A 2.1 60 foot with street tires and 3.73s is a really good time.
When I went to 3.73s with my street Gatorbacks, the best I could muster was around a 2.2. (I think I got a 2.17 once or twice...)
The best shift point on a stock early model modular GT is right around 5500 rpm. Any more and you linger in that part of the power band that just plain stinks....
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