Just had a new bravo 3 installed. (1990 7.4l 454 mag engine). The trim seems to go up and down fine when i am stopped or moving slowly. When i open it up it seems to me that its not doing anything. Is that possible? Would i definitely notice the drive being trimmed while underway? I see no change when i tilt all the way up and all the way down. Then when i stop to check it again it seems to work fine. Any ideas???