(23711130400) - Trans Mount-528e/533/535 (82-88), 635 (85-89) (Green-Firm) (Genuine BMW) (4 available)

Trans Mount-528e/533/535 (82-88), 635 (85-89)(23711130400) (Green-Firm) (Genuine BMW) - includes 8mm flanged locknuts. (9i)

While both 23711130400 and 23711130399 are physical rubber gearbox mounts utilized during the classic BMW E28 (5 Series) production run, they are not interchangeable and carry distinct mechanical properties intended for completely different drivetrain weights. The primary difference between the two part numbers comes down to rubber compound density (durometer hardness) to account for engine configurations:

• 23711130399 (Light-Duty Variant-Gelb/Yellow): This mount is designed explicitly for the lightest powertrain setups in the E28 lineup. It features a softer, more pliable rubber core engineered to isolate high-frequency harmonics from smaller engines.
• 23711130400 (Heavy-Duty Variant-Grun/Green) - this is the mount offered here.

Depending on the specific engine and model year, this mount is used for either manual or automatic transmission crossmembers:

• BMW 5 Series (E28 Chassis):
  • 528e (1982–1988): Standard manual models (all years) and automatic models built after 04/1986.
  • 533i (1983–1984): Manual and automatic variants.
  • 535i / 535is (1985–1988): Manual and automatic variants (specifically for models running the Getrag 260 manual gearbox or standard automatics).
  • 524td Turbo Diesel (1985–1986): Automatic transmission models built from 04/1986 onward. 
• BMW 6 Series (E24 Chassis):
  • 635CSi (1985–1989): Primarily used for automatic transmission variants.