The Bilstein B6 4600 rear shock (part 24-139175) is a monotube, gas-pressure damper built as a replacement for the factory shock. The manufacturer describes the B6 4600 shock absorbers as a direct fit upgrade to OE shock absorbers on stock height light trucks and SUVs. Its monotube body is designed to resist the heat fade that softens worn factory units on rough roads or during trailer work. Its velocity-sensitive, digressive piston reacts to changing road conditions, so it firms up on rough pavement without making the ride harsh. Buyers searching for a 2002-2012 Jeep Liberty KJ rear shock upgrade, Bilstein B6 4600 rear monotube, or stock-height Liberty rear damper replacement get a stock-height, OE-matched option at a price below the complete set.
Owners on user forums say the rear swap is one of the easier suspension jobs on a KJ, and that a fresh set of shocks often makes the most of a fresh set of springs. Owners on enthusiast boards also warn that worn rear springs overwork new shocks, so inspecting the coils before the swap is a good idea. The shock is sold one per position, and the rear application lists a quantity of 2 per vehicle. Because this B6 is tuned for stock height, owners who have lifted their Liberty have typically gone to longer-body shocks instead.
The manufacturer positions the B6 4600 line as a direct fit upgrade for stock height vehicles. Fitment is listed for 2002-2012 Jeep Liberty models, but confirm the exact application against the manufacturer's catalog using your VIN before ordering.
Owners on user forums frequently recommend replacing the rear springs along with the shocks, since sagged springs can overwork new shocks and shorten their life. Whether to replace springs depends on your vehicle's ride height and condition.
This shock is designed for stock ride height. Owners on user forums with a lift of around 2.5 inches have reported choosing longer Bilstein shocks rather than this stock-height unit.
No. The manufacturer advises against impact wrenches on suspension components, because excessive torque can damage the suspension. Tighten the fasteners with a torque wrench to the vehicle service manual specification.
This is a manageable weekend-warrior job. Owners on user forums describe the rear shock swap as taking roughly 15 to 20 minutes per side once the vehicle is safely supported. Lift and support the rear of the vehicle, then remove the lower bolt and nut (a 15mm wrench and an 18mm socket are commonly cited), followed by the 15mm upper mount bolt. Seat the new shock at the top first, then fit the lower mount and tighten both fasteners with a torque wrench rather than an impact tool. If you are also replacing the rear coil springs, owners on user forums advise disconnecting the rear upper control arm first, because removing the springs with the axle in place can shift the differential and driveshaft.
