My shower is leaking,water streaming throught the ceiling onto Garage floor

Sounds like a problem...

Cocean - based on what you posted, the best advice you could be given is to turn the water off and call a plumber. Do a little investigation, maybe take some pics and give the helpful people on the forum some more information.

no one who knows anything (and I'm not one) can help you without some more information. Let's hope you fixed it by turning off the water. And now you can try and figure out what happened.

If you can find the leak, it might be. Start cutting out the ceiling and tell us what you find.