a broken input or output shaft would cause no movement so would a stripped converter or broken pump gears so no way to know with out tearing it down.As someone thats been in the buisness over 20 years I would forget about the whole lockup deal.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4