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O wise ones, I've just installed a Sure-Grip pumpkin in my 1970 8.75 rear end. (had a non-Sure Grip before -- both are 741s) I HAVE installed the pinion thrust spacer as well. The right side axle (with the threaded adjuster) adjusts end play beautifully. The left side (no adjuster) has...

70 Dart, mildly warmed up 318, MAYBE 300 hp is the plan. Automatic, 2000 stall. 3.91 rear ratio. Do I NEED Sure-Grip? Would it FRY one tire, or just spin a bit and then go? I'm thinking about putting an open carrier in first, and then just SEEING how it works out. I do know of an...