Overland Suspension: Compare Shocks, Springs and Complete Lift Kits

Choose overland suspension around vehicle load and fitment. Compare BILSTEIN 5100 and Old Man Emu options, supporting parts and installation costs.

Reviewed 2026-11-05

Start with vehicle weight and intended travel

Suspension selection begins with the vehicle in the condition it will actually be driven. A lightly equipped daily driver and a truck carrying a permanent camper may need different solutions even when they share the same badge. Measure the load and record permanent accessories before selecting springs or lift height.

A taller stance is not a substitute for a properly matched suspension system. Ride control, travel, alignment and component compatibility matter more than a single advertised lift figure. The goal is a setup that works with the intended load and road conditions without creating new clearance or handling problems.

Product references and parts to compare

BILSTEIN describes the ride-height-adjustable B8 5100 as an application-dependent system using adjustable spring-seat positions. ARB offers multiple Old Man Emu families, including MT64, Nitrocharger Plus and BP-51. These are not interchangeable shock listings, and one family's model name is not enough to select a complete kit. ^[1][2][3]

Shocks and springs do different jobs

Springs support load and establish the system's relationship to vehicle weight. Dampers control motion. Replacing a damper alone is not the same as fitting a spring package intended for a new permanent load. Similarly, a spring selected for heavy constant cargo can be inappropriate when the vehicle is usually empty.

Ask the supplier to explain what load assumption the package uses. Does it assume a steel front bumper and winch? A rear carrier? A drawer system and water? Specify what is permanently attached and what is carried only during occasional trips.

Do not translate a suspension upgrade into a higher legal vehicle rating. The vehicle's payload and axle limits remain governing constraints unless a formally applicable approval changes them. For ordinary accessory selection, treat suspension improvements as component changes rather than permission to carry more.

Lift height is application-specific

A product family may advertise a range across many vehicles. The actual setting, achieved height and required supporting components depend on the exact application. Avoid taking the maximum number from a broad family page and applying it to every model.

Higher settings can create additional requirements involving alignment, clearance and travel. Check brake-line and ABS-wire routing, control-arm behavior, driveline considerations and tire clearance with the installer. Do not assume a part is needed on every vehicle, but do not omit a required component because another build did not use it.

The exact vehicle specification matters. Generation, drivetrain, engine, factory suspension package and trim-specific equipment can change compatibility. A “4Runner kit” or “Bronco kit” is an incomplete description.

Compare complete packages fairly

One retailer may advertise a shock pair while another lists a four-corner kit. A third may include springs and assembled fronts. Comparing their totals without reconciling contents will produce a misleading winner.

For an illustrative budget worksheet, write each component and service on its own line. Leave unknown labor and alignment blank until quoted. Record freight separately because heavy suspension parts can have meaningful delivery costs.

Match complexity to ownership

A daily-driven vehicle may benefit more from appropriate damping and maintained original components than from a complex adjustable setup. A vehicle used frequently on demanding terrain may justify additional capability, but the owner should understand service requirements and adjustment procedures.

Service access and support matter. Ask where rebuilds or replacement parts can be obtained, what maintenance the manufacturer specifies and whether local shops support the system. A sophisticated part that cannot be serviced conveniently may be a poor match for the owner.

After installation, evaluate the vehicle with its real travel load. Record changes in ride, clearance or alignment symptoms and address them with the installer rather than masking problems with another accessory.

Questions owners ask

Will stiffer springs solve every sagging problem?

No. First establish actual load, component condition and the correct application. More stiffness can create other compromises.

Are all 5100 shocks ride-height adjustable?

Do not assume so. Verify the exact application and product description; the named adjustable family is not a promise about every 5100 part.

Can I compare kits by lift height alone?

No. Contents, load assumptions, geometry, fitment and installed cost are equally important.