building 5.3
10-03-2012, 10:13 AM
#32
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4.56 all day long with a 4l60E and if you want more response down low 4.88. The rpm difference b/t 4.10 and 4.56 at 70mph is only like 250-350, not enough to cry about at the pump.
Last edited by tcr0148; 10-03-2012 at 10:23 AM.
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