4Runner Bilstein B8 8100 Bypass Reservoir Rear Shock Features:
- Supports 0-2 inch rear lift
- Direct fit rear shock, passenger side
- External bypass reservoir design
- Adjustable compression and rebound tuning
- Position sensitive damping control
- Excellent bottom out resistance
- Remote reservoir for cooler performance
- Motorsports inspired shock technology
- Built for aggressive off road use
- Includes reservoir mounts and hardware
- Bilstein 2 year warranty included
Race Bred Control for a Trail Proven Platform
If you have spent any time pushing a 4Runner through whoops, rocky climbs, or long stretches of washboard trail, you already know the rear shocks make or break the experience. The Bilstein B8 8100 Bypass Reservoir Rear Shock for the passenger side is built for drivers who want more than just a lift or a stiffer ride. This is a motorsports inspired damper designed to bring real control and confidence to the back of your rig, whether you are crawling through technical terrain or carrying speed across open desert. What separates the 8100 from typical performance shocks is its external bypass design with independent compression and rebound adjustment. Instead of a one size fits all feel, you can fine tune how the rear end reacts to bumps, body roll, and hard hits. Around town it can feel composed and controlled, soaking up rough pavement without beating you up. Out on the trail, the position sensitive damping keeps the ride compliant over small chatter while delivering serious bottom out resistance when the suspension cycles deep. The remote reservoir increases oil capacity and helps manage heat, which means consistent performance when the trail gets long and temperatures climb.
Built for Real Use and Tuned for Your Style
This shock uses a large 60mm piston inside a hard anodized aluminum body, giving you a wide range of damping control and long term durability. It is designed as a direct fit for 2003-2024 4Runner models, so installation is straightforward and uses the factory mounting points. The included reservoir mounts and hardware make it easy to secure everything cleanly, and there is even an optional billet reservoir clamp available if you want a tighter, more refined look in the wheel well. Behind the wheel, the difference is noticeable. The rear of the truck feels more planted in corners, more controlled under load, and far more composed when you hit unexpected obstacles at speed. If you are building a 4Runner that sees overland trips, aggressive trail runs, or simply demands higher performance than stock can offer, the B8 8100 gives you the ability to tune your suspension around how you actually drive. It is not just about adding capability on paper.
Vehicle Fitment: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 Toyota 4Runner
Application Note: Will not work with KDSS models
Application Note: Price shown is for quantity (1) shock. Requires a LEFT and RIGHT shock (separate part numbers.) Purchase Bilstein's
Driver Side Bypass Shock
Rear Shock Notice: Advertised rear lift height indicates the maximum lift these shocks are valved and sized to support. Lift Height must be achieved through proper rear suspension components (blocks, springs, etc.).
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Install Guide
