IronBox BMW E36 / E46 / E83 / Z4 Adjustable Rear Upper Control Arms — Street Version
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145.00
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The IronBox adjustable rear upper control arms replace the factory spring-carrier arms on BMW E36, E46, E83, and Z4 rear suspension systems converted to true rear coilovers ⠀ The reinforced steel construction is designed for drift, track, and performance builds while the adjustable layout allows the rear suspension geometry to be corrected after lowering or changing the suspension configuration ⠀ These arms are designed exclusively for integrated rear coilovers where the spring and damper are combined into a single unit ⠀ Main features ⠀
True rear coilover configuration — replaces the factory upper spring-carrier arms when converting to integrated rear coilovers
Adjustable rear geometry — allows rear camber and suspension geometry to be corrected after lowering or suspension modifications
Reinforced construction — designed for active drift, track, and performance use
Serviceable silentblock design — uses a standard silentblock format for simpler maintenance and replacement
Steel construction — provides the strength required for demanding motorsport applications
Powder-coated finish — protects the main arm assemblies against corrosion
Designed and manufactured in Ukraine by IronBox
⠀ Compatibility ⠀
BMW 3 Series E36 — excluding E36 Compact
BMW 3 Series E46
BMW X3 E83
BMW Z4 — exact chassis and rear suspension configuration must be confirmed before ordering
True or integrated rear coilovers only ⠀
Not compatible with BMW E36 Compact
Not compatible with OEM-style separate rear springs
Not compatible with the standard rear anti-roll bar or sway bar
BMW M models and vehicles with modified rear subframes or suspension components must be confirmed before ordering
⠀ Compatibility is determined by the chassis, rear suspension configuration, coilover type, and installed suspension components ⠀ Required parts — not included ⠀
True or integrated rear coilover suspension
Any non-standard rear anti-roll-bar solution required by the vehicle configuration
⠀ Kit includes ⠀
Rear upper control arms — 2 pcs
⠀ Important installation information ⠀ This product is intended only for vehicles converted to true rear coilovers ⠀ A true rear coilover conversion transfers the spring load to the rear shock towers ⠀ The rear shock towers must be inspected before installation and reinforced where required ⠀ Weld-in IronBox rear shock tower reinforcement plates are available separately for BMW E36 and E46 applications ⠀ The standard rear anti-roll bar cannot be retained with these arms ⠀ Coilover clearance, driveshaft clearance, suspension travel, thread engagement, and all mounting points must be checked throughout the complete suspension movement ⠀ A complete four-wheel alignment is required after installation ⠀ All adjustment points and locknuts must be correctly tightened after the final suspension setup ⠀ Installation and final inspection must be carried out by a qualified specialist ⠀ Matching IronBox adjustable rear lower control arms are available separately for additional rear suspension adjustment