I changed my impeller on my '82 402 Merc and after installing the lower end I'm unable to shift into reverse. Forward works fine. The actual shifter will not go into reverse. If I disconnect the linkage the shifter will then go<br />into reverse. It appears that the slide on which the cable attaches will only go so far but the cable wants to go farther. Do I have an adjustment problem? I purchased a Clymer manual for that year but there is nothing said about adjusting the cable. In fact there isn't much said about installing the lower end. Going crazy refuse to fish from shore!! Please help.