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Could be any of several. Check the little metal tag bolted to the diff. That truck also likely has a 8.8 rear, not a 9 inch. If the tag says "88" it's an 8.8. The gear ratio will be stamped with no punctuation, i.e. "327" would be a 3.27 gear.

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14y ago
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Q: What is the rear-end gear ratio on a 1989 Ford F150 with a ford 9in and a 5.0L?
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