I have a 2001 Chevy blazer. I had hired a guy to piut in a water pump. He did cool job but when he put the radiator in he punctured it. Then he forgotten to put the little bracket that holds the tranns line to radiator from transmission. My blazer had stalled and it seemed the transmission was gone but I dropped the pan and no metal no shavings I start it but none of the gears catch I am wondering if it is the transmission or the tranny pump or something else .