Homeβ€Ί Engine > Valve Train Componentsβ€Ί INA ZS-2551 Engine Balance Shaft Gear
Part #: ZS-2551

INA ZS-2551 Engine Balance Shaft Gear

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INA ZS-2551 Engine Balance Shaft Gear

The INA ZS-2551 engine balance shaft gear is built for OE-style timing system service on a wide range of GM V6 applications. It is a direct-fit driven gear for balance shaft and valve train-related repair work where accurate gear engagement matters.

Compatible with Buick, Chevrolet, Oldsmobile, and Pontiac applications across 1988-2009 model years, this part is commonly searched as an INA balance shaft gear for Buick LeSabre, Regal, Park Avenue, and Riviera, as well as Chevrolet Impala and Monte Carlo service repairs.

  • Engine balance shaft gear for timing system repair
  • INA part number ZS-2551
  • OE-quality construction using powdered metal, steel, or cast iron materials
  • Heat-treated to exact hardness specifications
  • Driven gear application for listed GM engines
  • Cross-reference: 5540303100

Application Details

Fits 2005-2009 Buick Allure, N/A; 2005-2009 Buick LaCrosse, N/A; 2006-2008 Buick Lucerne, N/A; 1997-2008 Pontiac Grand Prix, N/A; 1996-2005 Buick LeSabre, N/A; 1996-2005 Buick Park Avenue, N/A; 1995-2005 Buick Park Avenue, N/A; 2000-2005 Chevrolet Impala, N/A; 2004-2005 Chevrolet Impala, N/A; 2004-2005 Chevrolet Monte Carlo, N/A; 1998-2005 Chevrolet Monte Carlo, N/A; 1992-2005 Pontiac Bonneville, N/A; 1997-2004 Buick Regal, N/A; 1990 Buick Regal, N/A; 1996-2004 Buick Regal, N/A; 1995-2002 Chevrolet Camaro, N/A; 1995-2002 Pontiac Firebird, N/A; 1996-1999 Buick Riviera, N/A; 1988-1990 Buick Riviera, N/A; 1998-1999 Chevrolet Lumina, N/A; 1992-1999 Oldsmobile 88, N/A; 1998-1999 Oldsmobile Intrigue, N/A; 1996-1999 Oldsmobile LSS, N/A; 1997-1998 Oldsmobile Regency, N/A; 1995-1997 Buick Riviera, N/A; 1995-1996 Oldsmobile 98, N/A; 1991 Oldsmobile 98, N/A; 1991-1995 Buick LeSabre, N/A; 1991-1995 Buick Park Avenue, N/A; 1991-1995 Buick Regal, N/A; 1995 Buick Riviera, N/A; 1991-1993 Buick Riviera, N/A; 1992-1994 Pontiac Trans Sport, N/A; 1991 Buick Reatta, N/A; 1988-1991 Oldsmobile Delta 88, N/A; 1988-1990 Buick LeSabre, N/A; 1988-1990 Buick Reatta, N/A; 1988-1990 Oldsmobile 98, N/A; 1988-1990 Oldsmobile Toronado, N/A.

What This Part Helps Address

  • Worn or damaged balance shaft gear teeth
  • Timing system noise caused by gear wear
  • Incorrect gear engagement in driven applications
  • Repair needs on GM V6 engines with listed fitment
  • Service replacement for an INA 554 0303 100 application

Installation Notes

Verify engine code and application notes before ordering, especially L27, L36, and L67 references and single-bolt cam notes where listed. This part is used in driven balance shaft applications, so proper timing alignment and inspection of related components are important during installation.

Quality Assurance

INA timing gears and sprockets are manufactured to OE-level standards using controlled materials and heat treatment for consistent hardness and performance. The ZS-2551 is engineered as a precision replacement for the listed GM applications.

This part fits 192 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2009BuickAllure3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2009BuickLaCrosse3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2008BuickAllure3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2008BuickLaCrosse3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2008BuickLucerne3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2008PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
2007BuickAllure3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2007BuickLaCrosse3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2007BuickLucerne3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2007PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
2006BuickAllure3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2006BuickLaCrosse3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2006BuickLucerne3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2006PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
2005BuickAllure3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2005BuickLaCrosse3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2005BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2005BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
2005BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2005ChevroletImpala3.8LV6N/AINA Global Number 554 0303 100; Driven
2005ChevroletImpala3.8LV6N/AINA Global Number 554 0303 100; Driven; L67 Eng.
2005ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven; L67 Eng.
2005ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven
2005PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
2005PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
2004BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2004BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2004BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
2004BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
2004BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2004ChevroletImpala3.8LV6N/AINA Global Number 554 0303 100; Driven
2004ChevroletImpala3.8LV6N/AINA Global Number 554 0303 100; Driven; L67 Eng.
2004ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven; L67 Eng.
2004ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven
2004PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
2004PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
2003BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2003BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
2003BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2003BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2003BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
2003ChevroletImpala3.8LV6N/AINA Global Number 554 0303 100; Driven
2003ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven
2003PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
2003PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
2002BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2002BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2002BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
2002BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
2002BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2002ChevroletCamaro3.8LV6N/AINA Global Number 554 0303 100; Driven
2002ChevroletImpala3.8LV6N/AINA Global Number 554 0303 100; Driven
2002ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven
2002PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
2002PontiacFirebird3.8LV6N/AINA Global Number 554 0303 100; Driven
2002PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
2001BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2001BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2001BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
2001BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2001BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
2001ChevroletCamaro3.8LV6N/AINA Global Number 554 0303 100; Driven
2001ChevroletImpala3.8LV6N/AINA Global Number 554 0303 100; Driven
2001ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven
2001PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
2001PontiacFirebird3.8LV6N/AINA Global Number 554 0303 100; Driven
2001PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
2000BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2000BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2000BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
2000BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
2000BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
2000ChevroletCamaro3.8LV6N/AINA Global Number 554 0303 100; Driven
2000ChevroletImpala3.8LV6N/AINA Global Number 554 0303 100; Driven
2000ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven
2000PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
2000PontiacFirebird3.8LV6N/AINA Global Number 554 0303 100; Driven
2000PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
1999BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1999BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
1999BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1999BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1999BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
1999BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven
1999ChevroletCamaro3.8LV6N/AINA Global Number 554 0303 100; Driven
1999ChevroletLumina3.8LV6N/AINA Global Number 554 0303 100; Driven
1999ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven
1999Oldsmobile883.8LV6N/AINA Global Number 554 0303 100; Driven
1999OldsmobileIntrigue3.8LV6N/AINA Global Number 554 0303 100; Driven
1999OldsmobileLSS3.8LV6N/AINA Global Number 554 0303 100; Driven
1999PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
1999PontiacFirebird3.8LV6N/AINA Global Number 554 0303 100; Driven
1999PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
1998BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1998BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1998BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
1998BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
1998BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1998BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven
1998ChevroletCamaro3.8LV6N/AINA Global Number 554 0303 100; Driven
1998ChevroletLumina3.8LV6N/AINA Global Number 554 0303 100; Driven
1998ChevroletMonte Carlo3.8LV6N/AINA Global Number 554 0303 100; Driven
1998Oldsmobile883.8LV6N/AINA Global Number 554 0303 100; Driven
1998OldsmobileIntrigue3.8LV6N/AINA Global Number 554 0303 100; Driven
1998OldsmobileLSS3.8LV6N/AINA Global Number 554 0303 100; Driven
1998OldsmobileRegency3.8LV6N/AINA Global Number 554 0303 100; Driven
1998PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
1998PontiacFirebird3.8LV6N/AINA Global Number 554 0303 100; Driven
1998PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
1997BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1997BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1997BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
1997BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
1997BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1997BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1997BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven
1997ChevroletCamaro3.8LV6N/AINA Global Number 554 0303 100; Driven
1997Oldsmobile883.8LV6N/AINA Global Number 554 0303 100; Driven
1997OldsmobileLSS3.8LV6N/AINA Global Number 554 0303 100; Driven
1997OldsmobileRegency3.8LV6N/AINA Global Number 554 0303 100; Driven
1997PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
1997PontiacFirebird3.8LV6N/AINA Global Number 554 0303 100; Driven
1997PontiacGrand Prix3.8LV6N/AINA Global Number 554 0303 100; Driven
1996BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1996BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1996BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven
1996BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1996BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven
1996BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1996ChevroletCamaro3.8LV6N/AINA Global Number 554 0303 100; Driven
1996Oldsmobile883.8LV6N/AINA Global Number 554 0303 100; Driven
1996Oldsmobile983.8LV6N/AINA Global Number 554 0303 100; Driven
1996OldsmobileLSS3.8LV6N/AINA Global Number 554 0303 100; Driven
1996PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
1996PontiacFirebird3.8LV6N/AINA Global Number 554 0303 100; Driven
1995BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1995BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1995BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1995BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1995BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1995BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven; L27, L36 Eng.
1995ChevroletCamaro3.8LV6N/AINA Global Number 554 0303 100; Driven
1995Oldsmobile883.8LV6N/AINA Global Number 554 0303 100; Driven
1995Oldsmobile983.8LV6N/AINA Global Number 554 0303 100; Driven
1995PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
1995PontiacFirebird3.8LV6N/AINA Global Number 554 0303 100; Driven
1994BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1994BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1994BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1994Oldsmobile883.8LV6N/AINA Global Number 554 0303 100; Driven
1994PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
1994PontiacTrans Sport3.8LV6N/AINA Global Number 554 0303 100; Driven
1993BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1993BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1993BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1993BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1993Oldsmobile883.8LV6N/AINA Global Number 554 0303 100; Driven
1993PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
1993PontiacTrans Sport3.8LV6N/AINA Global Number 554 0303 100; Driven
1992BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1992BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1992BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1992BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1992Oldsmobile883.8LV6N/AINA Global Number 554 0303 100; Driven
1992PontiacBonneville3.8LV6N/AINA Global Number 554 0303 100; Driven
1992PontiacTrans Sport3.8LV6N/AINA Global Number 554 0303 100; Driven
1991BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1991BuickPark Avenue3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1991BuickReatta3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1991BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1991BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven; Eng. L27, L67 - Single Bolt Cam
1991Oldsmobile983.8LV6N/AINA Global Number 554 0303 100; Driven
1991OldsmobileDelta 883.8LV6N/AINA Global Number 554 0303 100; L36
1990BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven
1990BuickReatta3.8LV6N/AINA Global Number 554 0303 100; Driven
1990BuickRegal3.8LV6N/AINA Global Number 554 0303 100; Driven
1990BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven
1990Oldsmobile983.8LV6N/AINA Global Number 554 0303 100; L36
1990OldsmobileDelta 883.8LV6N/AINA Global Number 554 0303 100; L36
1990OldsmobileToronado3.8LV6N/AINA Global Number 554 0303 100; L36
1989BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven
1989BuickReatta3.8LV6N/AINA Global Number 554 0303 100; Driven
1989BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven
1989Oldsmobile983.8LV6N/AINA Global Number 554 0303 100; L36
1989OldsmobileDelta 883.8LV6N/AINA Global Number 554 0303 100; L36
1989OldsmobileToronado3.8LV6N/AINA Global Number 554 0303 100; L36
1988BuickLeSabre3.8LV6N/AINA Global Number 554 0303 100; Driven
1988BuickReatta3.8LV6N/AINA Global Number 554 0303 100; Driven
1988BuickRiviera3.8LV6N/AINA Global Number 554 0303 100; Driven
1988Oldsmobile983.8LV6N/AINA Global Number 554 0303 100; L36
1988OldsmobileDelta 883.8LV6N/AINA Global Number 554 0303 100; L36
1988OldsmobileToronado3.8LV6N/AINA Global Number 554 0303 100; L36

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

5540303100

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.