To find out, put your car in 2nd gear and floor it. The tach will jump up to the stall speed of the TC. My 96 TBird with a stock Mustang GT TC would stall at 2500 RPM with the 2nd gear start. It would break the tires loose at just under 2000 in first.
These are the factory brake stall ratings from FORD. I will take these numbers over what some individual find.