Transmission differences and questions

[3dodgedoobie]

 Ok I have a 47 Plymouth 4dr. I bought this car with locked up motor. Got it freed and would backfire threw carb. Stuck valves and 1 broke one. Ran block numbers and it was out of truck..  No biggy as it was Just a driver. Well couldn't get broke valve out. So I done So be work on another couple cars and had good deal on a later model motor and tranny.  Which ran numbers and it's out of a 53 plymouth car.   Know here is my issue. I took the motor out of car with tranny attached. It will be the dirty rusty pictures.   Set it beside the good motor and noticed the transmission is differant.

The installed combo:                                     1)has longer tailshaft.                                  2) has these numbers on passenger side 1139152-13.  And on side with selector is PF 853835-76 best I could tell.

The uninstalled combo:                                 1)shorter tail shaft.                                     2) 1139152-4. With a large H under the 4 and on other side at selector is PF 853855-773 best I could tell.

Could I swap out tailshaft with the 2?

Also could I change brake hardware out. The one that is the fresh motor has new brake parts on it. Along with new clutch pressure plate etc in it also. The whole motor was rebuilt. I have pictures but the a lot bigger than aloud on here to upload. 

 

Thanks for any and all help