Re: 5 speed or 6 speed.
I think the Getrag 5 speed that comes in the 88-up truck is a bolt in, but not 100%. Have to do some searching, it has been covered before. On CK5 too.
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2000 GMC CCSB 454/4L80 6” lift SAS
1999 Chevy CCSB 454/NV4500 6” lift
1999 GMC Yukon 350/4L60 4" SAS
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