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Old 06-05-2013, 05:00 PM   #2

GretchenGotGrowl's Avatar
Drives: 11 F150 EB/13 Sonic RS/15 Z06
Join Date: Sep 2010
Location: Little Rock, AR
Posts: 7,133
Everything I've seen is it is a constant proportion. If it was 20% stock it will be 20% when modded unless you change something about the drivetrain. A more effecient tranny or differential (lighter components) can reduce the percentage.
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