727 part throttle down shift questions ?

I got the stamping numbers off the drivers side of the case (above trans pan) H2514487 2551570 Can anyone tell me the built date ?
A100's do not use a regular tranny. They have a short tailshaft/ the drive shaft bolts to the tranny yoke/ and they have a top mount on the tailshaft. And all trucks have 727's mines a 273.