What Are Some Tips to Understanding Chevy Rear Axle Casting Numbers?


Quick Answer

The most direct way to identify Chevrolet axles by casting codes and visual identifiers is to use a differential identification tool such as DiffWizard.com or the casting decoder at TheCamaro.com. Casting numbers on older Chevrolet vehicles, especially muscle cars, can be decoded and include information such as production location, production date, differential gear ratio and carrier type. Chevrolet trucks of the same era and all Chevrolet vehicles manufactured after 1985 used a different casting number system.

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Full Answer

Newer Chevrolet vehicles have a tag listing manufacturing or production codes inside the glovebox or the driver's side door jamb as of 2015. These codes contain the same information as axle casting numbers. The label contains manufacturing codes for most parts of the vehicle, but codes beginning with the letters "G," "F" and "H" relate to the differential and axle, giving information such as final drive ratio, differential gear ratio and carrier type.

Neither the production codes nor the axle casting numbers directly identify the size of the Chevrolet axle in a vehicle. Differential identification tools, such as DiffWizard.com, narrow available options by year, make, model and vehicle drive type to provide effective visual cues to identify the axle. Differential cover bolts, the shape of the differential cover, bolt-in or c-clip axles and ring gear size are commonly used to identify Chevrolet axles.

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