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Re: 5 speed or 6 speed.
Not a real big diff going from 3.73 to 4.10s. Look in glovebox or under the hood for the PRO codes. Some came with 3.42s. but probly has less than that...
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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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