Fresh 727 Street Strip Trans S.B. Wont Drive

I haven't seen anyone try to install one backwards so I'm no sure.

Does it drive in reverse? If so that rules out any converter problem(s)

Yes It reversed out initally but had nothing after that but then again once i got off the Flat garage floor the drive sloped so maybe I should have chocked the Wheel and try the Reverse but It drives in all gears on Jack stands , Wouldnt that rule out the converter, Its out again , So do I get a third trans Shop to tare it down again or just change the converter , Im still convinced its not the converter , And I dont trust anyone here to cut it open , It is an Edge Custom to my motor etc