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The Ford F-150 axle code H9 means that the truck is equipped with a limited slip differential featuring a 3.55 gear ratio. With a limited slip differential, power is distributed to the tire with better traction while reducing power to the slipping tire based on the level of traction and slippage. This is beneficial in wet or snowy driving conditions. The gear ratio indicates the number of times the drive shaft must rotate for the tires to complete one full rotation.
The code stamped on the axle of a Ford F-150 shows that the truck is equipped with a 3.55 Limited slip rear end.