Ford FX

Differential fluid capacity & service interval

Ford FX uses differential fluid with a capacity of 10 liters. Service intervals include checking every 50 hours and changing every 400 hours or 12 months. The data covers 3 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
  • FX 300 (1994- )
  • Rear
  • Use: Normal
  • Capacity 10 liter
  • Check 50 hours
  • Change 400 hours/ 12 months
  • Code: (4x4)
  • FX 375 (1994- )
  • Rear
  • Use: Normal
  • Capacity 10 liter
  • Check 50 hours
  • Change 400 hours/ 12 months
  • Code: (4x4)
  • FX 450 (1994- )
  • Rear
  • Use: Normal
  • Capacity 10 liter
  • Check 50 hours
  • Change 400 hours/ 12 months
  • Code: (4x4)

Additional Notes

  • The Ford FX 300, FX 375, and FX 450 all share an identical rear differential fluid capacity of 10 liters, which is consistent with a service fill volume for a unit of this scale.
  • A 10-liter rear differential capacity is notably large compared to typical passenger vehicle differentials, reflecting the heavy-duty nature of the FX platform.
  • Under normal use conditions, the rear differential fluid check interval is set at 50 hours across all three variants.
  • The change interval under normal use is 400 hours or 12 months, whichever comes first, applying uniformly to the FX 300, FX 375, and FX 450.
  • The hour-based interval structure, rather than a mileage-based one, indicates operation in a context where engine hours are the primary measure of use, such as industrial or off-highway equipment.
  • Despite the differences in model designation between the FX 300, FX 375, and FX 450, no variation exists in rear differential fluid capacity or service intervals among the three configurations starting from 1994.

Other Systems