S&S 5-SPEED TRANSMISSION CASES FOR 4-SPEED BIG TWIN

The fmc-750610 (S&S 56-1051) 5-into-4 transmission cases for 4-speed Big Twin style frames with 1970-1984 Shovelhead style drivelines and chain final drives is obsolete. They were used with a 1980 to early 1984 5-speed style chain-drive main shaft (fmc-234729 or fmc-234090) and 1980 to early 1984 style main drive gear (fmc-234706 or fmc-234578). The majority of the other internals are the same as for 1980-2006 5-speed Big Twin. Specific replacement parts are listed below.