Bilstein's 8100 series are a direct fit, 2 tube external bypass. This lets you adjust your compression and rebound zone independently while providing a plush "ride zone". The engineering concept behind these is to give you the best ride comfort and handling on road, while also taming large suspension inputs off-road. During normal daily driving you have the control of the full size 60mm main piston, you can take your rig to work, pick up a load of groceries, or hit twisty mountain roads with maximum comfort and control. Off-road, the large external bypass tubes let some oil "bypass" the main piston valving to get your suspension moving over the rough stuff. The final compression zone is tuned as a bump zone and the bottom rebound zone serves to slow down harsh top out events. If you tuned normal smooth body shocks to work as good off-road, they would be miserable on-road, and vice versa. The reservoir mounts on these are at the base of the shock, which delivers increased compression control during the full cycle and keeps the seal assembly cooler. You can adjust these on the fly with a wrench and hex key, or we offer "tool-less" adjusters which can be installed for 225.00.
Everything about this bypass is built for the rear end of your 4runner. The reservoir position is 100% custom fit as well as the valving and even the bypass zone placement itself is specific to this application.
This is for a pair of external bypass shocks for the rear of your 4Runner.
These shocks are designed to work with rear lift heights from 0-1.5".