Description
4.0″ Internal Bypass Shock Absorber
The Solid Shocks Co. 4.0″ Internal Bypass shock is built for the most demanding off-road applications — high-speed desert running, heavy trophy trucks, and class-1 buggies that punish suspension on every lap. The larger 4.0″ body delivers more oil, more cooling, and more control where it matters most.
Built for Big-Hit Performance
- 4.0″ diameter body handles heavier vehicles and bigger landings without fade.
- Increased oil capacity and higher nitrogen pressure maintain consistent damping under sustained abuse.
- Built-in progressive bump zone increases resistance near full compression — eliminating harsh bottom-outs in the worst conditions.
- Race-proven durability with consistent performance lap after lap.
Internal Bypass Technology
- Precision-tuned bypass bleed ports allow a larger fluid volume to circulate with less resistance — smoother across washboard and chatter.
- Longer machined metering rod creates a controlled transition through the damping zones for a progressive, predictable feel.
- Variable bleed and shim options — every piston custom tuned for your vehicle weight, suspension geometry, and driving style.
- Lower operating temperatures help prevent shock fade during extended desert runs.
Simplified Build, Race-Proven Reliability
Internal bypass channels deliver the benefits of an external bypass system without the extra hardware, weight, or labor. The result: fewer parts to fail, easier installs, and lower total cost — without giving up performance.
Custom Built To Spec
Every 4.0″ Internal Bypass is built to order. Tell us your vehicle, your weight, and where you ride — we’ll dial in valving, bleed, and shim stack to match. Call (714) 265-1450 or reach out for a custom build quote.
Step up from a 3.0″ Internal Bypass, or compare against our 4.0″ Coilover and 4.0″ External Bypass. Service kit available — see the 4.0″ Bypass Rebuild Kit.
Shocks are sold individually. Custom tuning included on every build.
