INA ZS-2558 Engine Balance Shaft Gear

INA Engine Balance Shaft Gear ZS-2558

INA ZS-2558 is an engine balance shaft gear for select GM vehicles with compatible V6 applications. Built to OE-quality standards, it uses precision materials and heat treatment to support accurate timing gear operation in the valve train.

Key Features

• Engine balance shaft gear for the valve train
• OE-quality replacement from INA
• Made from powdered metal, steel, or cast iron depending on application design
• Heat treated to exact hardness specifications
• Cross-references INA Global Number 554 0314 100
• Part number: ZS-2558

Detailed Description

INA ZS-2558 is a timing gear/sprocket component used in balance shaft drive systems where precise gear engagement is critical. It is engineered for direct replacement use on select Buick, Chevrolet, Oldsmobile, and Pontiac models, including applications such as Buick Regal, Buick LeSabre, Chevrolet Impala, Pontiac Grand Prix, and Pontiac Bonneville. This part number, ZS-2558, is listed for driver-side applications across multiple 3.8L-era GM platforms, with fitment notes that vary by engine code and design revision.

This part cross-references INA Global Number 554 0314 100 for the same application.

What It Is Used For

• Restoring balance shaft gear engagement in the engine
• Replacing worn or damaged timing gear teeth
• Addressing noise from gear wear or timing irregularity
• Correcting drivability issues tied to balance shaft drive wear
• Supporting proper engine timing component alignment

Installation Notes and Tips

Verify engine code, design revision, and driver-side fitment before ordering. This gear is listed for multiple years of Buick, Chevrolet, Oldsmobile, and Pontiac vehicles, including 1988-2009 applications, but the notes differ by model and engine family. Compare the existing gear to the OE reference and confirm the raised circular surface design where specified. Professional installation is recommended because timing-related components require accurate alignment and inspection of related wear items.

Quality Assurance

INA timing gears and sprockets are manufactured to meet or exceed OE quality and performance expectations. The brand uses high-grade powdered metal, steel, or cast iron construction and heat treats components to exact hardness specifications for consistent durability.

• Fits 2005-2009 Buick Allure, driver side
• Fits 2005-2009 Buick LaCrosse, driver side
• Fits 2006-2008 Buick Lucerne, driver side
• Fits 1997-2008 Pontiac Grand Prix, driver side
• Fits 1996-2005 Buick LeSabre, driver side
• Fits 1996-2005 Buick Park Avenue, driver side
• Fits 1995-2005 Buick Park Avenue, driver side
• Fits 2000-2005 Chevrolet Impala, driver side
• Fits 2004-2005 Chevrolet Impala, driver side
• Fits 2004-2005 Chevrolet Monte Carlo, driver side
• Fits 1998-2005 Chevrolet Monte Carlo, driver side
• Fits 1995-2005 Pontiac Bonneville, driver side
• Fits 1997-2004 Buick Regal, driver side
• Fits 1996-2004 Buick Regal, driver side
• Fits 1995-2002 Chevrolet Camaro, driver side
• Fits 1995-2002 Pontiac Firebird, driver side
• Fits 1996-1999 Buick Riviera, driver side
• Fits 1998-1999 Chevrolet Lumina, driver side
• Fits 1996-1999 Oldsmobile LSS, driver side
• Fits 1995-1997 Buick Riviera, driver side
• Fits 1995 Oldsmobile 88, driver side
• Fits 1995 Oldsmobile 98, driver side
• Fits 1988-1991 Oldsmobile Delta 88, driver side
• Fits 1988-1990 Oldsmobile 98, driver side
• Fits 1988-1990 Oldsmobile Toronado, driver side