BMW 6774374 Steering Rack Pinion Automatic Trans

( Manufacturer Part Number: 6774374 ), ( Part Type: Steering Pinion Rack Tran )

Review BMW Steering Rack And Pinion Automatic Trans Oem fits Z4 E85 E86

The **BMW Z4 (E85/E86) Steering Rack Pinion (Part Number: 6774374) for Automatic Transmission Models** represents a precision-engineered component essential for the smooth, responsive, and accurate handling that defines the Z4 s sporty roadster character. Designed to seamlessly integrate with the E85 (2002 2008) and E86 (2009 2016) generations of this iconic two-seater, this steering rack pinion is a critical element of the vehicle s front-wheel-drive steering system, ensuring optimal power transfer from the driver s input to the wheels while maintaining the Z4 s signature blend of agility and comfort. Crafted from high-grade materials and engineered to BMW s exacting standards, the pinion features a robust helical gear design that minimizes noise, vibration, and harshness (NVH) during operation, even under the dynamic demands of spirited driving or high-speed cruising. Its precision-machined teeth and optimized tooth geometry enhance durability, reducing wear and extending the lifespan of the entire steering assembly, which is particularly important for enthusiasts who push their Z4s to their limits on track days or winding coastal roads. The pinion s compatibility with automatic transmission models ensures seamless integration with the Z4 s smooth-shifting six-speed or eight-speed Getrag transmissions, delivering consistent steering feel whether the vehicle is coasting in neutral or accelerating under power. Whether restoring a classic E85 or upgrading an E86 for improved performance, this steering rack pinion is a vital replacement part for owners seeking to restore factory precision, eliminate play or stiffness in the steering column, or address wear from years of spirited driving. Its installation requires careful alignment and torque specifications to maintain the Z4 s exacting handling balance, making it a must-have component for those who demand nothing less than perfection from their BMW.

### **Pros and Cons of Buying a BMW Z4 (E85/E86) with Steering Rack Pinion and Automatic Transmission**

#### **Pros**

1. **Driving Experience and Handling**

The BMW Z4, particularly in the E85/E86 generations, is renowned for its engaging road manners. The steering rack pinion setup (common in later E86 models) provides sharper, more direct feedback compared to earlier rack-and-pinion designs, enhancing precision and driver involvement. The lightweight chassis and rear-wheel-drive layout contribute to a sporty, nimble feel, making it enjoyable for both spirited driving and daily use.

2. **Automatic Transmission Reliability**

The automatic transmission (likely a ZF 5HP19 or 5HP24, depending on the model year) is generally robust if well-maintained. Modern automatic transmissions in BMWs are far more reliable than older manual-only setups, offering smoother shifts and better fuel efficiency in stop-and-go traffic. With proper servicing, it can last well beyond 100,000 miles.

3. **Timeless Design and Resale Value**

The Z4 s retro-styled coupe and roadster bodies retain strong appeal, especially in the E85/E86 era. While not as valuable as a M3 or Z8, a well-preserved Z4 holds its price better than many contemporaries. The classic aesthetic ensures it remains desirable among BMW enthusiasts and collectors.

4. **Performance Potential**

The Z4 is available in several performance variants, including the **Z4 sDrive35i** (N52/N54 engine) and **Z4 M3** (S54), which deliver strong power-to-weight ratios and track-ready capabilities. Even base models benefit from BMW s tuning philosophy, offering a balance of power and efficiency. The E86 models (2009 2016) introduced more refined engines (N54, N55) with direct injection and turbocharging, improving both performance and fuel economy.

5. **Luxury and Comfort**

BMW s signature interior quality shines in the Z4, with high-quality materials, ergonomic controls, and a premium feel. The cabin is spacious for a roadster, with good sound insulation and a comfortable ride, making it suitable for both city driving and long trips. Features like heated seats, leather upholstery, and advanced infotainment (in later models) add to the luxury experience.

6. **Convertible Convenience**

The Z4 s soft-top mechanism is one of its strongest selling points. The E85/E86 models feature a more refined, quieter retracting roof compared to earlier generations, and the roadster configuration is highly practical for warm-weather driving. The ability to switch between coupe and convertible modes on demand adds versatility.

7. **Aftermarket and Modding Support**

The Z4 has a dedicated following, with a thriving aftermarket scene. Performance upgrades (exhaust, suspension, engine tuning), aesthetic modifications (body kits, wheels), and interior enhancements are widely available. The E86 platform, in particular, benefits from modern tuning solutions that can significantly boost power and handling.

8. **Fuel Efficiency (Compared to Other BMWs)**

While not a hybrid or diesel, the Z4 s turbocharged engines (especially the N55 in later models) offer better fuel economy than naturally aspirated BMWs of the same era. The automatic transmission also helps in urban driving, reducing fuel consumption compared to a manual.

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#### **Cons**

1. **Maintenance Costs and Complexity**

BMWs, especially those with high-performance or luxury features, are notorious for expensive maintenance. The Z4 s complex systems including the automatic transmission, turbocharged engines, and suspension components require specialized knowledge and high-quality parts. Routine services (oil changes, timing belt replacements, suspension refreshes) can add up quickly. The E86 s N54 engine, while powerful, is prone to carbon buildup, oil leaks, and turbocharger failures if not properly maintained.

2. **Rust and Structural Issues**

Many early Z4 models (especially E85s) suffer from rust, particularly in the wheel arches, sills, and undercarriage. Even later E86 models can develop rust if they were exposed to harsh conditions. A thorough inspection of the chassis and underbody is essential before purchasing. Structural corrosion can compromise safety and long-term reliability.

3. **Transmission Wear and Teething Problems**

While automatic transmissions in BMWs have improved, some early ZF 5HP19 units (found in pre-2010 models) can develop issues like rough shifting, delayed engagement, or solenoid failures. Later models with the 5HP24 are more refined but still require regular fluid changes and servicing. Some owners report that automatic transmissions in the Z4 can be less durable than in other BMWs, particularly under aggressive driving conditions.

4. **Engine Reliability Concerns**

- **N52 (E85, pre-2008):** The base engine in early Z4s is a naturally aspirated inline-6 with known issues, including timing chain stretch, oil leaks, and valve cover gasket failures. It s less powerful and more prone to wear than turbocharged alternatives.

- **N54 (E85/E86, 2008 2016):** The twin-turbo inline-6 is powerful but infamous for carbon buildup (requiring a valve cleaning every 60,000 80,000 miles), oil leaks (valve cover, oil filter housing), and turbocharger failures. The E86 s N54 is slightly refined but still requires vigilant maintenance.

- **N55 (E86, 2010 2016):** The direct-injection variant is more efficient but prone to carbon buildup and fuel system issues. The N55 s vanos (variable valve timing) can also develop problems if not serviced regularly.

5. **Suspension and Handling Wear**

The Z4 s suspension is tuned for sportiness, which means components like bushings, shocks, and control arms wear out faster than in a luxury sedan. Many owners report that the suspension loses its sharpness after 50,000 80,000 miles, requiring refreshes or upgrades. The steering rack pinion (in E86s) is more durable than earlier setups but can still develop play or stiffness over time.

6. **Convertible Practicality**

While the Z4 s soft-top is a major selling point, it also introduces practical limitations. The roof mechanism can be finicky, especially in windy conditions or after heavy use. The roadster configuration reduces cargo space and passenger comfort in cold or rainy weather. Some owners find the convertible top noisy or difficult to operate, particularly in older models.

7. **Depreciation and Market Saturation**

The Z4, despite its cult following, depreciates quickly compared to other BMWs like the 3 Series or 5 Series. The market is saturated with used examples, which can drive prices down. While well-maintained examples hold value, a poorly cared-for Z4 can become a money pit. The E86 generation is slightly more valuable than the E85 but still not as stable as a 3 Series.

8. **Noise and Vibration Issues**

Some Z4 models, especially those with aftermarket exhausts or worn suspension, can develop excessive road noise or wind noise at highway speeds. The cabin can also feel noisy in certain configurations, particularly with aftermarket wheels or tires that aren t properly balanced.

9. **Limited Off-Road Capability**

The Z4 is not designed for off-road use. Its lightweight chassis, low ground clearance, and lack of four-wheel drive make it unsuitable for rough terrain. Even minor off-road excursions can lead to suspension damage or underbody rust.

10. **Resale Value Uncertainty**

While the Z4 retains a niche appeal, its resale value is unpredictable. Unlike a 3 Series or M3, which have strong secondary markets, the Z4 s value depends heavily on its condition, mileage, and the buyer s preference for classic BMWs. Some owners may find it harder to sell than other BMW models.

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### **Conclusion**

The BMW Z4 (E85/E86) with a steering rack pinion and automatic transmission is a compelling choice for buyers who prioritize driving enjoyment, luxury, and the convertible experience. Its sporty handling, refined engines (especially in later N54/N55 models), and timeless design make it a joy to own for enthusiasts. However, the high maintenance costs, potential engine and transmission issues, and structural concerns (particularly rust) require careful consideration.

- Buyers who value driving dynamics and the convertible lifestyle.

- Those who can commit to regular, high-quality maintenance.

- Enthusiasts who appreciate BMW s tuning philosophy and the aftermarket scene.

- Individuals who prioritize aesthetics and luxury over long-term cost savings.

- Budget-conscious buyers, as maintenance and repairs can be expensive.

- Those who prefer bulletproof reliability over sporty performance.

- Owners who live in areas with harsh winters or poor road conditions (risk of rust and suspension damage).

- Buyers who want a BMW with higher long-term resale value (e.g., 3 Series, 5 Series).

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### **Recommendation**

If you re considering a BMW Z4 (E

Details:

Standard ID: BMWE85E86. Notes: Good Working Condition. Storage Location: OE. Condition: used.

part #: 6774374 prices

• $181.93-$274.99

specifications steragebo:

• for models: Z4, E85, E86
• for makes: Bmw
• mpn: 6774374
• part type: Steering Pinion Rack Tran

general steragebo:

• condition: Used
• Car Truck Parts Accessories > Steering Suspension > Gearboxes, Rack Pinions

payments steragebo:

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

returns steragebo:

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

shipping steragebo:

• service: Economy
• type: Fixed
• cost: $0.00
• class: Economy
• transit: 4-7 Days

seller steragebo:

• rating: 99.9%
• city: Portland, Oregon
• # reviews: 21196

offer steragebo:

• started: April 9, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock

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