My brother's 1985 Pontiac Fiero V6 standard.

My brother's 1985 Pontiac Fiero V6 standard trans has just bit the metaphorical dirt. Recently replaced master clutch cylinder and car ran well for a while, now will not go into gear at all. Leaking massive amounts of fluid, fairly sure it's gasoline. Transmission fluid is full, and car starts. When car is started, high-pitched squealing noise persists and engine sounds rough. When I attempt to shift into gear, car won't move at all. No matter what gear I'm in, reverse, 1st, etc. It's as if I'm in neutral. Have to have bricks blocked back tires so car won't roll away. Clutch depresses fully, shifter moves to the correct positions no problem, and when "in gear" car revs and I can hear the whirring of the trans rotating but no catch. Does this mean trans dropped or could it be something else?