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What does a Ford H9 axle code mean?

I want to change my differential oil, but I’m not sure what it takes. Can you tell me anything about a Ford H9 axle code?

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Heather Bernhard · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Did you know that the axle code found on your truck’s doorjamb can give you A LOT of information about your differential? For example, a
Ford
H9 axle code tells me that you have an F150 with a 3.55 limited-slip differential. According to Ford, you can use a synthetic 75W-90 Limited Slip Gear Oil, and you should change it every 30,000 to 50,000 miles. If left too long, the differential can become noisy and will eventually fail. It’s important to take care of your truck’s routine maintenance, but it’s just as important to occasionally do a
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