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on average 3.73's will knock off 5-7 tenths and add .75-1.1 mph. most people over look it, but i woudl suggest doing something to firm up the shifts a bit if you want to go to the bigger gears. the LT1 computer is a little bit slower to send the shift command than the later computers and even with a proper tune to account for it, the engine will often tap the rev limiter simply because the mechanical side of the shift is too soft.
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