Kenworth T400 front and rear side marker bulbs utilize 1157, 904, and 67 bulb sizes across different model configurations. The replacement chart covers vehicle production spanning 1982 to 1997 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Kenworth T400 front and rear side marker positions draw from three distinct ANSI-standard bulb types across their model year range: the 1157, 904, and 67.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base. Its dual-filament design distinguishes it from the single-filament types also present in these specifications.
The 904 is a miniature wedge-style bulb in a T10 form factor, rated at 12V and 8W. The wedge base relies on the bulb body itself to make electrical contact, requiring no separate metal base component.
The 67 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 8W. It is a lower-wattage variant of the 1156 family and shares the same base type as that bulb, though the two are not electrically equivalent.
The 1157 and 67 both use bayonet-style bases, but they are not interchangeable. The 1157 uses a BAY15d base with offset pins to accommodate its dual-filament design, while the 67 uses a BA15s base with aligned pins suited to a single-filament circuit.
The 904 wedge base is physically and electrically incompatible with the bayonet sockets used by the 1157 and 67, meaning socket type is a determining factor when selecting a replacement for any given model year.
For the Kenworth T400 front side marker, the 1157 is the most frequently specified bulb, appearing across 1984 and 1989-1992, as well as 1994, 1996, and 1997.
The rear side marker position shows the 904 as the dominant bulb type, specified for 1984, 1989-1993, and 1995-1997, with the 1157 and 67 each appearing in only a single year within the listed range.
The 1993 and 1995 front side marker years specify the 904, a wedge-base bulb, while surrounding years specify the 1157 with its bayonet base, indicating that the socket type in the front marker housing is not uniform across all model years.
The 1982 model year presents an inverted pairing relative to most other listed years, with the 67 specified for the front side marker and the 1157 for the rear, a configuration that does not repeat in any other year within the specifications.