If you’re searching for suspension part MT552 2005AR, you likely need a specific component for your vehicle’s front or rear suspension. This article explains what this part is, which cars it fits, how to tell when it’s worn out, and how to pick a reliable replacement. The goal is to help you make an informed purchase and avoid common mistakes.
Understanding Suspension Part MT552 2005AR
Suspension part MT552 2005AR refers to a control arm bushing or a complete control arm assembly, depending on the manufacturer’s cataloging. It is a critical link between the vehicle’s chassis and the wheel assembly, allowing controlled movement while absorbing road impacts. The “2005AR” designation typically indicates a model year (2005) and possibly a specific application suffix (AR may stand for “Aftermarket Replacement” or a vehicle code).
Specifications and Materials
Most MT552 2005AR units are made of forged steel or cast iron for the arm, with a rubber or polyurethane bushing pressed into the mounting eye. The rubber bushing dampens vibration and noise, while polyurethane offers firmer handling. The part includes a ball joint or a separate bushing at the opposite end. Common OEM-style replacements use rubber bushings; performance upgrades use polyurethane.
- Bushing Inner Diameter: Typically 14-16 mm for the mounting bolt.
- Arm Length: Approximately 300-350 mm, but measure your old part to confirm.
- Bolt Hole Center Distance: Critical for alignment; typically 80-100 mm.
- Material: Steel arm, rubber or polyurethane bushing.
Always check the manufacturer’s specifications for exact dimensions before purchasing.
Compatible Vehicle Models
The MT552 2005AR is most commonly used on 2005 model year vehicles from a specific manufacturer. Based on the part number pattern, it is frequently found on:
- 2005 Alfa Romeo 159 – front lower control arm, left or right side.
- 2005 Alfa Romeo Brera – similar chassis, same part.
- 2005 Alfa Romeo Spider – front suspension.
Other possible applications include certain 2005 models from Fiat or Lancia that share the platform. To be certain, verify the part number against your vehicle’s VIN or the old part’s casting number. If the part is for the rear, it may be a trailing arm or lateral link.
How to Identify Your Application
- Jack up the vehicle safely and remove the wheel.
- Locate the suspension arm in question. It connects the wheel hub to the frame or subframe.
- Look for a stamp or sticker on the arm with a part number. If it matches MT552 or a superseded version, you have the correct part.
- Measure the arm length and bushing sizes to cross-reference.
Signs Your MT552 Needs Replacement
Worn suspension parts compromise safety and ride quality. Replace the MT552 if you notice any of these symptoms:
- Clunking or knocking noise when driving over bumps or turning.
- Vague steering or a pulling sensation during braking.
- Uneven tire wear (inside or outside edge).
- Excessive vibration at highway speeds.
- Visual damage – cracked rubber bushing, torn boot, or bent arm.
Inspection Checklist
- Park on level ground and shake each wheel top-to-bottom. Excessive play indicates a bad ball joint or bushing.
- Use a pry bar to check for movement between the arm and the frame. Any noticeable play means the bushing is compromised.
- Check the rubber bushing for dry rot, cracks, or separation from the metal sleeve.
If the bushing is worn but the arm is intact, some shops can press in a new bushing. However, complete arm replacement is often quicker and more reliable.
How to Choose a Quality Replacement
When buying a suspension part MT552 2005AR, quality varies widely. Here’s what to look for:
OEM vs. Aftermarket
- OEM (Original Equipment Manufacturer): Exact match to the part from the car factory. Usually highest quality but most expensive. Look for brands like TRW, Lemförder, or the carmaker’s own brand.
- Premium Aftermarket: Brands like Moog, Meyle, or Febi Bilstein offer parts that meet or exceed OEM specs. Often include upgraded bushings or coatings for longer life.
- Budget Aftermarket: Cheap no-name parts may wear quickly, fail prematurely, or fit poorly. Avoid unless you need a temporary fix.
Material and Construction
- For street driving, rubber bushings provide comfort and longevity. Polyurethane is firmer and less prone to wear but transmits more noise and vibration.
- Check the bushing’s hardness rating: OEM is usually 60-70 Shore A. Polyurethane often 80-90 Shore A.
- Look for corrosion-resistant coatings like e-coating or zinc plating on the arm.
Warranty and Return Policy
- Reputable brands offer a limited lifetime or 2-3 year warranty.
- Ensure the seller accepts returns if the part does not fit. Some online retailers require you to confirm fitment before purchase.
Installation Tips
Replacing a control arm is an intermediate DIY job. If you are not experienced, consider a professional mechanic. Key steps:
- Safety First: Securely lift the vehicle on jack stands. Never work under a car supported only by a jack.
- Remove Wheel and Brake Caliber: Unbolt the caliper and hang it out of the way with a wire. Do not let it dangle by the hose.
- Disconnect Sway Bar Link: If attached, remove the end link from the control arm.
- Remove Ball Joint Nut and Separate: Use a ball joint separator tool. On some designs, the ball joint is bolted to the knuckle.
- Remove Bracket or Subframe Bolts: The inner bushing bolts often require a torx or hex socket. Note the position of any alignment cams.
- Install New Arm: Insert the inner bushings with bolts loosely tightened. Attach the ball joint. Torque all fasteners to factory specs with the vehicle’s weight on the suspension (at ride height).
- Align the Vehicle: A professional alignment is mandatory after replacing a control arm. Misalignment accelerates tire wear and impairs handling.
Common Mistakes
- Over-tightening bushings before the car is lowered. This pre-loads the bushing and can cause premature failure.
- Reusing old bolts or nuts. Always use new hardware if specified by the manufacturer.
- Ignoring the need for an alignment. Even if the car seems to drive straight, the angles may be off.
Final Recommendation
For most drivers, a premium aftermarket suspension part MT552 2005AR from a known brand like Moog or Lemförder offers the best balance of quality, price, and durability. Verify fitment by checking your vehicle’s make, model, and year—or better yet, read the part number on the old arm. If you are unsure about installation, have a qualified mechanic do the work and get an alignment afterward. Investing in a good part and proper installation pays off in safety, handling, and tire life.