How to Find the Axle Ratio for a 2003 GMC Sierra

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The 2003 GMC Sierra features four-wheel, anti-lock disc brakes, front airbags, auxiliary power outputs, dual-zone air conditioning, split bench seats and power steering. Optional engines for the 2003 model year include the 4.8 and 5.3-liter V-8, while base "work truck" models come with a 4.3-liter Vortec V-6. Finding the correct gear ratio information for your vehicle's transmission and axle differential may prove useful when calibrating the speedometer for larger tires or ordering replacement parts relating to the drivetrain.

  • Open the glove compartment of your Sierra. Locate the option code sticker mounted inside the glove box. The option code sticker contains a series of three-digit "RPO" codes that identify certain options installed on your vehicle.

  • Write down each code on the sticker that begins with an "F", "G" or "H." Two-wheel drive vehicles may only have one axle code listed while vehicles with four-wheel drive will have two or more RPO codes.

  • Open a browser and navigate to the GM axle code Web page at Drivetrain.com (see Resources). Look in the right column and locate the axle ratio for your vehicle's specific RPO codes listed. Alternatively, you may contact the service department at a local GMC dealership, provide the RPO codes to a customer service representative and ask for information relating to the vehicle's axle ratio.

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