axle gear ratio
2 Answers
Check your glove box, there will be a sticker, with a list of RPO codes. These three digit alpha-numeric "Repair Parts Ordering" codes show what the vehicle came with, from the factory. Z71 is a famous RPO code for chevy off-road trucks. The point is, your vehicle will literally tell you your exact diff size, for your truck, if you know where to look. Most Chevy Forums siwes have a list of these codes and their meaning, While 373 is a popular differential size for the Blazer, your truck may have been provided with a different sized gearing, depending upon what other options came with the truck.
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