727 or 904

[luxor2 <luxor2@xxxxxxxxxxx>]

Hi folk

Please excuse this obvious question but what is the easiest way to tell the difference between a 727 and 904? The service manual for 1965 B bodies shows the 727 is a slip yoke and 904 is a trunion drive shaft for this year. I have a big block (500 MPcrate motor). When I pulled the trans, it has a trunion. My guess its a 727 since it is a big block and it was swapped at some point. 

Can a 904 work with a big block? I did not see any adaptor plates under there.
Where are the serial numbers that I can reference? 

Thanks in advance for your help. As for the thread about 1st Mopars. This is my first, and thank to this group, I learn more and more each day. Thanks everyone. 


Ray 
1965 Satellite
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b7yoMz.