SBP 8&3/4 going together and I cant get one axle in all the way, lacking ~1/4 or so. (open chunk). w the chunk out & it mocked up w the backing plates on (& no foam or steel shims) and the axles in I have exactly 1&9/32" between the splined ends but even them I have to pound the axles in which I am not comfortable with. pull apart/add chunk/reassemble axles/b plates I have the ~1/4 I cant get in. The housing is 52&5/8" and it feels like I'm hitting solid metal. Thank you for your time.