How to Find Out the Axle Ratio on a Ford Pickup

by Thomas West
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A vehicle's axle ratio is determined by the number of revolutions of the driven wheels in relation to engine and transmission revolutions. Some vehicles, such as Ford pickups, are available from the factory with different axle ratios, depending on the owner's needs. A numerically lower ratio might be desirable to an owner who prioritizes fuel economy over hauling or towing capacity, whereas a numerically higher ratio might provide extra power at low speeds, but at the cost of lower fuel mileage. Find out what axle ratio your Ford pickup has in just a few minutes.

Step 1

Open the front door on the driver's side.

Step 2

Locate the Truck Safety Compliance Certification Label on the door pillar near the door latch.

Step 3

Locate the two-digit code in the box labeled "AXLE," which is just below the bar code.

Step 4

Match the code on the label to the corresponding rear axle ratio. The code "15" means your truck is equipped with a 3.15 axle ratio; "27" refers to a 3.31 ratio; "19" to a 3.55 ratio; and "26" to a 3.73 rear axle ratio.

Know that if your truck is equipped with a limited slip or locking differential, the rear axle codes displayed on the label will be "H9" for a 3.55 ratio, "B6" for a 3.73 ratio, and "L6" for a 3.73E rear axle ratio. (Note: The 3.73E designation refers to an electrically locking differential, while the other two designations refer to a standard locking differential.)

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