MITSUBISHI MMN184100 ARM ASSY
Product Specifications
| MITSUBISHI | MMN184100 |
The ARM ASSY is a structural suspension linkage rod that connects the wheel carrier or hub assembly to the vehicle body or subframe at a defined geometric angle, constraining the wheel's position in one or more directions while allowing controlled movement in the suspension travel direction. Suspension arms — also called lateral links, trailing arms, toe links, camber links, or traction strut rods depending on their orientation and function in the specific suspension design — are used in multi-link rear suspension systems, MacPherson front suspension lower arm configurations, and double-wishbone designs to define the wheel's precise kinematic path through bump and rebound travel, maintaining the correct camber, toe, and caster relationships between the wheel and the body at all suspension positions. The arm body is typically a pressed steel channel section, a forged steel rod, or a stamped aluminium extrusion, with a rubber-bonded compliance bushing at each end that isolates road vibration and noise from the body while providing controlled compliance in specific directions calibrated to the suspension's intended handling character. The compliance bushing's stiffness characteristics are as important to the suspension's behaviour as the arm's geometric length — a bushing that is too stiff transmits harshness; one that is too soft produces excessive suspension compliance and vague handling.
This unit — MITSUBISHI MMN184100 — is manufactured to OEM-equivalent specifications: arm body cross-section and material grade, overall length between bushing centres, bushing bore diameter and compliance direction stiffness, mounting bolt hole size and position at each end, and ball joint taper dimensions where the arm carries an integrated ball joint are matched to the original part. Supplied as a complete assembly with bushings pre-installed. Available wholesale from 5.84 USD, MOQ 50 pcs, production lead time 20-35 days.
Suspension arms fail through rubber bushing deterioration — cracking, delamination from the metal sleeve, and loss of compliance from ozone and age — that produces knocking noises and altered suspension geometry; through physical bending or cracking of the arm body from kerb strikes, severe pothole impacts, or collision damage; and through corrosion perforation of the pressed steel body in road salt environments. A bent arm cannot be straightened reliably — the metal's yield point has been exceeded and the internal stress state is unknown; a bent arm must always be replaced rather than returned to service regardless of how minor the visible deformation appears.
- Mark the existing bolt positions and any eccentric cam bolt settings before removing the arm — photograph all eccentric cam bolt head orientations and any shim positions at the arm mounting points; these settings determine the wheel's current toe and camber angles; returning the new arm's fasteners to the marked positions preserves the current alignment closely enough for safe driving to the alignment shop without causing immediate tyre damage from gross geometry error.
- Support the wheel hub and hub carrier with a workshop jack before removing any arm bolts — multi-link rear suspension arms carry the hub in a statically determinate arrangement where removing any single arm allows the hub to move freely in one direction; supporting the hub prevents sudden movement that over-extends the brake hose or ABS sensor wire when an arm is released.
- Do not tighten any arm mounting bolt until the vehicle is lowered to ride height with the full vehicle weight on the suspension — tightening compliance bushings with the suspension hanging at full droop pre-stresses the rubber element in a twisted position; when the vehicle is lowered to ride height the bushing is further twisted beyond its design range, reducing compliance and causing the rubber to crack from the pre-stress within a short mileage; always perform final torque with the suspension loaded at ride height by jacking under the hub carrier to simulate laden height.
- Verify the arm is the correct specification for the installation position before installation — multi-link suspensions use arms of similar overall appearance but different lengths, bushing compliance directions, and ball joint taper angles at each position; fitting an arm from the wrong position alters the wheel's kinematic path through suspension travel and produces unpredictable dynamic alignment change that a static alignment cannot correct.
- Inspect all adjacent arm bushings and ball joints while the arm is accessible — with the hub supported independently, the remaining arms at the same axle position are exposed for inspection; press on each arm and check for compliance bushing play and cracking; an arm being replaced for bushing failure on one end frequently has equally worn bushings at the other end or on adjacent arms of the same age.
- Install the new ARM ASSY (MITSUBISHI MMN184100), hand-start all fasteners before torquing any, lower the vehicle to ride height and torque all arm bolts to OEM specification with the suspension at laden height, have a four-wheel alignment performed immediately — suspension arm replacement affects toe, camber, and on some designs caster — and confirm all angles are within OEM specification before returning the vehicle to service.
| Part | Reason for Combined Replacement |
|---|---|
| Adjacent Suspension Arms at the Same Corner Lateral, trailing, toe, or camber link — OEM ref. varies | Multi-link suspension arms at the same corner share identical age, road exposure, and load history — if one arm's bushings have failed, the adjacent arms are at the same bushing wear stage. Replacing all arms at one corner simultaneously during a single hub support and alignment operation eliminates repeat alignment fees within a short period and restores the complete multi-link geometry to new condition in a single service visit. |
| Wheel Bearing Hub Assembly OEM ref. varies by axle position | Suspension arm replacement requires partial disassembly of the hub carrier mounting arrangement — this provides clear access to inspect the wheel bearing for play and noise. A wheel bearing approaching end of life should be replaced simultaneously with the arm to avoid a repeat hub carrier disassembly within a short interval, particularly on rear axles where bearing access requires significant suspension disassembly effort. |
| Subframe Mounting Bolt Set Application-specific high-strength bolts | Suspension arm mounting bolts at the subframe and body attachment points are frequently single-use stretch bolts or bolts with specific torque-to-yield tightening requirements that cannot be reliably retorqued after removal. Always replace all mounting bolts removed during arm replacement with new bolts of the correct grade and specification — reusing a stretch bolt that has already yielded provides less than its rated clamping force regardless of the torque wrench reading. |