Ford Thunderbird (USA)

Differential fluid capacity & service interval

Ford Thunderbird (USA) differential fluid capacity ranges from 0,12 to 2,6 liters. Service intervals require checks every 10000 km, 6 months, or 6000 miles. The data covers 12 configurations.

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

TypeSpecifications
  • 6.4 (390 ci) (1966-1966)
  • Rear, conventional
  • Use: Normal
  • Capacity 2,6 liter
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9 3/8"
  • 6.4 (390 ci) (1966-1966)
  • Rear, conventional
  • Use: Normal
  • Capacity 2,4 liter
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9"
  • 6.4 (390 ci) (1966-1966)
  • Rear, limited slip
  • Use: Normal
  • Capacity 2,5 liter
  • Capacity 0,12 liter (LS-additive)
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9 3/8"
  • 6.4 (390 ci) (1966-1966)
  • Rear, limited slip
  • Use: Normal
  • Capacity 2,1 liter
  • Capacity 0,12 liter (LS-additive)
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9"
  • 7.0 (428 ci) (1966-1966)
  • Rear, conventional
  • Use: Normal
  • Capacity 2,6 liter
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9 3/8"
  • 7.0 (428 ci) (1966-1966)
  • Rear, conventional
  • Use: Normal
  • Capacity 2,4 liter
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9"
  • 7.0 (428 ci) (1966-1966)
  • Rear, limited slip
  • Use: Normal
  • Capacity 2,5 liter
  • Capacity 0,12 liter (LS-additive)
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9 3/8"
  • 7.0 (428 ci) (1966-1966)
  • Rear, limited slip
  • Use: Normal
  • Capacity 2,1 liter
  • Capacity 0,12 liter (LS-additive)
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9"
  • 6.4 (390 ci) (1964-1965)
  • Rear, conventional
  • Use: Normal
  • Capacity 2,6 liter
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9 3/8"
  • 6.4 (390 ci) (1964-1965)
  • Rear, conventional
  • Use: Normal
  • Capacity 2,4 liter
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9"
  • 6.4 (390 ci) (1964-1965)
  • Rear, limited slip
  • Use: Normal
  • Capacity 2,5 liter
  • Capacity 0,12 liter (LS-additive)
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9 3/8"
  • 6.4 (390 ci) (1964-1965)
  • Rear, limited slip
  • Use: Normal
  • Capacity 2,1 liter
  • Capacity 0,12 liter (LS-additive)
  • Check 10000 km/ 6 months/ 6000 miles
  • Code: 9"

Additional Notes

  • The Ford Thunderbird (USA) rear differential specifications for 1964-1966 cover two engine configurations: the 6.4 L (390 ci), which appears across 1964-1966, and the 7.0 L (428 ci), which is listed for 1966 only.
  • For the conventional rear differential, two capacity figures are listed across both engine configurations: 2.6 liters and 2.4 liters. These represent different axle assemblies that were available, each with a distinct fluid fill volume.
  • The limited slip rear differential configurations carry their own capacity figures of either 2.5 liters or 2.1 liters, again reflecting two different axle assemblies, both requiring an additional 0.12 liter of limited slip additive on top of the base fluid capacity.
  • The 0.12 liter LS-additive capacity is a separate, dedicated quantity specified exclusively for limited slip differentials. A limited slip differential relies on friction modifiers to control clutch pack behavior, and the additive serves that function rather than contributing to the primary lubricant volume.
  • All twelve rows across both engine types and both differential variants share an identical check interval of 10,000 km, 6 months, or 6,000 miles, whichever comes first, under normal use conditions.
  • The 7.0 L (428 ci) engine in 1966 carries the same four capacity configurations as the 6.4 L (390 ci) for that same year, meaning the differential fluid specifications are not differentiated by engine displacement for the 1966 model year.
  • The 6.4 L (390 ci) specifications for 1964-1965 are structurally identical to those listed for 1966, with the same capacity values and the same check interval appearing across both conventional and limited slip variants in both periods.

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