faisal Posted February 28, 2009 Posted February 28, 2009 as in the title..im buying a 2009 sierra CCSB 5.3 6spd 6l80 SLE1<<this one got nothing to do with the tranny and 4WD Z71 HOW MUCH CAN MY TRANNY AND TRANS CASE HOLD OF HP?? ARE THE NEW 6L80 BETTER THAN THE OLD 4L60S OR IS IT THE SAME ...PERFOMANCE WISE...IM PLANING 400 WHP IF THE MONEY CAME TO ME so and i DONT want a link to any topic excpet ppl that have tryed it
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