2004-2006 GTO Harmonic Balancer/Underdrive Pulley

Free Shipping Price: $219.95 (USD)
Part #: 100226
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SLP's New 25% Underdrive Pulley / Harmonic Balancer for LS1 GTOs incorporates a number of high-quality features you won't find on any other aftermarket unit. Chief among them are a pair of extra-tall belt-retention walls that eliminate the belt-slippage issues endemic to other LS1 balancers. Other unique design strengths include 100% steel construction (other brands use steel and aluminum), integral timing marks, and built-in puller-mounting threads. Includes a new balancer bolt and detailed installation instructions.

NOTE: Requires 2 new belts (Dayco # 760K6 and # 405K4 or equivalent, not included). For GTOs only.

  • Extra-tall belt-retention "walls" no more thrown belts!
  • No aftermarket tensioner required
  • 100% steel construction
  • Integral timing marks and puller-mounting threads
  • Keyed for high-rpm or supercharged applications
  • Does not cause false knock retard or erratic power-curve dips
  • Includes a new balancer bolt
  • GTO - 2004, 2005, 2006
  • Tools: Shop Tools
  • Install Difficulty: Expert

SLP 100226 Underdrive Pulley/Harmonic Balancer Instructions