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found on my tranny: D7UP-7006-AA
found on the back of my engine block: FY683387
7006 = Ford casting basic number off the trans case.
D7UP = 1977 Econoline.
If the trans pan has 11 bolt holes: C4 / If 17 bolt holes: C6.
Some 1977 300 I-6 Econolines came w/a C4, some came w/a C6. 351W/460: C6 only.
But, 1977 Econolines were not available w/a 302. 300 I-6, 351W/460 only.
Since I cannot cross the casting number over to a part number, it's possible this same trans was used in 1978, the first year since 1974 that a 302 was available in an Econoline.