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Re: 1991 K30 4l80E or NV4500 behind Cummins?
The 4500 came stock behind 94-up Cummins. I'm not sure a 4l80 can survive behind the 6BT, but IMO rather have the stick...save the t-case, it can be used behind it. The adapter is worth a small fortune...
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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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