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D6TZ-3504-C .. Steering Gear Box - High Boys: Use with Manual Steering or Power Assist P/S / Marked with ID engineering number: D6TA-3504-HA or HA1 / Obsolete
1976 F250 4WD; 1977 F250 4WD before serial number Y20,001.
Note: 1967/75 F250 4WD's use a different steering gear box (C7TZ-3504-M / Marked: C7TA-T).