if you have a 4 speed KE55, then a 4 speed from either a KE30/35 or KE55 will bolt in.
a 5 speed from a KE55 will also directly bolt in.
there may be some differences with the speedo driven gear, but the drive gear should be same (ie, pull otu the speedo driven gear, and compare the number fo teeth with the one from the new box, or just re-use the old one)
the 4 speed is a K40, the 5 speed is a K50., (however the 4 speeds are all called K40, from KE10 through to KE70, but there are soem significant differences between them) (the 5 sped from KE55 and KE70 are both called K50, but they have very different extension housings, and need different rear cross-member mountign method, plus the KE70 shifter is further back)
you can also use a KE70 5 speed, BUT you need to have an xtension housing from a KE55 anyway, and there may be some difference in position of the reverse gear switch
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