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BMW Control Arm Replacements & Upgrades

Control arms, and their integrated ball joints, are some of the most crucial components on a BMW suspension. The control arms literally control the wheel and suspension as they go through their range of motions. They do more than just keep the alignment in a constant spec - they are a vital locating component for the suspension itself. A faulty or worn control arm or ball joint is a very dangerous and potentially life-threatening problem so make sure they are inspected and replaced at regular intervals.

Most control arms for BMWs consist of an inner and outer ball joint made of plastic, rubber, Delrin, or metal and covered in grease with a rubber boot to seal it from the outside. The ball joint rotates and spins as the control arm goes through its movements and that will wear the ball joint and make it loose. The grease inside the housing can also get used up, evaporate, or become contaminated from moisture and foreign particles. As the ball joint becomes worn it can result in excess movement within the housing. Your steering and handling will become less precise and there is usually a light clunking or clicking sound. In rare and extreme cases the ball joint can separate from the control arm completely, leading to a total loss of suspension and steering control. You should have the ball joint play checked annually and replace them every 3-4 years. Most track organizations will not allow a car if they are older than three years.

Control arms also take abuse from impacts and handling forces. Aluminum control arms will generally bend and prevent an accurate alignment. Steel control arms will crack and fracture and require close inspection annually and replacement every 3-4 years.

We sell OE BMW, OEM, and performance upgrade control arms from proven manufacturers. The control arm is so important to a BMW suspension that we insist on only top quality brands and designs and will never sell a control arm based on price alone. We also have upgrade packages with superior designs and better bushing options and we have bundled these together with valuable package savings.

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Turner Motorsport Sealed Monoball Rear Trailing Arm Bushings (pair) (RTAB) - V2.0 E36 E46 Z4
Turner Motorsport - Corporate Logo
T#:555366
Part#: 017738TMS02
In Stock
Sale - Save 15% $270.95
$230.31
Free Shipping
Sale - Save 15% $270.95
$230.31
Free Shipping

Our sealed Monoball Rear Trailing Arm Bushings (RTAB) are the best solution for completely eliminating deflection and unwanted toe changes on the rear of the E36, E46, and Z4. While rubber and urethane bushings flex during load, the toe can change widely giving you nervous and unpredictable handling. These RTABs have a solid aluminum housing with a high-quality sealed OE bearing. These bushings were developed from years of competition use in various racing and HPDE events. There is simply no better RTAB unless your racing class rules prohibit the use of mono or spherical bearings.

The rear trailing arm bushings take a lot of abuse from acclerating, braking and cornering. The stock rubber bushings are just not up to the task of keeping rear wheel alignment in spec for very long, especially if you have upgraded to stickier tires and a better suspension. The pliable rubber flexes and twists which slows down reaction time and leaves you with a car that feels nervous and 'tail happy'. Urethane helps to control the alignment but issues with fitment, maintenance, and longevity keep us from recommending urethane on anything but a street car. We also offer a Delrin RTAB for cars that must conform to certain racing class rules. These sealed spherical bearings are the best at controlling rear toe alignment.

Our aluminum RTABs are very well made - high grade aluminum alloy and steel CNC'd out of a billet by an ISO 9001 certified manufacturer, each component is either hardcoated or nickel plated. While multiple manufacturers offer two piece designs, our research showed that a one piece bushing is a better design featuring a sealed bearing to keep contaminants out extending the life of the bearing.

Features:

Key Benefits:

  • Rear Trailing Arm Monoball eliminates unwanted deflection, maintaining alignment settings and minimizing wheel hop.
  • Allows full rear trailing arm articulation for low friction movement and eliminates binding found in rubber and poly bushings.
  • Completely streetable: utilizes an OES Lemforder brand sealed, greased ball joint for an extremely long service life with no increase to NVH.

 

Design Features:

  • Housing: Billet CNC 6061-T6 aluminum, type II anodized for exceptional durability and corrosion resistance
  • Bearing: OE Mercedes/lemforder 2043520027 Sealed ball joint
  • Bearing inserts: CNC machined 303 stainless steel.
  • Rebuildable

Clickhere for installation instructions.

This item fits the following BMWs:
1992-1998 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
2003-2008 Z4 BMW Z4 2.5i Z4 3.0i Z4 3.0si Z4 M Roadster M Coupe

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M3 Front Upper+Lower Control Arm Upgrade - Left and Right - E82, E9X
Packaged by Turner - Corporate Logo
T#:339948
Part#: TMS12059
Inventory On Order, ETA Aug 25, 2021
Starting at $354.50
Free Shipping
Starting at $354.50
Free Shipping

The front upper and lower control arms from the E9X M3 are a direct bolt-in replacement upgrade for the stock parts on the non-M E90/E91/E92/E93 3-series and E82/E88 1-series. With the M3 components the fluid-filled bushings of the standard suspension are replaced with solid rubber cores or a sealed monoball-joint, making the suspension stiffer, more responsive, and longer lasting.

This package includes:

  • M3 front upper control arms (thrust arm, tension strut) (31102283575 and 31102283576)
    The upper control arms eliminate the fluid-filled stock bushing which is very prone to leaking the fluid and cease being effective. The solid rubber M3 bushing is also a bit stiffer for more precise steering and control.
  • M3 front upper inner bushings (31102283579)
  • M3 front lower control arms (wishbone) (31102283577 and 31102283578)
    The M3 lower control arm has a sealed inner bearing instead of the rubber-isolated stock bushing. The bearing allows the lower arm to rotate freely instead of binding up. It's also a bit longer and curved slightly to give more negative camber (adds .75 of negative camber).

Optional: M3 headlight adjusting rod (37142283867). This rod corrects the headlights for your ride height. The original non-M leveling rod will not work on the new M3 control arm. This rod is required on all cars with Xenon headlights but not needed for standard halogen lights.

With the added negative camber the steering is sharper and understeer is reduced. And the stiffer bushings and bearings deflect less which also improves steering feel and response. Since all of these parts are from the M3 there is no question on quality or longevity; no doubt as to their effectiveness or reputation. There's almost no downside to this upgrade. These are intended for street cars but even lightly tracked cars will see significant benefits to the handling and response.

We offer this package with the OEM TRW brand components or with Original BMW branded parts (stamped with TRW logo).

This M3 upgrade package fits the following BMWs:
2008-2012 E82 BMW 128i 135i 1M Coupe
2006-2011 E90 BMW 325i 328i 330i 335i M3 - Sedan
2006-2011 E91 BMW 328i - Wagon
2007-2012 E92 BMW 328i 335i 335is M3 - Coupe
2007-2012 E93 BMW 328i 335i M3- Convertible

2009+ Z4 BMW Z4 sDrive28i Z4 sDrive30i Z4 sDrive35i Z4 sDrive35is 

 

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Turner Centered Polyurethane Front Control Arm Bushing - 80A - Pre-Installed In Brackets - E36, Z3, E30
Turner Motorsport - Corporate Logo
T#:397529
Part#: 012633TMS01-03KT
Inventory On Order, ETA Aug 13, 2021
$148.95
Free Shipping

Here at Turner we understand the importance of an upgrade that will get the results you need on the track and still be tolerable on the drive around town. When it comes to control arms on the track, making them as stiff as you can (usually using solid mounts) is the best way to increase your driving precision by eliminating the deflection of rubber. The next best thing to create a balance would be to stiffen up the control arm with polyurethane, giving you the option of a more stock like feel with 80a or closer to the solid feel with 95a durometers.

When it comes to the E36 chassis you also get the options of choosing a stock centered design or going with the E30 inspired offset bushing to increase castor, further taking advantage of improvd handling. These poly bushings will give your control arms a direct connection between your suspension and the body of the car eliminating the slop felt under take-off and braking so you feel more in control of your vehicle. 

This item fits the following BMWs that use a centered-style bushing: 

1984-1991 E30 BMW 318i, 318is, 325, 325e, 325es, 325i, 325is 
1992-1999 E36 BMW 318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic
1996-1999 E36 BMW M3 S52
1997-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i MZ3 M Coupe M Roadster 

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