Yes, O ring was in place and intact, I used it for the new one and I just removed it, still in place on the new one
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2002 GTP coupe -- 2.9 pulley -- 2.25" IC -- N* TB -- Polished Gen V SC -- and more
1991 Trans Am WS6 -- 350 crate -- shift kit
2006 G6 GT Coupe -- Daily Driver