Hey thanks for responding mate. I have figured it out . It is actually not a Trim/Tilt unit. It was designed for tilt only basically limitiing the strength of the hydraulic unit. With the high thrust of the 9.9 at higher speeds , It was just too much on the unit. Perhaps if the boat was just a little rower it might not have that issue. While using it as a AUX. it was just hurtin it. Thank you again for taking the time. Cheers, Tony Portland, OR.