FEL-PRO BS-40683 Rear Crankshaft Seal Kit 614046875241 Bs

( Brand: Fel-pro ), ( Manufacturer Part Number: BS-40683 ), ( Part Type: Seal Crankshaft ), ( Product Type: Engine ), ( UPC: 614046875241 ), ( Fitment Type: Direct Replacement ), ( Compatible Make S : Chevrolet, Gmc, Hummer ), ( Compatible Model S : Silverado 2500 Hd, Silverado 3500 Hd, Silverado 3500 ), ( Fitnote: 2500 Hd / 3500 / 3500 Hd ), ( Product Subtype: Crankshafts ), ( Placement On Vehicle: Rear ), ( Product Details: Engine Crankshaft Seal ), ( Engine Version: 294 Gm ), ( 364 Gm: Ls Small Block Gen Iv ), ( Department: Replacement )

Review FEL PRO Gmc Hd Bs 40683 Rear Crankshaft Seal Kit fits SIERRA 2500 2001–2023

The **Fel-Pro BS-40683 Rear Crankshaft Seal Kit** is a premium, high-performance replacement solution meticulously engineered to restore critical sealing integrity to the rear main seal assembly on GMC Sierra 2500 models spanning the years 2001 through 2023. Designed with precision and built to exacting standards, this kit delivers an unmatched combination of durability, reliability, and leak resistance, ensuring a tight, long-lasting seal that safeguards against oil leaks one of the most common and costly failures in heavy-duty truck transmissions. Crafted from Fel-Pro s proprietary **EPDM (Ethylene Propylene Diene Monomer) rubber compound**, this seal is formulated to withstand extreme temperatures, aggressive chemical exposure, and the relentless mechanical stress of high-torque applications, making it an ideal choice for both original equipment replacement and performance-oriented upgrades. The kit includes a **high-quality, reinforced seal with a precision-machined lip design**, optimized for smooth engagement with the crankshaft s polished surface, minimizing friction while maximizing sealing efficiency. Complementing the seal is a **metal-reinforced backing plate**, which provides structural support and ensures proper alignment during installation, reducing the risk of seal distortion or premature wear. Fel-Pro s reputation for superior quality is further reinforced by the inclusion of **high-grade lubricants and installation aids**, such as anti-seize compounds and alignment tools, which simplify the fitting process and help prevent common installation-related failures. Whether addressing a persistent oil leak, preparing for a transmission rebuild, or upgrading as part of a routine maintenance routine, this kit offers truck owners and professional mechanics a trusted, long-term solution that exceeds OEM specifications. Built to endure the demands of heavy-duty towing, off-road adventures, or daily commercial use, the Fel-Pro BS-40683 ensures peace of mind with every mile driven, delivering the kind of performance and longevity that keeps GMC Sierra 2500 owners on the road without interruption.

The **Fel-Pro BS-40683 Rear Crankshaft Seal Kit** is a popular aftermarket option for replacing the rear main seal (RMS) on GMC Sierra 2500 trucks (2001 2023, V8 engines). Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Fel-Pro BS-40683 Rear Crankshaft Seal Kit**

1. **High-Quality Materials**

Fel-Pro is a well-respected brand known for durable, high-performance seals. Their RMS kits are designed to withstand the heat, pressure, and stress of heavy-duty applications, reducing the risk of premature failure.

2. **Proper Fitment and Compatibility**

The BS-40683 is specifically engineered for GM V8 engines (including the LS-series and older small-block V8s in the 2001 2023 Sierra 2500). It includes all necessary components (seal, gasket, bolts, and sometimes a torque converter adapter) to ensure a proper installation.

3. **Reduced Oil Leaks**

One of the primary reasons for replacing an RMS is oil leakage into the transmission or crankcase. Fel-Pro s seals are designed to create a tight, reliable barrier, minimizing leaks and extending the life of both the engine and transmission.

4. **Ease of Installation**

Fel-Pro kits are typically pre-packaged with clear instructions and often include tools or guides for proper installation. While the job is labor-intensive, the kit simplifies the process compared to using OEM parts or generic aftermarket alternatives.

5. **Warranty and Reliability**

Fel-Pro offers a warranty (usually 12 24 months) on their seals, providing peace of mind against defects. Many users report long-term reliability, especially when installed correctly.

6. **Cost-Effective Compared to OEM**

While not the cheapest option, Fel-Pro s RMS kits are often more affordable than GM s original equipment parts, offering better value for performance.

7. **Compatibility with Aftermarket Mods**

If your truck has been modified (e.g., turbocharged, high-performance tuning), Fel-Pro s seals are designed to handle increased stress, making them a better choice than standard OEM seals.

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### **Cons of the Fel-Pro BS-40683 Rear Crankshaft Seal Kit**

1. **Labor-Intensive Installation**

Replacing an RMS requires removing the transmission, torque converter, and sometimes the flywheel or flexplate. This is a multi-hour job that may require specialized tools (e.g., a seal driver, torque converter puller, and proper alignment tools). DIYers without experience may struggle.

2. **Potential for Improper Installation**

If not installed correctly such as not properly aligning the seal or failing to torque bolts to specification leaks can still occur. Improper installation can also damage the crankshaft or transmission components.

3. **Cost of Additional Parts**

- A new torque converter (if damaged during removal).

- A new flexplate or flywheel (if warped or damaged).

- Transmission fluid and filter (recommended during the job).

- Specialty tools (e.g., a seal installer, torque converter puller).

These extra costs can add up, making the total project more expensive than anticipated.

4. **Risk of Damage During Removal**

If the old seal is stuck or the crankshaft is misaligned, there s a chance of damaging the transmission housing, crankshaft, or seal bore. This could require additional repairs.

5. **Limited Availability of Installation Guides**

While Fel-Pro provides instructions, some users find the process confusing without visual aids or step-by-step videos. Online forums (e.g., TruckForum, Reddit) can be helpful, but they may not cover every variation of the 2001 2023 Sierra 2500.

6. **Potential for Early Failure in Aggressive Applications**

While Fel-Pro seals are robust, extreme conditions (e.g., heavy towing, extreme heat, or high-performance modifications) may still lead to premature wear if the seal is not the correct specification for those conditions.

7. **Resale Value Impact**

If you re concerned about resale value, a transmission rebuild or RMS replacement may deter some buyers, though this is more of a concern for high-mileage or heavily modified trucks.

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### **Conclusion**

The **Fel-Pro BS-40683 Rear Crankshaft Seal Kit** is a strong choice for GMC Sierra 2500 owners needing a reliable, high-performance RMS replacement. Its pros superior materials, proper fitment, reduced leaks, and warranty support outweigh its cons for most applications. However, the labor-intensive installation and potential for additional costs (tools, parts) are significant drawbacks, especially for DIYers without mechanical experience.

If your truck is showing signs of an RMS leak (oil in the transmission, crankcase, or torque converter), addressing it promptly is crucial to avoid transmission damage. Fel-Pro s kit is one of the best aftermarket options, but it s essential to weigh the cost of professional installation against DIY efforts.

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### **Recommendation**

- Proceed with the **Fel-Pro BS-40683 kit** and invest in the necessary tools (or borrow them). Follow the installation guide meticulously, and consider using a torque converter puller and seal installer to ensure a proper fit.

- Replace the **torque converter** if it s old or damaged during removal.

- Consider **upgrading the flexplate** if it s warped or thin, as this can prevent future issues.

- **Have a professional mechanic** perform the replacement. While the cost will be higher, it ensures proper installation and avoids potential damage to the transmission or engine.

- Ask the shop to inspect the **flexplate, crankshaft, and transmission housing** for wear during the job.

- If your truck is used for **severe towing, off-roading, or high-performance applications**, consider a **higher-end seal** (e.g., **SealMaster or Carter**) that may offer better heat and pressure resistance. Fel-Pro is still a solid choice, but these alternatives may provide extra durability.

- If cost is a major concern, compare the Fel-Pro kit to **OEM GM parts** (if available) or other aftermarket brands like **SealMaster (BS-40683 equivalent)**. While Fel-Pro is premium, some users find comparable options at lower prices.

- If your truck isn t leaking but has high mileage, consider **monitoring the RMS** during routine inspections. Early replacement can prevent costly transmission damage.

**Final Verdict:** The **Fel-Pro BS-40683 is the best aftermarket RMS kit for the GMC Sierra 2500 (2001 2023)**, offering a balance of quality, reliability, and ease of use. However, the success of the installation depends heavily on proper execution whether by a professional or a skilled DIYer. If in doubt, prioritize professional service to avoid compounding problems.

Details:

Engineered and manufactured specifically for repair applications. Rear Crankshaft Seal Kit BS 40683 by Fel-Pro. This premium Product is the best way to go for those looking highest quality replacement that offers supreme levels of quality, performance and reliability. Meets or exceeds all original equipment specifications.

Unsurpassed quality you can trust. Features: Application specific design to ensure a perfect fit. Validated for fit, form, and function.

part #: bs40683 prices

• $42.95-$57.91

specifications cranshafengin:

• for models: 2500, Sierra
• for makes: Gmc
• for years: 2001-2023
• brand: Fel-pro
• mpn: Bs-40683
• part type: Seal Crankshaft
• product type: Engine
• upc: 614046875241
• fitment type: Direct Replacement
• compatible make s : Chevrolet, Gmc, Hummer
• compatible model s : Silverado 2500 Hd, Silverado 3500 Hd, Silverado 3500
• fitnote: 2500 Hd / 3500 / 3500 Hd
• product subtype: Crankshafts
• placement on vehicle: Rear
• product details: Engine Crankshaft Seal
• engine version: 294 Gm
• 364 gm: Ls Small Block Gen Iv
• department: Replacement

returns cranshafengin:

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

shipping cranshafengin:

• service: FedEx Ground / FedEx Home Delivery
• class: Standard
• type: Calculated
• carrier: FedEx
• cost: $19.81
• transit: 3-6 Days

payments cranshafengin:

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

offer cranshafengin:

• sold: 0
• started: June 12, 2026
• availability: In Stock
• quantity: 5
• options: Ship-to-home

seller cranshafengin:

• # reviews: 162227
• rating: 99.3%
• city: Fort Smith, Arkansas

general cranshafengin:

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

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