Transmission Overheat

[Asset Allocation]

I have a '99 355 with Crusader 454's. It's been a little over a month since I took her out and both engines wouldn't go past 3200 RPM maintaining 18-19 mph WOT. She can usually go up to 29 mph WOT so figured the marine growth was causing the strain and hoped some of the growth would fall off and her speed would improve slightly... but never did. About 20 minutes into the trip the transmission oil overheat light came on the port engine thus the computer forced both engines to power down (but did not shut off). The light went out after the power down also. I put her in neutral then back in gear and putted all the way back to the marina at about 1200 RPM with no other warnings or issues. I didn't attempt to bring her up on plane again because I was just happy she was moving. Marine growth issue? Sensor issue? Any thoughts I can tell the mechanic to check into? Thanks everyone!

Brent
"Asset (Re)Allocation"

[Viper]

Check that the tranny fluid is in good shape and topped up. You may have a clogged tranny oil cooler. Do the engine temps remain normal during the fault?

[Asset Allocation]

++Update++
I had the bottom cleaned clearing all intakes, props and rudder. That did the trick! The bottom was pretty good but the running gear and intakes had sea grapes and gunk stuck on it. After a good cleaning she runs like a top....now.

[Asset Allocation]

To answer the engine temp question yes, they remained in normal temp status...that part is amazing considering the marine growth on the intakes.

[Asset Allocation]

Also if anyone was wondering...my location is Portsmouth, Virginia off of the Elizabeth river. Other boaters have a diver who clean their hulls supposedly on a monthly basis so I guess the marine growth is that bad.

[waybomb]

Wow, that's something.
We kept our boat in Ventura, CA for 3 years. Paid a diver monthly to clean the bottom and change out zincs whenever needed. It was worth the peace of mind if nothing else.