How to Change the Ford 9 Differential Fluid

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Ford's 9-inch differential is known for its durability.

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Along with the 10-bolt differential produced by General Motors, Ford's 9-inch differential is among the most popular differentials with automotive enthusiasts. Ford first produced the 9-inch differential in 1957, but eventually phased out production by the end of the 1980s. The differential consists of two gears, which rotate along with the drive shaft. The differential makes use of a heavy fluid, which keeps the gears lubricated and cool. The fluid can be quickly changed with the assistance of a fluid pump.

Difficulty: Moderately Easy