Get new tires and it should take more throttle to chirp em. My old DD was a 2005 Trailblazer (4L60E) with a TransGo HD2 shiftkit, vette servo and .500 inch boost valve and half throttle would chirp brand new tires. Full throttle was a spin through 2nd gear and that was with stock 3.42 gears.
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"Quality means doing it right when no one is looking."
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