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Pitch Shifting Algorithm

Hi All,
I've had a request from someone in our department for suggestions for a pitch shifting algorithm that will be used to shift the frequencies of phoneme pairs (e.g. ba-da) into the center range of rat hearing (~8kHz) without affecting the temporal cues of the speech stimuli. I'm unfamiliar with available software to do this (and pros and cons for specific kinds). We do have some commercial software here such as Adobe Audition and SoundForge that have pitch shifting algorithms as part of their software package. We are hoping to limit artifact as much as possible. Would these be appropriate algorithms to use? If not, why not and any suggestions as to which software program would be more appropriate?
Ben Hornsby