how to get a B & M megashifter to work with 727 torqueflite manual reverse valvebody

Jeff Mullen said
I'll try. my phone takes bad pics without tons of light.

Did you buy the shifter new? If you bought it used it's possible that it's not a Mega shifter which should ratchet both ways. Try going on Youtube as B&M has many videos on there showing correct operation of their shifters. Good luck!