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Hey calling all gear heads, my rear end cratered on the 97 Z71 and I have a free rear end if it's the same ratio as mine. I have 3.42's but don't know the ratio of the donor. It has GMK17 on the outside axle tube and is from a '92 4x4. I can't find info for an ID except for the RPO #'s on the glove box sticker, which the donor doesn't have. I do have another unit found that is from a '98 that is the same ratio but is $450 if this one isn't the same. The 450 bucks is still cheaper than having my old one rebuilt. It's all fun!
 

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Bird, check for a metal tag that is held on by 2 of the bolts on the diff. cover. Last time I changed one that is were it was located, you may have to take a wire brush and some solvent to clean it up so you can read it.
 

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Yep Farmboy is dead on..If that doesn't work you need to count the teeth on the ring and pinion gears.. Then divide the number of teeth on the ring gear into the number of teeth on the pinion gear.. that should get ya the gear ratio.
 

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And without pulling and looking at gears, you can jack up the axle, mark the drive shaft with a grease pencil or Sharpie, and count the number of times the drive shaft rotated per one tire revolution.
 
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