The FEL-PRO BS 40640 engine crankshaft seal kit is presented as an OE-equivalent repair option for Chevrolet trucks, offering nitrile elastomer seals with a lip thickness of 1.9–2.2 mm, front and rear seals plus assorted gaskets, and expected life between 60k–100k miles. It’s aimed at restorations and routine service, fits many GM V8 and V6 applications, and demands correct installation, proper crankshaft finish and torque; what are the trade-offs for long-term sealing and fitment?
Key Takeaways
- FEL-PRO BS 40640 is a crankshaft seal kit including front and rear seals plus gaskets for GM trucks like Silverado 1500.
- Seals use nitrile elastomer with ~70 Shore A hardness and 1.9–2.2 mm lip thickness for durable, OEM-like sealing.
- Proper installation—clean bore, light lubricant, correct torque, and ≤1.0 mm runout—is critical for leak-free performance.
- Expected lifespan under normal use is about 60k–100k miles; radial tolerance ±0.1 mm supports reliable fit.
- Verify fitment by VIN, crankshaft bore and seal outer diameter before buying to avoid returns.
Product Features and Specifications
The FEL‑PRO BS 40640 Engine Crankshaft Seal Kit presents a focused set of components engineered to restore front and rear crankshaft sealing on compatible Chevrolet Silverado 1500 applications.
The reviewer notes design benefits: OE-equivalent materials, 1.9–2.2 mm seal lip thickness, and nitrile elastomer composition.
Reviewer highlights OE-grade construction, 1.9–2.2 mm seal lips, and durable nitrile elastomer formulation.
What parts are included? Front seal, rear seal, and gaskets; counts: 2 seals, assorted gaskets.
Installation tips: torque specs, surface prep, and 0.5–1.0 mm runout allowance are emphasized.
Practical considerations: storage temperature limits, recommended replacement interval.
Bullet points: measurements, included parts, material, and essential tools required for proper installation.
Vehicle Compatibility and Fitment Tips
A quick compatibility check saves time and prevents costly returns: the FEL‑PRO BS 40640 is engineered for a range of GM‑platform trucks and SUVs, but fitment varies by year, engine, and trim—confirm year, make, model, engine code, and axle or transmission type before ordering.
The reviewer advises liberation-minded owners to perform compatibility checks, using vehicle VIN and parts diagrams.
Installation tips: measure crankshaft bore diameter (typically 2.50–3.00 in), confirm seal outer diameter, and note engine front cover depth.
Q: How to verify fit?
A: Compare OEM part numbers, use Amazon Confirmed Fit, or consult service manual.
Quality, Performance, and Buying Advice
Having verified fit and measured bore and seal dimensions, attention turns to how the FEL-PRO BS 40640 performs in service and whether it represents a good buy.
Having checked fit and measured dimensions, we now assess how the FEL-PRO BS 40640 performs in service.
The kit shows strong seal durability: lip hardness ~70 Shore A, radial clearance tolerance ±0.1 mm, lifespan estimates 60k–100k miles under normal use.
Performance notes: low friction coating, OEM-spec material, leak-free sealing when installed correctly.
Installation tips: clean bore, light lubricant, torque crank flange to spec.
Q: Is it worth buying?
A: Yes for restorations and repairs, provided compatibility is confirmed and basic tools and skill are available.
Frequently Asked Questions
Does the Kit Include Installation Instructions and Necessary Hardware?
Yes; it includes installation guidance and the necessary components for seal replacement. The user seeks empowerment—clear steps, essential parts, and fit validation liberate them to complete the repair confidently and reclaim control of vehicle maintenance.
Are Replacement Seals Sold Individually or Only as the Full Kit?
Rather than individually, the seals are offered primarily as a full kit—sparking relief like a dawn—while freedom-minded buyers weigh seal compatibility and cost comparison, choosing collective assurance over piecemeal uncertainty for liberated repairs.
What Is the Warranty Period and How Is a Claim Filed?
The warranty details state a limited lifetime warranty; the claim process requires contacting the manufacturer with purchase proof and vehicle information, then following return authorization instructions. The reader-seeker is empowered to insist on rightful, prompt resolution.
Can These Seals Be Used on Modified or Stroked Engines?
“Where there’s a will, there’s a way.” They caution that modified engines and performance upgrades may exceed stock tolerances; seals might fit, yet one should verify dimensions and materials, and prefer specialty parts to guarantee freedom from failure.
Are There Recommended Lubricants or Break-In Procedures for Installation?
Yes. They recommend light assembly lubricants like engine oil or silicone-based sealant; installation tips include light coating, avoid over-tightening, guarantee clean surfaces and proper alignment. The guide empowers liberated mechanics to proceed confidently and independently.
Conclusion
The FEL-PRO BS 40640 kit offers front and rear crankshaft seals with a 1.9–2.2 mm lip thickness, nitrile elastomer construction, and assorted gaskets, suitable for many GM trucks and SUVs. How long will it last? Expect roughly 60,000–100,000 miles of service under normal use. Practical fitment checks, correct torque, and sealant where specified guarantee leak-free performance. Buyers should verify exact vehicle fitment, inspect surfaces, and follow installation specs.
