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Adjustable steel upper longitudinal control arms BMW Z4 G29 G20 G21 G22 G23 G26 G28 G42 - Uniball [33326878631] [33326878632]
- A set of adjustable steel rear upper trailing arms for BMW Z4 G29 and 2 Series Coupe G42, 3 Series G20 / G21 / G28, and 4 Series G22 / G23 / G26 (including i4).
In a set
PMC Motorsport Adjustable Steel Rear Upper Trailing Arms BMW Z4 G29 and 2 / 3 / 4 Series (G42, G20, G21, G28, G22, G23, G26) with Uniball Rod End – Replacement for 33 32 6 878 631 / 33 32 6 878 632
A set of adjustable steel rear upper trailing arms for BMW Z4 G29 and 2 Series Coupe G42, 3 Series G20 / G21 / G28, and 4 Series G22 / G23 / G26 (including i4). The control arms feature an M16x1.5 Uniball rod end with steel bushings and are a direct replacement for the factory control arms BMW OE 33 32 6 878 631 (left) and 33 32 6 878 632 (right). The length adjustment range is 224–250 mm (8.82"–9.84"), allowing precise correction of the rear axle geometry after lowering the vehicle or changing wheel setups.
Benefits for You
- Precise rear axle geometry correction – smooth length adjustment allows you to restore or fine-tune rear suspension settings for lowered ride height, wider wheels and tires, or specific applications: road, track, or drift.
- Rear axle stability under load – a rigid control arm prevents unwanted geometry changes during acceleration, braking, and cornering, keeping the rear predictable even under high horsepower.
- Even tire wear – correctly dialed-in alignment prevents premature and uneven tire tread wear.
- Direct handling response – the Uniball spherical bearing eliminates factory rubber bushing deflection, delivering sharper and more immediate feedback to throttle and steering inputs.
- Heavy-duty steel construction – designed to withstand high stresses and loads in drifting, track days, and time attack.
- Plug & play installation – direct replacement for OE arms 33 32 6 878 631 and 33 32 6 878 632, mounting into factory points without any body modifications.
- Manufactured in Poland with strict quality control – every component is CNC-machined and inspected prior to dispatch.
TECHNICAL INFORMATION
- type: adjustable rear upper trailing arm, left / right
- material: steel, color: white
- joint: Uniball M16x1.5 with steel bushings
- factory (OE) arm length: 238 mm / 9.37"
- length adjustment range: 224–250 mm / 8.82"–9.84" (−14 mm to +12 mm relative to OE arm)
- OE replacement: BMW 33 32 6 878 631 / 33326878631 (left), BMW 33 32 6 878 632 / 33326878632 (right)
- kit contents: 2 pcs of adjustable control arms
APPLICATION:
BMW Z4 Roadster (G29) from 2019
- sDrive20i – B46 / B48
- sDrive30i – B48
- M40i – B58
BMW 2 Series Coupe (G42) from 2022
- 230i / 230i xDrive – B48
- M240i / M240i xDrive – B58
BMW 3 Series Sedan (G20, also LCI) from 2019
- 318d / 320d / 320d xDrive / 330d xDrive – B47 / B57
- 318i / 320i / 320i xDrive / 330i / 330i xDrive – B46 / B48
- 320e / 330e (plug-in hybrid) – B46 / B48
- M340i / M340i xDrive – B58
- ALPINA D3 S – B57
BMW 3 Series Touring (G21, also LCI) from 2019
- 318d / 320d / 320d xDrive / 330d / 330d xDrive – B47 / B57
- 318i / 320i / 330i / 330i xDrive – B46 / B48
- 330e (plug-in hybrid) – B48
- M340i xDrive – B58
- ALPINA B3 Touring – S58
BMW 3 Series Long Sedan (G28, also LCI) from 2019
- 320Li / 330Li – B48
BMW 4 Series Coupe (G22) / Convertible (G23) from 2020
- 430i / 430i xDrive – B46 / B48
- M440i / M440i xDrive – B58
BMW 4 Series Gran Coupe (G26, also LCI) from 2021
- 420d xDrive – B47
- 430i / 430i xDrive – B46 / B48
- M440i / M440i xDrive – B58
- ALPINA B4 Gran Coupé – S58
- i4 eDrive35 / eDrive40 / xDrive40 / M50 (electric drive)
Frequently Asked Questions
Which cars do these control arms fit?
BMW Z4 G29, 2 Series Coupe G42, 3 Series G20 / G21 / G28, and 4 Series G22 / G23 / G26 (including i4), with petrol, diesel, and hybrid engines, RWD and xDrive, as well as ALPINA B3, B4, and D3 S versions. The arms replace the factory BMW OE 33 32 6 878 631 (left) and 33 32 6 878 632 (right) rear upper arms.
Do these arms fit BMW M2 G87, M3 G80 / G81, or M4 G82 / G83?
No. M models feature a different rear suspension geometry and different factory control arms. For those models, we offer dedicated PMC adjustable control arms.
What is the adjustment range?
The arm length is adjustable from 224 to 250 mm (8.82"–9.84"), which is from 14 mm shorter to 12 mm longer than the OEM arm (238 mm / 9.37").
Does the kit include both left and right control arms?
Yes. The kit contains 2 adjustable control arms that replace the left (33 32 6 878 631) and right (33 32 6 878 632) factory arms.
Does installation require any modifications?
No. The arms bolt directly into factory mounting points. A full wheel alignment on a professional alignment rack is required after installation.
Is Uniball suitable for a daily driver?
Yes, although Uniball spherical bearings transfer more NVH to the chassis than soft factory rubber bushings. In return, they offer precise and consistent handling, making them ideal for sports, track, and drift setups.
Does the price include customs duty for shipments outside the European Union?
No. Product prices and shipping quotes do not include customs duties or import taxes that may apply in the destination country.
Can I buy with 0% VAT?
Yes, if you are a B2B customer outside Poland with a valid EU VAT number (verified via VIES) or if your order is shipped outside the EU.
PMC Motorsport parts are intended for motorsport use. Installation should be performed by a professional workshop, and wheel alignment must be adjusted after fitting.