FWIW I still have the stock shafts in the 727 in my cuda. It's over 3800 lbs and ran mid 9s NA from 2006-2015 w/ no trouble. Been running 8s on nitrous ever since. I don't race it very often though. From what others have experienced, it wouldn't surprise me if it snapped something the next time I ran it.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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