have an 1989 Merc black max 200 A12491. couple weeks ago would not go into forward it would just grind and jump. took apart lower unit. found one spring of two on clutch dog was broken. replaced both springs and the clutch dog and put back together. this week go so smooth into forward it is unreal. But now it wont go into reverse. Just jumps and grinds. All gear teeth look good. When lower unit is off the shifter rod is exposed. It turns and seats nicely in one direction but feels sticky going the other. It is like it doesn't want to cam over when shifting into gear. tried adjusting the cable a little but no help. Could it be in the shifter lever itself not pushing the cable back far enough or maybe fast enough.