727 Reaction shaft

I recieved a 727 torque flight (used) for my challenger, plan on installing it on my engine on the test stand. I am not a tranny guy, so excuse my ignorance. I was told, it will "probably work" but may need new seals. I want to install it, so I can play with the engine on the stand. Anyway, I was looking over things, the output shaft locks into place when in lever is in park, as I expected, I can turn the output shaft (when not in park) and the input shaft by hand, but the reaction...

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Author: Kevineng