There should be no clicking sound coming from the tranny.
Check your drive shaft boots to make sure they're not torn.
When torn they can make that clicking sound.
Happy Boxstering,
Pedro
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Racecar spelled backwards is: Racecar!
When mine did this I freaked and replaced the tranny with one from a salvage yard. My mechanic opened it up before he junked it and said the 1st gear had nicks in it from a previous owner's bad shifting habits.
It would be cheaper if it was a drive shaft boot, although not "cheap" in most people's books. Those are labor intensive to replace.