You can convert a 9 speed to a 13, or a 13 to a 9 speed.
To change a 9 speed to a 13, you add an overdrive splitter box onto the rear of the transmission, add a splitter button and air lines, and shorten the drive shaft.
You do the opposite to make a 13 a nine.
It won't work with a 10 speed. You either have a 10 speed direct, or a 10 speed overdrive.
You can drive a 13 exactly like a 9 speed, and never split any gear except the highest gear.
You can get an extra gear out of a 13 speed that a lot of people don't know about. When changing from 3rd, instead of going to fourth, change the range selector to high, and go into the low position(where 6th is on a 10 speed). Then you can split that gear to overdrive, and split each gear all the way out.
Most people won't need the extra gear, but in the old 318's and 250's you needed every gear you could get taking off up a hill.
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