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The Pontiac Grand Prix Harmonic Balancer protects the crankshaft from twisting vibrations so that the engine remains smooth and long lasting. Celebrated since 1962, Pontiac Grand Prix earned a reputation for blending muscle and comfort, punchy V6, even 5.3L V8 power, responsive steering, roomy cabins, sharp styling and dependable front wheel drive that handles daily commutes or spirited highway runs with equal ease. Owners love the fact that the Grand Prix gets the optimal of both sporty acceleration and practical seating for five, but the Pontiac parts make these cars reliable decades after production ended. The evolution of the model from sleek performance coupe to sedate sedan demonstrates Pontiac's commitment to driver focused design, with options such as sport tuned suspension, 18 inch alloy wheels, and modern safety tech to help the Grand Prix be competitive in changing markets. At the core of that reliability is the Harmonic Balancer, a metal hub bonded to a rubber ring that counteracts torsional shake which can cause parts to be shaken loose and crankshaft fatigue (standard units are matched to factory specs, with upgraded units available for high RPM builds). Because heat and oil eventually hardens the rubber, routine checking and timely replacement of the Harmonic Balancer is necessary to keep vibration in check and keep timing marks accurate for easy tuning. To install one, disconnect the battery, remove the belt and crank pulley, remove the old part with a puller, press on the new Harmonic Balancer using an installer tool, torque the bolt correctly, refit parts, and make sure it idles easily.