97 z71 k1500 rear diff

What are the diffenent sizes and gear ratios available on this model year truck. thanks

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It could be a GU6 (3.42) and GT4 (3.73) or a GT5 (4.10). You can find a complete list of GM axle ratio codes that I put together at the link below. (it covers basically all GM vehicals)
http://forum.snoman.com/viewtopic.php?t
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