Most FOX Performance Elite shocks and many Factory Race kits carry a DSC adjuster: two knobs on the reservoir that set compression damping. DSC stands for Dual Speed Compression. It is the reason to choose an Elite or Factory Race shock if your truck's weight changes a lot, for example running empty during the week and carrying a camper, a heavy trailer tongue or a full overland load at the weekend. This guide explains what the two knobs do, where FOX says to start, and which FOX parts have DSC.
Low-speed vs high-speed compression
"Speed" here means how fast the shock shaft moves, not how fast the truck is going. FOX says DSC lets you tune high-speed and low-speed compression separately.
- Low-speed compression (LSC) controls slower shaft movement: body roll in corners, brake dive, the slow pitch of a loaded truck, and the sway from a trailer or camper.
- High-speed compression (HSC) controls fast hits: potholes, sharp rocks, washouts and square-edged bumps, where the wheel has to move up quickly.
Adding compression damping (turning clockwise) makes the shock move more slowly: firmer, with more support. Removing it (counter-clockwise) lets the shock move faster: softer, with more compliance. FOX's video on tuning DSC adjusters covers handling, weight changes and bottoming out.
FOX's factory setting
FOX's starting point for DSC is three clicks from fully open on both knobs. It recommends this for most vehicles; the exceptions are listed in the owner's manuals. FOX's engineers tune the shim stacks inside the shock with DSC at that setting, so there is always room to go softer or firmer from there. To set it on all four shocks:
- Turn the LSC knob counter-clockwise until it stops. This is fully open.
- Turn the HSC knob counter-clockwise until it stops. The LSC knob turns with it; that does not change the LSC setting.
- Turn the LSC knob clockwise three clicks. FOX says an LSC click is a detent about every 120 degrees, not a full turn.
- Turn the HSC knob clockwise three clicks. An HSC click is about every 90 degrees.
FOX's DSC guide describes 10 clicks of low-speed and 12 clicks of high-speed adjustment. If your part's manual gives a different range, the manual wins.
Tuning from there
FOX encourages owners to move beyond the factory setting, and says it is normal to keep a few settings, for example one for commuting, one for trail driving and one for camping with family and gear. FOX's rules:
- The two front shocks should always have the same settings, and the two rear shocks the same, so the truck stays balanced from side to side.
- Front and rear settings can differ from each other.
A practical habit, not a FOX rule: change one knob a click or two at a time, write down where you are, and drive the same piece of road again before the next change.
For a tow rig or camper hauler, the usual approach is to set the truck up loaded, then back off when it runs empty. If the loaded truck wallows or leans, add LSC. If it crashes through sharp bumps or bottoms out, add HSC. If the ride is harsh on small bumps, take some out. These are general tuning principles. Your FOX manual is the reference for your part.
DSC EVO
FOX's newer kits use DSC EVO. FOX says it adds Variable Valve Control (VVC) on the high-speed circuit: instead of adding preload like most compression adjusters, it changes leverage, which separates high-speed from low-speed damping. FOX's claim is that you can add high-speed clicks without losing small-bump sensitivity. The 2024-on Tacoma kits use it, such as the Elite pairs 883-06-224 (front) and 883-26-143 (rear) and the Factory Race internal bypass pairs 883-06-232 and 883-26-149.
Which FOX parts have DSC
| Adjuster | Where FOX uses it (truck parts we list) | Examples |
|---|---|---|
| DSC | Most Performance Elite pairs (73) and many Factory Race kits (44) | Tacoma 2005-2023: 883-06-177, 883-26-112; Ram 2500 2014-2026: 883-26-062, 883-26-065 |
| DSC EVO | Newer Performance Elite (18) and Factory Race (6) kits | Tacoma 2024-2026 (above); Land Cruiser 300 / LX600 front 883-06-231 |
| 8-click compression adjuster | Adjustable 2.0 Performance reservoir shocks (19), labeled "CD Adjuster" by FOX | Super Duty front, 4 to 5 in: 985-26-133 |
| 24-click ATS adjuster | Factory Race ATS steering stabilizers | Super Duty 2017-2026, 0 in lift: 983-02-143 |
Performance Series shocks without "adjustable" in the name have no external adjuster. FOX tunes them for the vehicle, and there is nothing to set. Compare the series in FOX Performance vs Performance Elite vs Factory Race. For heavy-duty trucks, see FOX shocks for Super Duty, Ram HD and Silverado HD. Then shop the FOX collection. Found it cheaper? We'll beat it.
FAQ
What is the FOX DSC factory setting?
Three clicks from fully open for low-speed compression and three for high-speed, on all four shocks. FOX lists exceptions for a few vehicles in the owner's manuals.
Does DSC adjust rebound?
No, DSC adjusts compression only. Where a FOX kit also has rebound adjustment, its features say so. Several Factory Race kits, for example, list "Quick Switch Compression And Rebound Adjusters".
Can the front and rear have different DSC settings?
Yes. FOX says front and rear can differ, but both front shocks must match each other, and so must both rears.
Do FOX Performance Series shocks have DSC?
No. DSC is a Performance Elite and Factory Race feature. A small group of 2.0 Performance reservoir shocks has a simpler 8-click compression adjuster, and the rest have no external adjustment.
What if I lose track of my settings?
FOX's factory setting is a good all-round baseline for road and trail, so return both knobs to three clicks from fully open and start again.