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Re: 1977 Silverado Crew Cab.
based on my experience with the 6.0 in a 3/4t pickup, you might as well just go for the 8.1 and have all the power you could need!
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1999 GMC Suburban K2500 SLT, 454/4L80E
1991 Z/28, 6.0L/T56
1949 GMC 250, S10 Frame, 6.0L/4L80E
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