Re: 1957 Mark 30 lower unit setup Home › Forum › Ask A Member › 1957 Mark 30 lower unit setup › Re: 1957 Mark 30 lower unit setup dave-bernardUS Member - 1 Year (includes $3 online payment fee)Replies: 2014Topics: 30 October 27, 2018 at 11:49 pm #85080 reverse shims go in before the reverse gear and carrier. 1 914 310 7086