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I have a 2004 Colorado 4x4 Z71 and I upgraded the rear axle to the 4.10 ratio from 3.73. Instead of re-gearing the front differential, I figured it would be cheaper to get a 4.10 front differential out of a junkyard truck. There are a few near me for a 2005 Colorado. I'm pretty sure that should work fine but I'd figure I'd check before driving 100 miles to go get it.