Early Bronco Ford C6 Automatic Transmission

The Ford C6 is a heavy-duty automatic transmission manufactured from about 1964 to 1996.

The C6 was used in trucks and cars with larger engines. Five different bell housing varieties exist for use with various Ford engine families:
The Windsor pattern was used on the 300 I6, the Ford Windsor engines 289, 302, 351W and the 351 Cleveland.
The 460 pattern was used on the 351M and 400 and all of the Ford "385" engines.
The FE pattern was used on the FE engines
The rare 66 - 68 Lincoln MEL 462 pattern which was used on 66 - 68 Lincoln Continentals with the 462 engine and also on 68 - 69 Lincoln Continentals with the 460. This pattern rounds off on the passenger side to clear the heat/AC box on the 66 - 69 Lincoln firewall.
Diesel pattern. This was similar to the FE/"385" pattern but the two are not interchangeable.

The transmission is very popular in off-road applications due to its reputation of being nearly indestructible. It does, however, have a reputation of greatly reducing performance as well as fuel mileage, due to the amount of power it requires to operate.

If you are choosing a C6 for your Early Bronco application a 4x4 trans from the 1978-1991 Bronco or 1967-1996 Ford F-Series will be where you want to start.