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If its the layshsft you need to dremel the gearbox housings to allow for a larger diameter for it to turn and not rub etc
If its the diff that's right when you mount both halves to the motor mount you need to threadlck the holes and back off about half a turn each screw
Also when you mount the turnbuckle for the saddle lip strap make sue it drops freely so loosen that screw also