Say yukon,
What year is the Gmc ?
Do you have the tbi like I have with 2 injectors ? or multipoint with 8 injectors ?
Becouse mine leaking around the trottleshaft was nearly becouse pressurerised gas escapes at the trottleshaft and dripping fuel to, so the new O ring solved that but if you have dripping fluid at the shaft while you have multipoint injection then I am afreight it is oil dripping from the supercharger.
Actualy I had my tbi enlarged by a friend who also instald the O ring, but I don't think it is difficult.
Original my Paxton kit came with a modefied Paxton trottleshaft bud some how it was lost so therefore the O ring.
Here is a close pic of my enlarged tbi:
http://img.photobucket.com/albums/v1...ounder/tbi.jpg
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