My 1971 Tahiti I/o trim drive number is 45060a9*
Here is my issue. I can lower and raise trim fine.. But once lowered, I can walk back behind boat and grab my drive and raise it up on my own by hand. There is no downward pressure to keep the drive down. My serial number is 2919040 on my motor Its a merc 165.*
What is the issue?
Fluid was 8oz low.. I filled.. And still same problem after bleeding

Is there a more modern trim drive upgrade I can do? Do you have a diy to point me to?

...just tapped out with a thumb or 2, please don't mind the abbreviations and grammatical faults.