GM RPO Codes, or General Motors “Regular Production Option” codes contain lots of valuable information about your GM vehicle. Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box. (Accurate identification using the GM RPO code assumes that the rear end has not been previously modified) The prefix is usually F, G or H when referring to Axle Identification. The list below is a partial list of typical GM RPO Codes, specifically the codes pertaining to Axle Identification, Differential Type and Gear Ratio.
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Do you have a custom width or hard to find axle housing? West Coast Differentials offers universal cut-to-fit axle shafts for multiple applications including 9” Ford, Dana 44, Dana 60 and 8.75” Chrysler. These are available for both stock and custom spline applications, and feature stock replacement or chromoly material.
West Coast Differentials’ cut-to-fit axles feature longer splines, up to 11” so the axle can be measured and cut-to-fit most stock and narrowed rear ends. These versatile axles are also multi-drilled for different bolt patterns. With the correct housing ends, these axles can be used for a wide variety of custom or stock differentials.
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