The Bilstein 5100 Series rear shock absorber (part number 24-249966) is a monotube gas-charged design, sized for the 1996-2002 Toyota 4Runner rear suspension. In a monotube layout, the damping oil and high-pressure gas share one tube, so the damper dissipates heat more evenly and is less prone to fade than a stock twin-tube unit. Owners who run larger tires, carry cargo, or tow are the ones who notice the difference most. Compare the price against a basic replacement: a monotube rear damper is a durability and control upgrade, not just a new part.
Fitment is the first thing to verify. Confirm the exact year range, drivetrain, and whether your rear suspension is stock or lifted against the manufacturer's application guide before ordering, since ride height changes which shock length is correct. Installation is a bolt-on rear job. Searches for 1996-2002 4Runner rear shock, Bilstein 5100 monotube, 4Runner rear gas shock upgrade, and 24-249966 are the most common routes buyers take to find this part.
