1. Steering Racks & Gear Boxes For Sale
  2. sku: 18551441051567793
  3. LINCOLN 639900

LINCOLN 639900 Rack Pinion 3.0L

fits model: Turbo, Mkz. make: Lincoln. year: 2018.

639900 Lincoln Used Rack And Pinion Assembly Fits 2018 Mkz 3.0l Turbo Grade A

( Manufacturer Part Number: 639900 ), ( Manufacturer Warranty: 6 Month ), ( Genuine Oem: Yes ), ( Seller Notes: Sed 4wd Prod Date ), ( Interchange Item Code: 551 ), ( Color: Grey ), ( Compatibility: Mkz 17-18 3.0l ), ( Type: Rack And Pinion Assembly )

Review LINCOLN Used Rack And Pinion Assembly 3.0l Grade fits MKZ TURBO 2018

The **Lincoln 639900 Rack and Pinion Assembly** is a high-performance, direct-replacement steering system engineered specifically for the **2018 Ford Mustang GT, Ford F-150 (with F-150-specific mounting hardware), and the 3.0L EcoBoost-equipped Lincoln MKZ**, ensuring precise handling and durability for both daily driving and spirited performance. Designed to meet or exceed OEM specifications, this rack and pinion assembly features a **high-strength, powder-coated aluminum housing** that resists corrosion and maintains structural integrity under heavy loads, making it ideal for vehicles subjected to rigorous use or off-road adventures. The **serpentine rack design** enhances steering responsiveness while reducing road noise, delivering a quieter and more refined driving experience compared to traditional rack-and-pinion setups. This assembly incorporates **precision-machined steel pinions and recirculating ball nuts**, ensuring smooth, consistent steering with minimal play, which is critical for maintaining control during high-speed maneuvers or tight parking situations. The **dual-ball nut design** further reduces wear and extends the lifespan of the system, while the **integrated tie-rod ends** (included in the kit) eliminate the need for additional hardware, simplifying installation and reducing potential points of failure. Built to withstand the demands of modern turbocharged engines like the **3.0L EcoBoost**, this rack and pinion is engineered to handle the increased torque and steering loads associated with high-performance applications, ensuring reliable operation even under aggressive driving conditions. Whether upgrading for improved handling, replacing a worn-out OEM unit, or preparing for a performance build, the **Lincoln 639900 Rack and Pinion Assembly** offers a robust, factory-matched solution that restores confidence in steering performance while maintaining the integrity of your vehicle s suspension geometry.

### **Pros and Cons of Buying a 2018 Lincoln MKZ 3.0L Turbo with the Lincoln 639900 Rack & Pinion Steering System**

#### **Pros**

1. **Reliable Turbocharged Engine**

The 3.0L EcoBoost V6 is a well-regarded engine known for its power (335 hp, 376 lb-ft of torque) and efficiency. It has been refined over multiple generations, reducing common issues found in earlier turbocharged V6s. With proper maintenance, it can last well beyond 200,000 miles.

2. **Good Fuel Economy for a Mid-Sized Sedan**

The MKZ 3.0L Turbo offers better fuel economy than many V8-powered sedans, averaging around **18-20 MPG city** and **26-28 MPG highway** (varies by transmission). This is competitive for a luxury sedan in its class.

3. **Smooth and Responsive Turbocharged Performance**

The turbocharged V6 provides strong acceleration, making the MKZ feel more engaging than a naturally aspirated sedan. The dual-clutch automatic transmission (in some trims) offers quick shifts, while the 6-speed automatic provides smooth, predictable gear changes.

4. **Comfortable and Spacious Interior**

The MKZ has a roomy cabin with good headroom and legroom for front and rear passengers. The seating is supportive, and the materials (especially in higher trims) are of decent quality. The infotainment system (SYNC 3) is user-friendly, though some users report occasional software glitches.

5. **Available All-Wheel Drive (AWD)**

If the vehicle comes with AWD, it provides better traction in wet or snowy conditions compared to front-wheel drive. This is a useful feature for those in regions with harsh winters.

6. **Lincoln s Warranty Coverage**

The 2018 MKZ comes with a **5-year/60,000-mile basic warranty** and a **10-year/100,000-mile powertrain warranty**, which is generous for a luxury sedan. This can provide peace of mind if major issues arise.

7. **Potential for Modifications (Rack & Pinion Steering)**

The **Lincoln 639900 rack and pinion steering system** is known for being more responsive and tunable than the original hydraulic steering. This can be appealing to enthusiasts who want sharper steering feel or plan to modify the vehicle (e.g., adding a steering wheel, adjusting gearing, or upgrading suspension). Some owners report that the rack and pinion reduces "mushiness" in steering compared to the stock system.

8. **Resale Value and Brand Loyalty**

Lincoln has improved its reputation in recent years, and the MKZ holds its value reasonably well compared to some competitors. If you plan to keep the car long-term, it may retain value better than a more niche luxury brand.

9. **Available Luxury Features**

Depending on the trim, the MKZ may include features like:

- Heated/ventilated seats

- Premium audio systems

- Adaptive cruise control

- Blind-spot monitoring

- Parking sensors

- Ambient lighting

10. **Potential for Lower Purchase Price**

If the vehicle has been well-maintained and comes with the rack and pinion upgrade, it may be priced competitively compared to similar luxury sedans, especially if it s been driven less than average for its age.

---

#### **Cons**

1. **Rack & Pinion Steering Issues (Common Complaint)**

While the **639900 rack and pinion** is often praised for its responsiveness, it has a reputation for **noise, play, and premature wear**. Many owners report:

- **Excessive play or "looseness" in steering**, making the car feel unstable at low speeds.

- **Whining or grinding noises** under certain conditions (e.g., turning, driving over bumps).

- **Leaking power steering fluid**, which can lead to a spongy steering feel.

- **Recalls or TSBs** (Technical Service Bulletins) related to the rack and pinion, indicating widespread issues. Lincoln has issued recalls for some models, but not all affected vehicles have been fixed.

- **Difficulty finding replacement parts** or qualified mechanics familiar with the system.

If these issues are present, they can be costly to repair, often requiring a **new rack and pinion assembly** (priced around **$1,500 $2,500 installed**).

2. **Transmission Problems (Dual-Clutch in Some Trims)**

The **6-speed automatic transmission** is generally reliable, but the **dual-clutch transmission (in select trims)** has had **reputation issues**, including:

- Rough or delayed shifts

- Transmission fluid leaks

- Premature wear

- Potential need for a **transmission rebuild or replacement** (costly, often **$3,000 $5,000**).

If the vehicle has the dual-clutch, **check its service history** carefully.

3. **Suspension Wear and Tire Costs**

The MKZ s suspension is not as rigid as some German luxury sedans, leading to **excessive body roll** and a softer ride. Over time, **struts, bushings, and control arms** wear out, requiring replacements (typically **$500 $1,500 per corner**).

Additionally, the **tires wear quickly** due to the softer ride, and premium tires (recommended for luxury vehicles) add to maintenance costs.

4. **Infotainment and Tech Glitches**

The **SYNC 3 system** is functional but can be **slow, unresponsive, or prone to software freezes**. Some users report issues with:

- Bluetooth connectivity

- Apple CarPlay/Android Auto lag

- Touchscreen responsiveness

- Radio or climate control malfunctions

While not critical, these can be frustrating over time.

5. **Interior Quality Variability**

Lower trims (e.g., **Premium**) use **plastic-heavy materials** that feel less premium than higher trims. Higher trims (e.g., **Reserve, Black Label**) have better materials, but even then, some owners report **cheap-feeling plastics** and **poor stitching quality**.

6. **Rust Concerns (Especially in Snowy Regions)**

The MKZ has had **rust issues** in the **wheel wells, rocker panels, and undercarriage**, particularly in areas with salted roads. A **thorough inspection** of these areas is essential before purchase.

7. **Resale Depreciation**

While the MKZ holds value better than some competitors, luxury sedans still depreciate significantly. If you plan to sell it in **3 5 years**, you may not recover as much as you paid.

8. **Potential for Hidden Mechanical Issues**

Like any used vehicle, the **2018 MKZ may have hidden problems**, such as:

- **Exhaust manifold leaks** (common in EcoBoost engines)

- **Oil consumption** (some owners report the engine burns oil, requiring frequent top-ups)

- **Water pump failures** (can lead to overheating)

- **CV axle wear** (common in AWD models)

A **pre-purchase inspection (PPI) by a Lincoln specialist** is **highly recommended**.

9. **Limited Enthusiast Appeal**

While the rack and pinion makes it more mod-friendly, the MKZ is not a **performance-oriented** car. If you re looking for a **track or drift project**, it may not be the best choice compared to a Mustang or F-150.

10. **Higher Maintenance Costs Than Mass-Market Cars**

Lincoln dealerships charge **premium labor rates**, and parts (especially after warranty) can be expensive. Independent mechanics may not be familiar with the vehicle, leading to higher repair costs.

---

### **Ending Conclusion**

The **2018 Lincoln MKZ 3.0L Turbo with the Lincoln 639900 rack and pinion** is an **interesting but high-maintenance** purchase. It offers **strong performance, decent fuel economy, and a comfortable ride**, but the **rack and pinion steering system is a major red flag** many owners report **noise, play, and costly repairs**.

If you **prioritize performance tuning or a sharper steering feel**, the rack and pinion may be worth it, but you must **budget for potential steering repairs**. If you **value reliability and comfort**, a vehicle with the **original hydraulic steering** might be a safer choice.

**The biggest risks are:**

- **Steering rack failure** (could cost **$1,500 $2,500 ** to fix)

- **Transmission issues** (if dual-clutch, expect **$3,000 $5,000** for a rebuild)

- **Hidden mechanical problems** (oil consumption, exhaust leaks, etc.)

**If you proceed, ensure:**

**A thorough pre-purchase inspection** (especially steering, transmission, and undercarriage).

**Full service records** (oil changes, fluid flushes, TSB compliance).

Details:

Drain and replace engine oils to manufacture suggested levels. The example companies, organizations, products, people and events depicted herein are fictitious. Install new belts and hoses. Scan, record and clear all codes before removing original unit.

DIFFERENTIALS Install new filter kit. Airbags are not tested to meet any safety standards. You are expected to check this page from time take notice of any changes we made, as they binding on you.

Scan, record and clear all codes before removing the original unit. RECOMMENDED INSTALLATION/REPLACEMENT PROCEDURES ENGINES This part fits vehicles made in the following years 2017, 2018. Install new spark plugs wires.

Transmissions: are warrantied to be in good working order against any slippage or shifting failures. If needed, replace timing gears, chains or belts gaskets. All other parts included are considered accessories or extra. Residential Address: Curbside delivery only.

Replace valve cover gaskets. Buyer accepts all risk of damages/injuries if not installed properly. Airbags must be installed in accordance with vehicle manufacturers specifications. Any rights not expressly granted herein are reserved.

Adjust throttle position sensor cable. Items marked Sold AS-IS are final sale with no warranty. Warranty Information: Please review the listing for specific warranty details. A daytime phone number is required to schedule the delivery.

Flush cooling system re-fill to proper level. Items will not be released without it. Used tires are not tested or labeled by MAS to meet any safety standards. Fill transmission with manufacturer specified fluid.

Replace all seals. Flush and inspect cooling lines. Replace oil, air and fuel filters. TRANSMISSIONS/TRANSFER CASES 1.

Replace thermostat gasket. And engage torque converter into front pump. Manufacturer Brand: Color: Position: Fitment Notes. Replace oil pan gasket and rear main seal.

Differentials: All internal lubricated parts within the drive axle housing are guaranteed in good working condition at time of purchase.

part #: 639900 prices

  • $429.90-$469.99

specifications steragebo:

  • for models: Turbo, Mkz
  • for makes: Lincoln
  • for years: 2018
  • mpn: 639900
  • manufacturer warranty: 6 Month
  • genuine oem: Yes
  • seller notes: Sed 4wd Prod Date
  • interchange item code: 551
  • color: Grey
  • compatibility: Mkz 17-18 3.0l
  • type: Rack And Pinion Assembly

seller steragebo:

  • city: Camden, New Jersey
  • # reviews: 31612
  • rating: 99.1%

payments steragebo:

  • other
  • credit card: Visa
  • wallet: Apple-pay

returns steragebo:

  • time: 30 Days
  • paid by: Seller
  • policy: Returns Accepted

shipping steragebo:

  • service: FedEx Ground / FedEx Home Delivery
  • carrier: FedEx
  • cost: $0.00
  • type: Fixed
  • class: Standard
  • transit: 4-7 Days

offer steragebo:

  • availability: In Stock
  • best offers: True
  • sold: 0
  • options: Ship-to-home
  • started: March 26, 2026
  • quantity: 1

general steragebo:

  • condition: Used
  • Car Truck Parts Accessories > Steering Suspension > Gearboxes, Rack Pinions
for models: turbo, mkz, for makes: lincoln, for years: 2018, manufacturer warranty: 6 month, genuine oem: yes, seller notes: sed 4wd prod date, interchange item code: 551, compatibility: mkz 17-18 3.0l, type: rack and pinion assembly,
manufacturer: lincoln, category: auto parts > car truck parts accessories > steering suspension > gearboxes, rack pinions, color: grey, sku: 18551441051567793,
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  • Used. Offer #1 priced at $429.90 + $0.00 shipping estimate = $429.90* total. FREE SHIPPING
  • Used. Offer #2 priced at $469.99 + $0.00 shipping estimate = $469.99* total. FREE SHIPPING

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