Last year, before I turned my boat into a drift boat, I was having some problems with reverse. ('74 inline 6) When I bought it last year, it had no reverse. The previous owner gave me a reciept for ~$900 worth of work on a "reverse problem". I adjusted the shift cables, and it worked great for a short time. Then, it would reverse fine for a few seconds, and then kind of jump out of gear for a second, and go back to working fine again. By the end of the year, it would make a horrible grinding noise the whole time you were in reverse, although it still went in reverse.<br /><br />Any ideas what's wrong? Right now the lower unit is detached, I'd like to get this problem fixed before my new powerhead gets herre if I can.