Ford Thunderbird, MN12 (USA)

Differential fluid capacity & service interval

Ford Thunderbird, MN12 (USA) differential fluid capacity ranges from 1,47 to 1,58 liters. Service intervals require checks every 12000 km or 12 months. The data covers 4 configurations.

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

TypeSpecifications
  • Thunderbird 4.9 (1991-1994)
  • Rear
  • Use: Normal
  • Capacity 1,58 liter
  • Check 12000 km/ 12 months
  • Thunderbird Base (1988-1997)
  • Rear
  • Use: Normal
  • Capacity 1,47 liter
  • Check 12000 km/ 12 months
  • Thunderbird LX (1988-1997)
  • Rear
  • Use: Normal
  • Capacity 1,47 liter
  • Check 12000 km/ 12 months
  • Thunderbird Super Coupe (1988-1995)
  • Rear
  • Use: Normal
  • Capacity 1,58 liter
  • Check 12000 km/ 12 months

Additional Notes

  • The Ford Thunderbird MN12 rear differential fluid capacity splits into two distinct values across the model range: 1.47 liters for the Base and LX trims, and 1.58 liters for the 4.9 and Super Coupe configurations.
  • A 1.47-liter rear differential capacity is shared by the Thunderbird Base and LX across the full 1988-1997 span covered in the specifications.
  • The Thunderbird Super Coupe carries a 1.58-liter rear differential capacity, which is the same figure specified for the Thunderbird 4.9.
  • The Thunderbird 4.9's 1.58-liter rear differential capacity applies to the 1991-1994 model years, a narrower window than the Base and LX entries.
  • The Super Coupe's 1.58-liter rear differential capacity covers the 1988-1995 model years, while the Base and LX retain 1.47 liters across the same period and beyond.
  • All four configurations share an identical service interval: a fluid check every 12,000 km or 12 months, whichever comes first, under normal use conditions.
  • The 12,000 km or 12-month check interval applies uniformly across all trims and engine variants listed, with no differentiation based on trim level or displacement.
  • The 0.11-liter difference between the 1.47-liter and 1.58-liter capacities reflects a meaningful distinction in differential housing size between the two groups of configurations, relevant when measuring fluid level or performing a service fill.

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