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i want to say the 9in came on the 7.5axle, and the 10 on the 8.8axle. I could be wrong. But a big guy like you, 4x4 and extended cap, should have the 10inch.
Just did my wheel Cylinders. I had a 10 inch on my 98 4.0 4x4 ext cab. I called Ford before I ordered the parts, and even they do not know. She said that they gave the option for both. Your best bet would be to go under there and measure it.