Gear ratio check
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==Overview== | ==Overview== | ||
Methods to determine the gear ratio of the differential | Methods to determine the gear ratio of the differential | ||
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| + | ==Codes== | ||
| + | Axle codes are helpful for showing what was originally installed in a vehicle. But be aware the ratio could have been changed, so the best way is to physically verify. | ||
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| + | ===RPO codes=== | ||
| + | Most later model vehicles will have an RPO sticker somewhere in the vehicle. Some common places are under the trunk lid, in the glovebox, or in the console. | ||
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| + | Look for codes having a "G" or "H" prefix. More codes '''[http://www.crankshaftcoalition.com/wiki/GM_RPO_build_codes#MORE_RPO_CODES: here]'''. | ||
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| + | ===Axle codes=== | ||
| + | GM axles are stamped on the axle tube with codes for the year and ratio. Sometimes the casting numbers can also be used to show whether an axle housing is a limited slip differential (LSD) or not. | ||
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| + | Ford rear ends sometimes had tags under one of the carrier bolts that had the ratio and a code for being a LSD or not. Ford also used an axle code on the body tag on some models. | ||
==Counting the teeth on ring and pinion== | ==Counting the teeth on ring and pinion== | ||
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