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These are the FOX 2.5 Factory Series Reservoir Rear Shocks w/ DSC (Dual Speed Compression) Adjustable shocks to fit the Rear of your 2007-2018 Jeep Wrangler JK with a 2.5 inch to 4 inch lift installed. Fitment: 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
Fox Means Shocks. Ever since 1974, when Bob Fox designed his own motocross racing shocks, the Fox name has meant the best in off-road suspension. The Fox Factory series carries on Bob Fox's tradition of development through racing. The external reservoir of the Fox Factory Series keeps oil temperature stable through the most intense use imaginable. It also enables field maintenance and tuning that would otherwise be impossible. Fox Factory Series is the shock for extreme off-road handling and durability.
Built to Take It. Every part of the Fox Factory Series is enhanced for severe use: from a honed and seamless body to the CNC-machined billet aluminum components to an over sized 7/8 inch shaft of head-treated alloy steel. These shocks have everything you need for low-speed rock crawling or high-speed desert runs. Race-bred Fox technology shows through in every detail.
Tuned for Your Ride. Each Fox Factory shock is tuned for a specific application. Valving is set from the factory for optimal ride and stability. Your wheels will stay in maximum contact with the ground for enhanced traction and control. User-accessible adjustments for fine-tuning include nitrogen pressure, compression valving, and rebound valving.
Installation. If you have a well-equipped garage, a spring compressor, access to a lift, and some mechanical experience, these are user-installable. Otherwise, leave it to your local expert technician.
How Fox DSC Dual Speed Compression Adjusters Work:
Fox calls their adjuster a Dual Speed Compression (DSC) adjuster because it has separate knobs for low speed and high-speed adjustments. Fox DSC Compression adjuster(s) can change the valving and are a great improvement to your off-road shocks because you’ll be able to quickly make adjustment and fine tune your ride comfort and performance. When it comes to shock tuning they will save you countless hours and greatly improve your results.
Fox compression adjusters have three flow paths: low speed free bleed, a high-speed disk stack, and a rebound check valve. The Fox Low Speed Compression circuit works by using a needle and seat to change oil flow through the free bleed path. The Fox High Speed Compression Adjuster circuit uses deflective disks to control flow. The high-speed circuit is externally adjustable and works by increasing preload on deflective disks. The rebound check valve allows oil to easily return to the shock when the shaft extends.
Fox Compression adjusters have a substantial range of adjustment that can transform your vehicle from a Cadillac to a race car. The Fox low speed adjustment range is huge and can add between 120% (solid axle) more low speed load depending on vehicle/tune. The high-speed adjuster can add between 30% and 60% more high speed force depending on vehicle/tune.
The Fox Low Speed Compression adjustment give you the ability to find the optimal tradeoff between ride, handling and bottoming control. The Fox Low Speed Compression Adjuster has a large usable range and give each click an appropriate amount of adjustment. The Fox DSC Adjuster has 9 low speed clicks. While adjustments do spill over into high speed, the percentage change is heavily weighted towards low speed.
The separate Fox High Speed Compression adjuster gives you a dedicated adjustment for tuning on whoops and high-speed hits. The adjuster has 11 clicks and offers a great range of adjustability which has almost no impact on low speed compression.
There are many other lesser known benefits of compression adjusters that improve the performance of your shocks such as increased damping, better cooling and more consistency.
Compression adjusters are basically a second damping piston which works off the displacement of the piston rod and meters oil flow into the reservoir. By adding a second damping piston the damping area and damping force are automatically increased. This is important for 2.0 shocks on solid axles can run out of damping force. Because the compression adjuster piston is located next to the reservoir it does a better job putting heat into the oil where it is more easily cooled. Finally, the compression adjuster piston significantly reduces the ability for the shock to cavitate and loose damping. Small amounts of oil can easily flow into the reservoir, but compression adjusters generally don’t flow large amounts of oil well, meaning they’re forced through the main piston, making it do its job. These benefits by themselves are often worth adding a compression adjuster to your shocks.
The Fox DSC Adjusters really work and are an excellent choice if you’re changing weight, changing terrain, or want the best possible ride.