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I have a 99 bird and Iam going to look for a 2000 pcm so i can get a HHPIII so when i get my gears i can reprogrammy computer and what is y87 computer
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Y87 is a performance package you could get on Firebirds. They came from the factory with 3.42 or 3.23 gears. I don't remember which. The PCM is programed for the gearing so you don't have to change anything else if you upgrade to those gears.
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