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A boost gauge was added to the gauge pack to help track atmospheric pressure under the blower. The ZL1’s six-speed manual trans is a tricked-out version of the Tremec TR6060 found in the SS. It features a stronger output shaft, an additional mainshaft roller bearing, refined synchos, and a GM-designed short-throw shifter. Mating the trans to the blown LS engine is a twin-disc clutch with a dual-mass flywheel.