Harmonic Balancer/Underdrive Pulley

Price: $239.95 (USD)
Part #: 100230A
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Live in Canada? Place your order at 855-757-7373
SLP's 25% Harmonic Balancer / Underdrive Pulley corporates a number of high quality features you won't find on any other aftermarket unit and makes up to 4.9 additional rear wheel horsepower and 6.1 ft-lbs of rear wheel torque. Among these features are a pair of extra tall belt retention walls that eliminate the belt slippage issues common with other harmonic balancers. Other unique design strengths include a 100% steel construction (unlike other brands which use aluminum), integral timing marks and built in puller mounting threads. Includes new bolt and detailed installation instructions.

NOTE: Requires Two New Belts Not Included

2010-15 Camaro
Main Belt: Gates K060827 or 82.7" Equivalent
Accessory Belt: Gates K040353 or 35.3" Equivalent

4.8/5.3/6.0 Truck/SUV and TrailBlazer SS
Main Belt: Dayco 5060895 or 89.5" Equivalent (When the vehicle is equipped with an Overdrive Alternator, use Dayco 5060882 or 88.2" Equivalent).
Accessory Belt: Dayco 5040345 or 34.5" Equivalent.

Features:
  • Up to 4.9 Rear Wheel Horsepower Increase
  • Up to 6.1 ft-lbs. Rear Wheel Torque Increase
  • Extra-tall belt-retention "walls"-no more thrown belts!
  • 100% steel construction
  • Integral timing marks and puller-mounting threads
  • Does not cause false knock retard or erratic power-curve dips
  • Includes a new balancer bolt

Fitment:
  • 1999-2013 Escalade 6.2L
  • 2010-2015 Camaro L99/LS3
  • 1999-2007 Silverado/Sierra/Classic/SUV 4.8/5.3/6.0
  • 2007-2013 Silverado/Sierra/Tahoe/Escalade
  • 2006-2009 Trailblazer SS
  • Camaro V8 L99/LS3 - 2010, 2011, 2012, 2013, 2014, 2015
  • Silverado - 4.8L, 5.3L, 6.0L, 6.2L V8 - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
  • Sierra - 4.8L, 5.3L, 6.0L, 6.2L V8 - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
  • Tahoe 4.8L, 5.3L, 6.2L V8 - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
  • Avalanche - 5.3L, 6.0L V8 - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
  • Suburban - 5.3L, 6.0L, 6.2L V8 - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
  • Denali - 5.3L, 6.0L, 6.2L V8 - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
  • Yukon - 4.8L, 5.3L, 6.2L V8 - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
  • Trailblazer SS - 2006, 2007, 2008, 2009
  • Escalade 6.0L, 6.2L V8 - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
  • Install Hours: 2.5
  • Tools: Shop Tools
  • Install Difficulty: Intermediate

SLP 21145A Harmonic Balancer/Underdrive Pulley Instructions