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Bilstein B8 5100 Series Rear Shock Absorber — Part #24-285780
Upgrade the rear suspension on your lifted Ram 3500 with the Bilstein B8 5100 Series shock absorber (24-285780). Built as a direct-fit replacement for trucks with a 2–3" rear lift and no air-leveling suspension, this 46mm monotube shock delivers fade-free damping, tighter control under load, and a more planted ride on the highway and off-road.
Why It Belongs on Your Ram 3500
Lifted 3500s with larger tires and extra payload put more demand on stock shocks. The B8 5100 answers that with Bilstein’s monotube gas-pressure design and a velocity-sensitive digressive piston. Heat dissipates faster than in twin-tube shocks, so performance stays consistent on long hauls, washboard roads, and heavy towing. Application-specific valving is tuned for this chassis—not a generic “one size fits all” shock.
Expect firmer body control, reduced rear axle wrap and power hop on high-torque trucks, and a noticeable improvement in ride quality compared with worn OEM units.
Key Features
- 46mm monotube design for consistent, fade-free damping
- Patented digressive piston that reacts instantly to changing road conditions
- Vehicle-specific valving for 2013–2025 Ram 3500 rear applications
- Zinc-plated body with protective coating for corrosion resistance
- 14mm centerless-ground, case-hardened, chromed piston rod
- Black bellows boot to protect the shaft from dirt and debris
- Smooth-body, non-coilover construction
- Direct bolt-on fit with OEM-style eye mounts
- Limited lifetime warranty
Fitment
- 2013–2025 Ram 3500
- Rear position
- 2–3" rear lift
- 4WD
- Does not fit trucks with rear air leveling / air suspension
- Sold individually — two required for a complete rear pair
- Verify collapsed and extended length against your lift and aftermarket springs before purchase
Specifications
- Part number: 24-285780
- Series: B8 5100
- Internal design: monotube, gas-charged
- Body: smooth-body non-coilover, approximately 2.0" diameter
- Piston diameter: 46mm
- Shaft diameter: 14mm
- Collapsed length: 19.57" (497 mm)
- Extended length: 29.88" (759 mm)
- Stroke: 10.31"
- Upper and lower mounts: 14.4mm eyes
- Boot: black bellows included
- Reservoir: none
- Adjustable damping: no
- Finish: zinc plated
- Weight: approximately 6.2 lbs
- Country of origin: MX
- UPC: 651860885773
Installation Notes
Bolt-on replacement using factory mounting points. Hardware style matches the stock rear shocks. Professional installation is recommended if you are also changing springs, blocks, or add-a-leafs. After install, torque mounts to factory spec and check for adequate droop and compression travel.
This shock is the go-to B8 5100 rear option for Ram 3500 owners who want proven Bilstein control without stepping up to a reservoir or adjustable damper. Pair it with matching front 5100s and quality rear springs for a balanced lift setup.
Bilstein B8 5100 Series Rear Shock Absorber — Part #24-285780
Upgrade the rear suspension on your lifted Ram 3500 with the Bilstein B8 5100 Series shock absorber (24-285780). Built as a direct-fit replacement for trucks with a 2–3" rear lift and no air-leveling suspension, this 46mm monotube shock delivers fade-free damping, tighter control under load, and a more planted ride on the highway and off-road.
Why It Belongs on Your Ram 3500
Lifted 3500s with larger tires and extra payload put more demand on stock shocks. The B8 5100 answers that with Bilstein’s monotube gas-pressure design and a velocity-sensitive digressive piston. Heat dissipates faster than in twin-tube shocks, so performance stays consistent on long hauls, washboard roads, and heavy towing. Application-specific valving is tuned for this chassis—not a generic “one size fits all” shock.
Expect firmer body control, reduced rear axle wrap and power hop on high-torque trucks, and a noticeable improvement in ride quality compared with worn OEM units.
Key Features
46mm monotube design for consistent, fade-free damping
Patented digressive piston that r[...]
Bilstein B8 5100 Series Rear Shock Absorber — Part #24-285780
Upgrade the rear suspension on your lifted Ram 3500 with the Bilstein B8 5100 Series shock absorber (24-285780). Built as a direct-fit replacement for trucks with a 2–3" rear lift and no air-leveling suspension, this 46mm monotube shock delivers fade-free damping, tighter control under load, and a more planted ride on the highway and off-road.
Why It Belongs on Your Ram 3500
Lifted 3500s with larger tires and extra payload put more demand on stock shocks. The B8 5100 answers that with Bilstein’s monotube gas-pressure design and a velocity-sensitive digressive piston. Heat dissipates faster than in twin-tube shocks, so performance stays consistent on long hauls, washboard roads, and heavy towing. Application-specific valving is tuned for this chassis—not a generic “one size fits all” shock.
Expect firmer body control, reduced rear axle wrap and power hop on high-torque trucks, and a noticeable improvement in ride quality compared with worn OEM units.
Key Features
- 46mm monotube design for consistent, fade-free damping
- Patented digressive piston that reacts instantly to changing road conditions
- Vehicle-specific valving for 2013–2025 Ram 3500 rear applications
- Zinc-plated body with protective coating for corrosion resistance
- 14mm centerless-ground, case-hardened, chromed piston rod
- Black bellows boot to protect the shaft from dirt and debris
- Smooth-body, non-coilover construction
- Direct bolt-on fit with OEM-style eye mounts
- Limited lifetime warranty
Fitment
- 2013–2025 Ram 3500
- Rear position
- 2–3" rear lift
- 4WD
- Does not fit trucks with rear air leveling / air suspension
- Sold individually — two required for a complete rear pair
- Verify collapsed and extended length against your lift and aftermarket springs before purchase
Specifications
- Part number: 24-285780
- Series: B8 5100
- Internal design: monotube, gas-charged
- Body: smooth-body non-coilover, approximately 2.0" diameter
- Piston diameter: 46mm
- Shaft diameter: 14mm
- Collapsed length: 19.57" (497 mm)
- Extended length: 29.88" (759 mm)
- Stroke: 10.31"
- Upper and lower mounts: 14.4mm eyes
- Boot: black bellows included
- Reservoir: none
- Adjustable damping: no
- Finish: zinc plated
- Weight: approximately 6.2 lbs
- Country of origin: MX
- UPC: 651860885773
Installation Notes
Bolt-on replacement using factory mounting points. Hardware style matches the stock rear shocks. Professional installation is recommended if you are also changing springs, blocks, or add-a-leafs. After install, torque mounts to factory spec and check for adequate droop and compression travel.
This shock is the go-to B8 5100 rear option for Ram 3500 owners who want proven Bilstein control without stepping up to a reservoir or adjustable damper. Pair it with matching front 5100s and quality rear springs for a balanced lift setup.