it really depends on engine combo. if you build a big horse motor with a bunch of camshaft (like most of us do), the last thing you want is being in overlap at highway speeds. RE: turning to few RPMs. Even with a 3.73 a engine can be turning to low for a 6 speed. The .064 is plenty enough, the TKO is smaller to package, lighter, and stronger then a NONE Viperized unit, and the Viperized unit is way more money.
So we use TKOs.
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