Chrysler Torqueflite 727: This three-speed automatic transmission was commonly paired with big block engines in Dodge trucks during the 1970s. It offered a robust design with a simple planetary gearset and was known for its durability and reliability.
Chrysler Torqueflite A904: This three-speed automatic transmission was another option for the 400 big block in the W100. It was a lighter-duty transmission compared to the 727 and was commonly used in smaller Dodge cars and trucks.
Chrysler Torqueflite 722: This four-speed automatic transmission was introduced in the late 1960s and offered smoother shifting and improved fuel efficiency compared to the three-speed options. However, it was less commonly paired with big block engines in Dodge trucks.
To confirm the specific automatic transmission that should go in your 1977 Dodge W100 with a 400 big block, it is recommended to consult the original vehicle specifications or contact a reputable automotive parts supplier or mechanic. They can provide you with accurate information based on your vehicle's specific model, year, and features.