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Not 100% sure, but 7700lb (pre 04) or 8200lb ( 04 up) may have the 10.25. Unless you have the high GVWs, you have a9.75, as long as you have the 5.4. 8.8 for 4.6 and 4.2.
ya i definatley know i have the 9.75, but am now jealous of the f150 guys with the 10.25, most likely ill never break the 9.75, but bigger is always better.....lol