TRQ Front Upper Forward Tension Control Arm LH Driver Side - Direct

In this review of the TRQ Front Upper Forward Tension Control Arm LH Driver Side, the bottom line is simple: this part is for owners of compatible Mercedes-Benz 4Matic models who need a direct-fit replacement without fabrication. The reviewer finds it provides a precise OE-style fit and saves on dealer pricing while offering pre-assembled convenience. For DIY mechanics comfortable with front suspension work, it is a practical, cost-effective option; for those who need a lifetime warranty or factory-branded part, other channels may be preferable.

Key Features

• Direct replacement: Fits specific Mercedes Benz E and CLS 4Matic models as a plug-and-play upper forward control arm, reducing install fuss and alignment surprises.
• Pre-assembled with ball joint: Arrives assembled to save time during installation and eliminate the need to source separate components.
• Compatibility references: Includes multiple reference numbers such as RK622444 and 2123303111 so technicians can confirm fitment against parts catalogs.
• DIY resources: From a brand known for DIY videos, the part is supported by installation guidance to help a competent homeowner or technician complete the job correctly.
• Durability focus: Built as a replacement part intended to match the original geometry and restore proper front suspension control and handling.

Who It's For

This control arm is aimed at owners of 2010-2018 Mercedes E-Class and CLS models equipped with 4Matic AWD who want a direct-fit replacement for the front upper forward driver side arm. It suits independent shops and experienced DIYers who value pre-assembled parts and clear compatibility references to confirm fitment.

It is less appropriate for buyers seeking factory-branded Mercedes parts with dealer warranty coverage, or for customers who prefer a comprehensive manufacturer-backed lifetime warranty. Buyers should also verify exact model year and submodel fit using the provided compatibility notes before purchase.

Pros & Cons

Pros

• Direct-fit design means minimal modifications and a faster install for experienced technicians.
• Pre-assembled unit with ball joint saves time and reduces parts sourcing complexity.
• Good value compared with dealer priced control arms while matching original geometry in most customer reports.

Cons

• Some buyers have reported ball joint issues, so long-term durability may vary depending on driving conditions and installation quality.

Specifications

Part type	Front upper forward control arm (driver side LH)
Included component	Control arm with ball joint (pre-assembled)
Compatible vehicles	Mercedes E350, E550, E400, E250 Bluetec and CLS550/CLS400 4Matic (model years listed)
Reference numbers	RK622444; 2123303111; 102-7957; 512-59687L; 524-541; CMS101388
Position	Front driver side upper forward
Brand	TRQ

Our Verdict

The TRQ front upper forward tension control arm is a sensible, cost-conscious replacement for compatible Mercedes 4Matic owners who want a direct-fit, pre-assembled unit supported by DIY guidance. It restores suspension alignment and handling for most drivers at a fraction of dealer cost, though a small number of users have reported ball joint concerns, so verify fitment and inspect the joint on installation.

Frequently Asked Questions

Will this control arm fit my vehicle?
Check the listed compatible model years and use the reference numbers to confirm exact fitment for your E or CLS 4Matic before purchase.

Is the ball joint included?
Yes, the control arm is supplied pre-assembled with the ball joint to simplify installation.

Can a DIYer install this part?
An experienced DIYer with suspension tools can install it, and TRQ provides video resources to guide the process; otherwise have a shop handle installation and alignment.