We stock a complete line of OEM and aftermarket parts for GM Axles & Differentials. Let our LIVE parts experts take the guesswork out of your project! The list below is a partial list of typical GM RPO Codes, specifically the codes pertaining to Axle …

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To find the axle gear ratio of any GM vehicle, locate the RPO sticker (typically located in the glove box) and write down any codes starting with F, G, or H. Then, find those codes in the table below. These RPO codes are used to idicate a specific type of differential and/or ring gear size.

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Sep 25, 2019 · The axle ratio GMC installs in a Sierra is picked specifically to deliver good all around performance with a certain tire height. Changing the tire height by going bigger changes the effective axle ratio and causes the stock gearing to act like a higher gear – …

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