Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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No problem at all. There's even 2 ways of doing it.
The "A" answer is to acquire a Shimano shifter with the proper number of speeds either attached to a new brake lever or buy separate replacement brake levers (my personal choice). Besides replacing the cables and housings (which will come with new in the box parts), you'll also need a set of new, properly sized handgrips too.
The "B" answer is to carefully cut the shifter away from the existing brake lever and replace just the shifter. That'll save you around $25.00 if you have to pay full retail for the parts.
If you happen to find a trashed bike that has the "right" shifter parts on it, take $1.00 of the money you just saved and buy a lottery ticket immediately because this is your lucky day.