The 4.08's help with the 1/4 mile time but it takes some adjustments to really get the most out of it. Launching was slightly different and took a few passes to find the right sweet spot again. Also the faster rev'ing of the engine requires some adjusting for gear changes. I found myself shifting too soon the first several passes and netting a lower trap speed than with stock gears. Sticky tires are a must, especially with the upgraded gears.
I can't really say exactly how much ET and trap speed was attributed to the gears because of the different mods I've done. But I'll say this much:
stock (on a really good night): 13.1 @ 105 mph w/ 1.89 60ft
4.08's + a few bolt-on's (on a warm night) = 12.8 @ 109 mph w/ 1.92 60ft
With that said, I like the 4.08's more for street driving than for 1/4 mile racing. The really wake up the car, makes it way more fun to run through the gears.
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