What is a "heavy" car exactly? How about "high horsepower"?  My nearly-complete Dart 451, 4-speed has a back-braced 8-3/4" with a Dr. Diff 3.91 sure-grip pumpkin, and 295-50R15 street tires. We shall see... Your 8.75 will thank you for your tire choice. Like said before, if all you do is spin, you'll likely never break 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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