How do you change flywheel on Chevy truck 1991?

To change the flywheel on a 1991 Chevy truck, first, ensure the vehicle is safely lifted and supported. Disconnect the battery, then remove the transmission by unbolting it from the engine and separating it from the flywheel. Once the transmission is removed, unbolt the old flywheel from the crankshaft, install the new flywheel, and torque the bolts to the manufacturer's specifications. Finally, reassemble the transmission and reconnect the battery.