I had the shake down run on my boat. It was an event, but that a different (fun) story.

My transmissions were slipping and I over revved the engines and scrambled the top end of one of my new engines. I not worried about the engines, but I was wondering what the diagnostic procedure would be for checking transmission, u joints, and couplings. Any help would be greatly appreciated.

I have a 1981 33 Cigarette with twin custom 454, Borg Warner Velvet Drive transmissions, and TRS drives.

See your other post under Drives and Lower Units