FEL-PRO BS-40604 Crankshaft Seal Kit 084113737398 Bs

( Brand: Fel-pro ), ( Manufacturer Part Number: BS-40604 ), ( Part Type: Seal Crankshaft ), ( Product Type: Engine ), ( UPC: 084113737398 ), ( Fitment Type: Direct Replacement ), ( Partslink Number: 23503969 ), ( Compatible Make S : Chevrolet, Gmc, Hummer, Am General, Workhorse ), ( Compatible Model S : Tahoe, K1500 Suburban, K2500 Suburban, C2500 Suburban ), ( Product Subtype: Crankshafts ), ( Product Details: Engine Crankshaft Seal ), ( Department: Replacement )

Review FEL PRO Chevy Bs 40604 Crankshaft Seal Kit fits TAHOE 1995–1999

The **Fel-Pro BS-40604 Crankshaft Seal Kit** is a premium, high-performance replacement solution designed specifically for Chevrolet Tahoe models manufactured between 1995 and 1999, featuring the iconic **LS1 V8 engine** (commonly referred to as the "Big Block" or "LS1" platform). This meticulously engineered kit is crafted to address the critical function of sealing the interface between the crankshaft and the engine block, preventing oil leaks that can compromise engine integrity, performance, and longevity. Engineered with **Fel-Pro s proprietary high-performance materials**, including a **reinforced rubber compound with embedded fiberglass reinforcement**, this seal kit ensures superior durability, resistance to oil degradation, and an optimal compression fit to maintain a leak-free seal under high-pressure conditions. The design incorporates a **precision-molded lip profile** that adapts seamlessly to the crankshaft s contours, reducing stress points and minimizing the risk of premature failure even under the demanding thermal and mechanical stresses of high-performance driving or extended engine use. Beyond its functional excellence, the Fel-Pro BS-40604 kit is built for ease of installation, featuring a **pre-lubricated seal surface** that simplifies fitting and reduces the potential for damage during assembly. Whether addressing a persistent oil leak, preparing for a major engine overhaul, or upgrading as part of a performance build, this kit delivers the reliability and performance expected from Fel-Pro a brand synonymous with automotive excellence and engineering precision. Trusted by mechanics and enthusiasts alike, the Fel-Pro BS-40604 is the ideal choice for restoring and maintaining the integrity of your Tahoe s LS1 engine, ensuring optimal operation for miles to come.

The **Fel-Pro BS-40604 Crankshaft Seal Kit** is a popular aftermarket option for replacing the front crankshaft seal on 1995 1999 Chevrolet Tahoes with the **4.3L V6 (LS1-based)** and **5.0L V8 (LS1-based)** 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-40604 Crankshaft Seal Kit**

1. **High-Quality Materials**

- Fel-Pro is a well-respected brand known for using durable, high-performance materials in its seals. The kit includes a **nitrile rubber seal** reinforced with a **steel spring**, which helps maintain proper tension and prevent oil leaks over time.

2. **Proper Fitment**

- The BS-40604 is specifically designed for the **1995 1999 Chevy Tahoe (and related GM vehicles)** with the **4.3L V6 (LS1) and 5.0L V8 (LS1)** engines. It accounts for the correct seal diameter, flange thickness, and mounting orientation, reducing the risk of installation errors.

3. **Easy Installation**

- The kit includes **pre-lubricated seals**, making installation smoother and reducing friction during press-in. The **spring-loaded design** helps ensure a tight seal without excessive force.

- Fel-Pro provides clear installation instructions, and the seal is designed to fit standard tools (like a seal driver or press).

4. **Reliability and Longevity**

- Fel-Pro seals are known for lasting **50,000 100,000 miles** under normal conditions, especially if the engine is properly maintained (clean oil, no excessive heat or contamination).

- The **steel spring reinforcement** helps the seal maintain its shape and elasticity, reducing the likelihood of premature failure.

5. **Widely Available and Affordable**

- Fel-Pro is a mass-produced brand, so the BS-40604 is **easily found at auto parts stores, online retailers (Amazon, RockAuto, Summit Racing), and through dealerships**.

- Pricing is competitive compared to OEM (original equipment manufacturer) seals, typically ranging from **$20 $40 for the kit**, depending on the retailer.

6. **Good Compatibility with Aftermarket Parts**

- Since the LS1 engines (especially the 5.0L) are popular for modifications, Fel-Pro s seal is often used alongside **aftermarket pulleys, water pumps, and accessory drives**, ensuring compatibility.

7. **Positive User Feedback**

- Many owners report **fewer leaks and longer-lasting performance** compared to cheaper generic seals. Fel-Pro s reputation for quality is well-documented in forums (like **LS1Tech, Chevy101, and Reddit s r/LS1**).

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### **Cons of the Fel-Pro BS-40604 Crankshaft Seal Kit**

1. **Not OEM-Level Durability (But Still Strong)**

- While Fel-Pro is high-quality, it is **not an exact OEM replacement** in terms of material composition or longevity. OEM seals (if available) may last slightly longer, but Fel-Pro is still a **superior aftermarket option**.

- Some enthusiasts prefer **AAR (Automotive Applications Research) or Gates** seals for extreme durability, but Fel-Pro strikes a good balance between cost and performance.

2. **Potential for Installation Challenges**

- If the **front cover is warped, the crankshaft is bent, or the seal bore is damaged**, the new seal may not seat properly, leading to leaks.

- **Over-tightening the cover bolts** can distort the seal or damage the crankshaft pulley area. Proper torque specifications (usually **60 70 ft-lbs**) must be followed.

3. **Limited Warranty (If Any)**

- Fel-Pro does not offer a **long-term warranty** on individual seals (unlike some OEM or high-end brands). If the seal fails prematurely due to manufacturing defects, returns may be difficult.

4. **Requires Proper Preparation**

- The **crankshaft pulley, front cover, and seal bore** must be **clean and free of debris** before installation. Any oil residue or gasket material left behind can cause leaks.

- If the **water pump or tensioner is being replaced**, additional steps (like flushing the cooling system) may be needed, adding to labor time.

5. **Not Ideal for Extreme Modifications**

- For **high-performance or turbocharged LS1 engines**, some users prefer **high-temperature seals** (like those from **AAR or Gates**) to handle increased heat and stress. Fel-Pro is fine for **street-driven or mild performance builds**.

6. **Potential for Counterfeit Products**

- Since Fel-Pro is widely available, **counterfeit or low-quality knockoffs** can sometimes appear on marketplaces like eBay or Amazon. Buying from **reputable retailers (RockAuto, Summit Racing, local auto parts stores)** reduces this risk.

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### **Conclusion**

The **Fel-Pro BS-40604 crankshaft seal kit** is an **excellent choice** for replacing the front seal on a **1995 1999 Chevy Tahoe with a 4.3L or 5.0L LS1 engine**. It offers a **strong balance between cost, quality, and ease of installation**, making it suitable for **DIY mechanics and shops alike**.

High-quality nitrile rubber with steel spring reinforcement

Proper fitment for LS1 engines

Easy installation with pre-lubricated seals

Reliable performance (50K 100K miles under normal conditions)

Widely available and affordable

Not OEM-level (but still superior to most aftermarket alternatives)

Requires careful installation to prevent leaks

No long-term warranty

Not ideal for extreme high-performance applications

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### **Final Recommendation**

- You need a **reliable, high-quality seal** for your **1995 1999 Tahoe s LS1 engine**.

- You are **comfortable with a DIY installation** (or have a trusted mechanic do it).

- You want a **cost-effective solution** that won t break the bank.

- Your engine is **not heavily modified** (no forced induction, extreme boost, or aggressive tuning).

- You have a **high-performance or turbocharged LS1** and want **maximum durability** (consider **AAR or Gates seals**).

- You suspect **crankshaft or cover damage** and need a **premium seal** (like **Duralast or Gates**).

- You want **extended warranty coverage** (some brands offer limited warranties).

**Best Overall Choice:** The **Fel-Pro BS-40604 is the best all-around option** for most **1995 1999 Tahoe owners** due to its **proven reliability, ease of use, and affordability**. Just ensure proper installation and maintenance to maximize its lifespan.

Details:

Features: Application specific design to ensure a perfect fit. This premium Product is the best way to go for those looking highest quality replacement that offers supreme levels of quality, performance and reliability. Replaces Original OE Part #: 23503969. Validated for fit, form, and function.

Crankshaft Seal Kit BS 40604 by Fel-Pro. Engineered and manufactured specifically for repair applications. Unsurpassed quality you can trust. Meets or exceeds all original equipment specifications.

part #: bs40604 prices

• $36.99-$51.70

specifications cranshafengin:

• for models: Tahoe
• for makes: Chevy
• for years: 1995-1999
• brand: Fel-pro
• mpn: Bs-40604
• part type: Seal Crankshaft
• product type: Engine
• upc: 084113737398
• fitment type: Direct Replacement
• partslink number: 23503969
• compatible make s : Chevrolet, Gmc, Hummer, Am General, Workhorse
• compatible model s : Tahoe, K1500 Suburban, K2500 Suburban, C2500 Suburban
• product subtype: Crankshafts
• product details: Engine Crankshaft Seal
• department: Replacement

general cranshafengin:

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

payments cranshafengin:

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

returns cranshafengin:

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

shipping cranshafengin:

• transit: 2-4 Days
• service: FedEx Ground / FedEx Home Delivery
• type: Calculated
• class: Standard
• carrier: FedEx
• cost: $18.29

offer cranshafengin:

• quantity: 5
• sold: 0
• started: March 31, 2026
• options: Ship-to-home
• availability: In Stock

seller cranshafengin:

• rating: 99.1%
• city: Saint Paul, Minnesota
• # reviews: 153457

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