AC Cobra

Differential fluid capacity & service interval

AC Cobra uses differential fluid with a capacity of 1,4 liters. The service interval is 4000 miles. The data covers 3 configurations.

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

TypeSpecifications
  • Cobra 428 (1967-1973)
  • Rear
  • Use: Normal
  • Capacity 1,4 liter
  • Change 4000 miles
  • Code: Salisbury 4HU (Powr-Lok)
  • Cobra 427 (1965-1967)
  • Rear
  • Use: Normal
  • Capacity 1,4 liter
  • Change 4000 miles
  • Code: Salisbury 4HU (Powr-Lok)
  • Cobra 289 (1963-1965)
  • Rear
  • Use: Normal
  • Capacity 1,4 liter
  • Change 4000 miles
  • Code: Salisbury 4HU (Powr-Lok)

Additional Notes

  • The AC Cobra rear differential holds 1.4 liters across all three engine variants covered in the specifications.
  • The 289, 427, and 428 engine configurations share an identical rear differential fluid capacity of 1.4 liters, indicating a common differential housing was used regardless of engine displacement.
  • A 4,000-mile change interval applies to the rear differential fluid on the Cobra 289 under normal use conditions.
  • The Cobra 427 carries the same 4,000-mile differential fluid change interval under normal use as the 289, despite the significant difference in engine displacement between the two variants.
  • The Cobra 428, spanning 1967-1973, maintains the 4,000-mile normal-use change interval that was established for the earlier 289 and 427 variants.
  • A 4,000-mile interval for differential fluid is notably short by general automotive standards, reflecting the performance-oriented nature of the Cobra and the demands placed on drivetrain components under normal operating conditions as defined in the specifications.

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