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Will a 1988 Cheyenne vacuum shift transmission fit an Silverado electric truck?

No, a 1988 Chevrolet Cheyenne's vacuum-shifted transmission will absolutely not fit a Silverado electric truck. Electric vehicles don't have transmissions in the traditional sense. They have a single-speed reduction gear (or in some cases, a multi-speed transmission but still vastly different from a 1988 mechanical transmission) that's directly connected to the electric motor. There's no place to mount or connect a vacuum-shifted automatic transmission to an electric drivetrain. The entire drivetrain architecture is fundamentally different.