BEST GASKET 3A49 Rear Crankshaft Seal

( Brand: Best Gasket ), ( Manufacturer Part Number: 3A49 ), ( Product Type: Engine ), ( Fitment Type: Direct Replacement ), ( Product Subtype: Crankshafts ), ( Placement On Vehicle: Rear ), ( Type: Seals Gaskets ), ( Product Details: Engine Crankshaft Seal ), ( Department: Replacement )

Review BEST GASKET Rear Crankshaft Seal

The **3A49 Rear Crankshaft Seal** is a precision-engineered sealing component specifically designed for high-performance and reliability in internal combustion engines, particularly those found in Volkswagen Group vehicles such as the 3.0L VR6 engines (commonly used in models like the Audi S6, S8, VW Passat W8, and Porsche 996/997). Crafted from high-quality elastomeric materials, this seal is engineered to withstand extreme temperatures, mechanical stress, and prolonged exposure to engine oils and lubricants, ensuring a tight, leak-free barrier between the crankshaft and the engine block. The 3A49 features a robust, reinforced lip design that maintains optimal sealing pressure even under dynamic conditions, such as engine vibration and torque fluctuations, which are critical for preventing oil leaks and maintaining engine integrity. Its construction incorporates a durable metal reinforcement ring, which provides structural support and enhances durability, reducing the risk of premature wear or failure. This seal is particularly suited for applications where engine longevity and performance are paramount, as it effectively mitigates the ingress of contaminants while preventing the escape of vital lubricants. Whether installed during routine maintenance or as part of a comprehensive engine rebuild, the 3A49 rear crankshaft seal delivers a reliable solution for maintaining engine efficiency and protecting critical components from damage.

### Pros and Cons of Buying a Gasket (3A49 Rear Crankshaft Seal)

The primary advantage of purchasing a genuine or high-quality aftermarket rear crankshaft seal (such as the 3A49 part) is that it helps prevent oil leaks. A failing crankshaft seal can cause significant oil loss, leading to engine damage if left unaddressed. Replacing it ensures proper sealing, maintaining lubrication within the engine and preventing contamination of the transmission fluid.

Using an OEM (Original Equipment Manufacturer) or reputable aftermarket part ensures compatibility with your vehicle s specifications. This reduces the risk of improper fitment, which could lead to further issues such as leaks or premature wear. Additionally, a properly installed seal can extend the lifespan of your engine by maintaining optimal operating conditions.

If you are performing the replacement yourself, a genuine or high-quality seal can save labor costs associated with professional installation. Many aftermarket seals come with detailed installation instructions, making the process more accessible for DIY enthusiasts.

One of the main drawbacks is the cost. Genuine OEM seals can be expensive, especially if you are working on an older or high-end vehicle. Aftermarket options may offer a more budget-friendly alternative, but quality can vary significantly. A low-quality seal might not last as long or could fail prematurely, leading to repeated replacements and additional expenses.

Installing a rear crankshaft seal requires careful disassembly of the engine and transmission, which can be time-consuming and technically challenging. If you lack experience with engine work, mistakes during installation such as improper sealing surface preparation or overtightening can cause leaks or damage to the crankshaft or seal itself. This risk increases the likelihood of needing professional help, which adds to the overall cost.

Even with a high-quality seal, improper installation techniques or using the wrong tools can compromise the seal s effectiveness. For example, not cleaning the crankshaft surface thoroughly or failing to use the correct sealant can result in leaks. Additionally, some seals may require specialized tools or techniques, such as proper torque specifications for the crankshaft nut, which can be difficult to achieve without experience.

Finally, if you are not confident in your ability to diagnose the issue correctly, you might end up purchasing a seal when another component such as the oil pan gasket or transmission seal is actually the source of the leak. This can lead to unnecessary spending and frustration.

---

Replacing a rear crankshaft seal (such as the 3A49 part) is a critical maintenance task that can prevent serious engine damage if done correctly. The benefits of a proper replacement such as preventing oil leaks, maintaining engine health, and ensuring long-term reliability far outweigh the risks if the job is approached with care. However, the challenges of installation difficulty, potential cost, and the risk of mistakes make it a task best suited for those with mechanical experience or access to professional assistance.

---

If you are comfortable with engine work and have the necessary tools, purchasing a high-quality OEM or aftermarket seal (such as the 3A49) is a wise investment. Prioritize a seal from a reputable brand known for durability and compatibility with your vehicle. Follow the manufacturer s installation guidelines closely, and take your time to ensure a clean crankshaft surface and proper sealing. If you are unsure about your ability to perform the replacement correctly, consult a professional mechanic to avoid costly mistakes.

For those who prefer not to tackle the job themselves, investing in professional installation is a safer option, even if it increases the overall cost. Ultimately, the key to a successful replacement lies in using the right parts and paying attention to detail during installation.

Details:

Features: Will provide unmatched quality and dependability. Designed to cover your Gasket and sealing needs. The non-asbestos rope seals available from the big boys are next to impossible trim and do a poor job of sealing. Graphite rope seals are miles ahead of any other seal out there.

This product is distinguished by total quality assurance, unsurpassed anybody else. Made to ensure a proper fit for your vehicle. Ever since the big Gasket manufacturers discontinued using asbestos in 1990, rope rear main seals have been a huge problem to vintage car enthusiast. To ensure exact trimming, each kit includes installation instructions, a special knife, and few other trimming aids.

Rear Crankshaft Seal by Best Gasket. Specifications: Material: Rubber. No hype here - just results. This marvelous material is easy to trim - and it seals.

part #: 3a49 prices

• $49.54-$72.12

specifications cranshafengin:

• brand: Best Gasket
• mpn: 3a49
• product type: Engine
• fitment type: Direct Replacement
• product subtype: Crankshafts
• placement on vehicle: Rear
• type: Seals Gaskets
• product details: Engine Crankshaft Seal
• department: Replacement

general cranshafengin:

• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
• condition: New

returns cranshafengin:

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

payments cranshafengin:

• wallet: Paypal
• credit card: Discover
• other

shipping cranshafengin:

• transit: 5-8 Days
• carrier: FedEx
• cost: $21.07
• class: Standard
• type: Calculated
• service: FedEx Ground / FedEx Home Delivery

seller cranshafengin:

• city: Miami, Florida
• # reviews: 374324
• rating: 99.1%

offer cranshafengin:

• sold: 0
• started: June 4, 2026
• availability: In Stock
• options: Ship-to-home
• quantity: 1

Best Gasket 3A49 Is Similar To:

• 3a45 Best Gasket Oldsmobile Starfire Rear Main Seal (59.1% similar) Rear main seal 3A45 by Best Gasket. Material: rubber. This product is distinguished by total quality assurance, unsurpassed anybody else. The non-asbestos rope seals available from big boys are next to impossible trim and do a poor job of sealing. Ever since the big Gasket manufacturers discontinued...(May 9th, 2018)
• General Motors Gm12552216 Gm Chevrolet 5.3l 6.0 6.2l Ls Gen Iv 58x Tooth Crankshaft Genuine Oem Best Price (32.2% similar) Took apart the entire engine and found a busted cylinder head one piston/rod; this crank has no visual damage...(June 3rd, 2025)