help?what is this 4 speed

Mrmopartech said

451cuda,the tranny as I stated is a august built unit of 69 which is a tranny to be use for a 70,since the trannys for that year were being built as of the first of july,mrmopartech

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thanks for the help everyone but still confused this tranny has the 5.125 tb shaft aluminum case iron tail shaft this suggests it 2 be an od tranny right?doesnt have levers on it so cant tell if one is mounted upside down have side cover off how can i tell by looking at the gears any help sure be appreciated