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What is the factory gear ratio for 1976 thunderbird with 460 and a 9 inch rear end?

There's no single factory gear ratio for a 1976 Thunderbird with a 460 and 9-inch rear end. Ford offered several different axle ratios depending on the options selected (e.g., transmission type, intended use). Common ratios included 2.75:1, 3.00:1, and 3.50:1. To know the exact ratio for a specific car, you'd need to check:

* The vehicle's data plate: Located usually on the driver's side door jamb or under the hood. This *might* list the axle ratio, but it's not guaranteed.

* The differential tag: This tag is usually located on the differential housing itself. It will have the ratio stamped on it.

* The owner's manual (if available): This could list the specifications for the vehicle.

Without checking one of these sources, it's impossible to definitively state the gear ratio.