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The helix adds more aggressive shift to the secondary clutch which gives you big acceleration gains and feels more like your throttle is locked to the rear wheels
We do not suggest having this installed if you plan on going in water holes over 2ft deep
RACE-TESTED DURABILITY AND CONSTRUCTION
500+ more RPM's
USB cable not included
Rear Coil Springs 97-06 Wrangler TJ 4 Inch (LJ-1/2 Inch ) Pair RockJock 4x4 0450 The helix adds more aggressiveRockJock's 4 inch lift rear coil springs for 1997 2006 Jeep TJ Wranglers and LJ Unlimiteds replace factory springs and are designed to work with RockJock Johnny Joint suspension systems or other manufacturer's 3 to 5 inch lift kits. This pair is our increased rate rear springs for improved ride quality and height control when the vehicle is carrying a little extra weight (ice chest, tools etc.) These springs feature a dual rate with a combined rate of
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