727 (340) TRANSMISSION REBUILD QUESTIONS THREAD

Is it a factory wide bushing drum or narrow bushing? If its a factory 1971 it will be a wide bushing. I have a few narrow bushing 4 plate drums if someone swapped out the parts to 1970 or earlier. A machine shop can cut a second snap ring groove in a 3 plate drum for 4 clutches. I can give you the dimensions. Or you can use a Turbo 400 pressure plate and shim it to get 4 plates in there.
Doug