3/4 ?


You will be able to use the old axles. But you will have to narrow the new housing about 1" narrower. The Dana pinion is offset. A Dana has one axle longer than the other. The shaft splines are long enough to slide the axle through the spool, no need to cut it off. So when you set it up, make the housing cut so the long axle side uses your existing axle length. The Pinion offset will result in the other side being shorter. Thus the shorter housing.
Doug