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If I remember correctly, 1984 was the first year for the 722.4.
If you suspect things may have been changed, look for the numbers stamped into the transmission itself, on the right side (passengers side) of the case itself, just above the oil pan line, like above the oil pan gasket, may need to clean it up, there'll be a bunch ov numbers, look for the "722.whatever", will be either a 3 or a 4 behind the decimal.
Gilly
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