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Kanzaki Transmission to Yanmar

Had the transmission pulled from the engine to replace input and output shaft seals during the refit. Been in the water a few months now. An observation now that I am in the water. When in gear, forward or reverse, I hear the transmission working quite loudly and more noticeable than in my Hunter sailboat with Yanmar and same make transmission. This is a larger engine and clearly different size transmission but did not notice a noisy transmission. Mostly when the engine at low RPMs. Is this unique to this engine and transmission. Is it normal?. Oil level appears to be good. I was expecting the 3QM30 to be noisy but wasn't so much expecting it from the transmission. Not a knocking or anything abnormal sounding just noticeably louder than expected. Thoughts?