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Re: Original configuration of a 72 K20
44 front Eaton rear, could be a Dana 60, don't know why one over the other....ratios, just guessing but 3.73 up to 4.56s...
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2000 GMC CCSB 454/4L80 6” lift SAS
1999 Chevy CCSB 454/NV4500 4” SAS
1999 GMC Yukon 350/4L60 6" SAS
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