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07 = Ford 9 Inch / 3.25-1 / Non Limited Slip / 3300 lb. Rear Axle Capacity
DSO 61 = Domestic Special Order from Dallas, TX district
61 = Dallas TX Ford District Sales Office, where the original selling dealer ordered the truck from.
If a 6 digit DSO: First 2 refer to the above. Last 4: Domestic Special Order number: Truck ordered special by original purchaser, not "bought off the lot."