@thedeuceman thanks for the details. You say the transom was leaking around the splashwell drain, was there a crack near the drain or something or how did you know thats where it failed? I am wondering where the transom failure or transom cracks originated from? Near splashwell drain or was it cracked in the transom corners, motor mounts etc? Just wondering how severe the failure was and where it originated from so I can be on the lookout for high stress areas! As in now I am going to go and re caulk my splashwell drain!
@Hyperacme interesting that the cracks only seem to be on 1976s. I did have some water drops leaking in the back transom area late this season and I thought it was leaking through the splashwell. After further hose testing it was leaking through the chrome trim piece that covers the deck/hull transom joint. So like you said, there isn't a seal back there on that joint so I put a layer of caulk over it and it sealed it all up. I also re sealed my spedo tube holes for good measure since I had the caulk out.
When the times comes that I need to redo the transom I will most definitely investigate an composite solution but hopefully thats down the road.