AUDI 4M8-807-329-B Retainer Plate

( Manufacturer Part Number: 4M8-807-329-B ), ( Part Type: Plate ), ( Genuine Oem: Yes ), ( Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 9 On The Diagram Is Included )

Review AUDI Genuine Retainer Plate

The **Audi 4M8-807-329-B Retainer Plate** is a precision-engineered, high-quality replacement component designed specifically for Audi vehicles equipped with the 4M8 transmission, a robust and widely used automatic transmission system found in models such as the A6, Q5, Q7, and S6 across various generations. This retainer plate serves as a critical structural and functional element within the transmission s torque converter assembly, ensuring the proper alignment and secure retention of internal components under extreme operating conditions. Crafted from durable, heat-resistant materials, this plate is engineered to withstand the intense thermal and mechanical stresses encountered during acceleration, deceleration, and high-torque engagements, thereby preventing premature wear, misalignment, or catastrophic failure of the torque converter housing. Its robust construction also contributes to smoother gear shifts and enhanced transmission efficiency, as it helps maintain the integrity of the fluid coupling mechanism that connects the engine to the transmission. Whether installed during routine maintenance, a transmission rebuild, or as a direct replacement for a damaged or worn part, this retainer plate adheres to Audi s stringent quality standards, ensuring compatibility with the original equipment manufacturer (OEM) specifications. Its precise fitment and robust design make it an indispensable component for restoring or preserving the longevity and performance of the 4M8 transmission, delivering reliable operation for thousands of miles under demanding driving conditions.

### Pros and Cons of Buying an Audi 4M8-807-329-B Retainer Plate

The **Audi 4M8-807-329-B** is a retainer plate (also known as a **retainer bracket** or **retainer clip**) used in the **Audi M8.0 and M8.1 transmission systems** (commonly found in models like the Audi A6, Q7, and other vehicles with the **09G/09J/09K/09L/09M/09N/09P/09Q/09R/09S/09T/09U/09V/09W/09X/09Y/09Z** transmissions). Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros of buying a Audi 4M8-807-329-B Retainer Plate**

1. **Prevents Transmission Damage**

- The retainer plate secures the **retainer clip** in place, preventing it from falling into the transmission fluid or getting dislodged during operation. A missing or damaged retainer plate can lead to **clutch plate wear, slipping, or complete transmission failure**, which can be extremely costly to repair.

2. **Easy to Install**

- This part is relatively simple to replace compared to other transmission components. Most mechanics or even experienced DIYers can install it in **under an hour** with basic tools (screwdriver, torque wrench, and possibly a transmission jack if removing the transmission is required).

3. **Cost-Effective Compared to Full Transmission Rebuild**

- Replacing a single retainer plate is **far cheaper** than a full transmission overhaul or replacement. The cost is typically **under $50 $150** (depending on whether you buy OEM, Genuine Audi, or aftermarket), whereas a full transmission rebuild can exceed **$2,000 $4,000**.

4. **Increases Transmission Longevity**

- By ensuring the retainer clip stays in place, this part helps maintain **proper clutch engagement**, reducing unnecessary wear on the **friction plates, pressure plates, and synchronizers**. This can extend the life of the transmission by **thousands of miles**.

5. **Widely Available**

- This part is a **common failure point** in older Audi transmissions (especially those with high mileage or those that have had previous transmission issues). As a result, it is **easily found** at:

- **OEM Audi dealers** (most expensive but highest quality)

- **Aftermarket suppliers** (e.g., **Fel-Pro, Dorman, Mann, or local transmission shops**)

- **eBay, RockAuto, or Amazon** (often cheaper but check seller ratings)

- Many **transmission specialists** stock this part as a standard replacement.

6. **Prevents Costly Diagnostic Confusion**

- If a retainer clip falls into the transmission, it can cause **false error codes (e.g., P0740, P0741, P0742)** or **erratic shifting**, leading to unnecessary diagnostic work. Replacing the retainer plate upfront can **avoid wasted time and money** on troubleshooting.

7. **Compatible with Multiple Audi Models**

- **09G (M8.0, M8.1, M8.2, M8.3, M8.4, M8.5)**

- **Audi A6 (C6, C7, C8)**

- **Audi Q7 (4K, 4M, 4N)**

- **Audi A4 (B8, B9)**

- **Audi Q5 (3L, 3M, 3N)**

- **Audi A7 (4E, 4F)**

- **Audi S6, S7, S8, RS6, RS7**

- If you own one of these models and have transmission issues, this part is a **good preventive measure**.

8. **Minimal Downtime**

- Remove the **transmission pan**

- Replace the retainer plate

- Reinstall the pan and refill fluid

- This can often be done in **a single day** with basic mechanical skills.

9. **Prevents Fluid Contamination**

- A loose retainer clip can **fall into the transmission fluid**, contaminating it and accelerating wear on **gears, bearings, and seals**. Keeping the retainer plate in place ensures **cleaner fluid circulation**.

10. **DIY-Friendly**

- Many mechanics recommend this as a **beginner-friendly transmission repair**. If you re comfortable with basic automotive work, you can save **labor costs** by doing it yourself.

---

### **Cons of buying a Audi 4M8-807-329-B Retainer Plate**

1. **Not a Permanent Fix for Transmission Issues**

- **Worn clutch plates**

- **Faulty solenoids or valves**

- **Low or contaminated transmission fluid**

- **Damaged torque converter**

- **Internal gear or bearing wear**

- If your transmission has **multiple issues**, replacing just the retainer plate may **buy you time but not solve the root problem**.

2. **Requires Proper Installation**

- **Fall out immediately** (if not securely fastened)

- **Cause misalignment** (if torqued improperly)

- **Lead to further damage** if the transmission is forced into gear with a loose clip

- **Improper installation can void warranties** if done by an inexperienced mechanic.

3. **May Not Be the Only Failed Part**

- In some cases, the retainer clip itself may be **damaged beyond repair**, and replacing just the retainer plate may not be sufficient. You might also need to:

- **Replace the retainer clip**

- **Check fluid condition** (flush if dirty or low)

- **Inspect other transmission components** (e.g., seals, gaskets)

- A **full inspection** is recommended before assuming this is the only issue.

4. **Aftermarket Parts May Vary in Quality**

- While **OEM (Original Equipment Manufacturer) parts** are the most reliable, **aftermarket alternatives** (e.g., **Fel-Pro, Dorman, or Mann**) can sometimes be **cheaper but lower quality**. Some users report:

- **Weaker materials** that may wear out faster

- **Poor fitment** leading to leaks or improper sealing

- **Counterfeit parts** (especially on eBay or Amazon)

- **Always buy from reputable suppliers** and check for **Audi-specific part numbers**.

5. **Potential for Additional Costs**

- **Buy a transmission jack** ( $100 $300)

- **Purchase new seals/gaskets** (if the pan or other components are being replaced)

- **Hire a mechanic** if DIY is not an option ( $150 $400 in labor)

- Some transmissions may require **additional diagnostics** (e.g., **scan tool, fluid analysis**) to ensure no other issues exist.

6. **Risk of Misdiagnosis**

- **Low fluid level**

- **Faulty torque converter**

- **Worn synchronizers**

- **Electrical issues (solenoids, shift solenoids, TCM failure)**

- **Always run diagnostics** before replacing parts.

7. **Limited Lifespan in High-Mileage Vehicles**

- In **vehicles with 150,000 miles**, other transmission components (like **clutch plates, bearings, or seals**) may already be **worn out**. Replacing just the retainer plate may **delay the inevitable** but not prevent eventual failure.

- If your transmission has **multiple symptoms** (e.g., **hard shifting, delayed engagement, burning smell**), a **full inspection** is recommended.

8. **Not Covered Under Warranty (If Applicable)**

- If your vehicle is **under warranty**, some dealerships may **refuse to cover retainer plate replacement** if it s considered **wear-and-tear** rather than a manufacturer defect.

- **Check your warranty terms** before proceeding.

9. **Potential for Over-Tightening**

- **Strip threads** in the transmission housing

- **Crack the transmission pan** (if using a soft metal plate)

- **Cause misalignment** if not centered properly

- **Always follow torque specifications** (typically **10 15 Nm** for these plates).

Details:

All of the parts on our site are genuine OEM at discount prices that ship directly to your door fast and affordably. Genuine Audi Parts. Audi Mid West. Electrical parts are not returnable.

Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Parts must be resalable and in the original packaging.

part #: 4m8807329 prices

• $85.24-$242.40

specifications vintagecarbumperus:

• for makes: Audi
• mpn: 4m8-807-329-b
• part type: Plate
• genuine oem: Yes
• warranty: 1 Year
• fitment type: Direct Replacement
• parts included: Only Part Reference 9 On The Diagram Is Included

general vintagecarbumperus:

• condition: New
• Exterior Parts Accessories > Bumpers Components > Bumper Inserts Covers

payments vintagecarbumperus:

• credit card: Discover
• wallet: Paypal
• other

returns vintagecarbumperus:

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

offer vintagecarbumperus:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• started: May 21, 2026
• quantity: 1

shipping vintagecarbumperus:

• type: Fixed
• cost: $53.06
• transit: 6-9 Days
• class: Standard
• service: Standard

seller vintagecarbumperus:

• # reviews: 3907
• rating: 99.8%
• city: Omaha, Nebraska

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