The Ford C6 uses engine vaccum to sense the shift points. In a diesel engine setup there is a vaccum regulator to accomplish the same thing as in a gas engine.
Mainly because the C6 transmission only has 3 gears and no overdrive.
ford c6 is a 3 speed 3
should have C6 stamped on it somewhere
More than likely it is a C6. If the shift indicator has a circled "D" (for overdrive) it is probably an AOD. But I am not certain they put AODs behind 351 (5.8) that year.
NO
Bolt spacing where the bellhousing mates to the back of the engine.
Type F for a 1971 C6
Ford C6 if it will fit.
C6
No the c6 is a 3speed automatic transmission that was used on earlier fords.
Likely, your shift linkage from the carb to the tranny has become disconnected. Or, it's designed that your engine is supposed to slow so the transmission can safely shift gears. I say just live with it. It's not causing any problems.
Depends on the C6 transmission you have. They made several variants for different Ford Engine types for the FE and 385 Big Blocks. So For a 390 you will need a C6 that mates to an FE engine.