The underdrives will give you about .2-.3 in the quarter. Most guys here go with the Level 10 shift kit. On a stock truck, a chip will only benefit you with a removed speed limiter. The chip will boost the timing but you can do that yourself without a chip. If you ask most owners, a chip is worthless on a basically stock truck.
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Laurence Weiler
NLOC #339
12.78 @ 105.47MPH
