When converting to a solid flywheel, you must use the bolts supplied with the new flywheel. Torque the crankshaft bolts in a star pattern to 65 ft-lbs and the clutch bolts to 25 ft-lbs. When converting to the solid flywheel, a prop-shaft damper must also be installed on all applications except 2WD 15,000 GVW trucks with a prop-shaft brake. The purpose of the damper is reduce vibration due to added engine inertia resulting from the use of a solid flywheel.

For the damper on 2WD trucks without a prop-shaft brake, use GM part # 15664906. On 4WD applications, use # 15635329. When installing, use thread locking compound on the nuts and torque to 325 ft-lbs.

Additional detailed installation instructions are available in the GM bulletin # 66-72-02B.