I have a cv axle on the drvers side that's clicking when turning. I was wondering if the hd axles from a gtp would fit in my gt?

The driver's side CV axle will work, yes. but not the passenger side axle. The passenger side CV axle on a base model GP is shorter than a GTP's passenger side CV axle because of the HD Differential that GTPs come with

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2005 Pontiac Grand Prix:|SE front|SPO grilles|HPTuned|HUD added|5-button DIC swap|Wizaired CAI|180*|EGR delete|GMPP rear sway|F&R STBs w/DRs brackets|3.29s|HD Diff|7/8" chain|WBS TA's|SD Headers|GenV SSM90 Hybrid(INSTALL PENDING)