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Welcome to FTE. You will possibly get better answers on the C6 if you post the question over in the driveline section of this site. https://www.ford-trucks.com/forums/forum69/
<center> C6 transmission identification tag </center> The identification tag for the E4OD transmission is located on the left hand side of the transmission case just behind the Transmission Range (TR) sensor.
<center> E4OD transmission identification tag </center> <center> </center>
According to the D5UP, It came out of a 75+ Ford van.
If the top two bellhousing bolt holes measure 5 1/8" center to center then it's a 300/302/351W transmission. If they measure 7 3/4" then it's a 351M/400/429/460 transmission. And if it measures 6" ( which it shouldn't if it's out of a van ) then it's a 360/390 FE transmission.