The G4 was a strengthened version of Honda's first 4-speed automatic transmission, the H4. Introduced in 1986 on the new flagship Honda/Acura Legend, it was replaced by the updated MPYA.
Applications:
- 1986–1987 Acura Legend (G4)
- 1988–1989 Acura Legend (L5)
- 1990 Acura Legend (PL5X)