11.40s at 3700# broke the 8.75 suregrip. Upgraded to a spool and 35 spline axles.
When I put the Indy headed 440 in the car, the 8.75 sheared the teeth off the pinion and got some of the ring gear at 10.70s at 3700# while trying to sort out the new combo. After that, I put the Dana in and wound up going 10.40s all sorted out.
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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