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  1. Engine & Performance
    Hello, just wondering on your guys opinions on a gen 4 swap so i can use a 6l80 or just try to swap a 6l80 in on an 03 sierra, I'm sick and tired of having a 4l60 and I refuse to use a 4l80 because of the rather sickening gearing. I know there's that 6l80 harness from zero gravity performance...
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