BJ-60's from '83 on are 5 speed from the factory, prior to '83 all are factory 4 speeds (in Canada anyway). Earlier ones, such as my '82 have had the tranny swapped out from later models.
All tranny's on BJ's are interchangeable, in that they will bolt up to the engine (I'm not sure if BJ-4X and BJ-60 trannys can be changed) and all BJ-60 tranny's are fully interchangeable (drive shaft lengths ARE different for the 5 speed and the 4 speed as are the floor plates) BUT FJ-XX and BJ-XX are NOT interchangeable unless the input shaft is changed. The 2F and the "B" series engines have a different requirement in that part. I don't know if it is bellhousing differences or what but it is known to be different.
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