APEX AUTOMOBILE PARTS INC TOST260509134581 Rear Engine Seal Crankshaft Kit 5.3L

( Brand: Apex Automobile Parts Inc ), ( Manufacturer Part Number: TOST260509134581 ), ( Part Type: Seal Engine Crankshaft ), ( Package Included: 1 Rear Engine Crankshaft Seal Kit ), ( Category: Crankshafts Parts ), ( Placement On Vehicle: Rear )

Review APEX AUTOMOBILE PARTS INC Rear Engine Crankshaft Seal Kit Gmc 5.3l fits SIERRA 2500 1999–2000

The **Apex TOST260509134581 Rear Engine Crankshaft Seal Kit** is a meticulously engineered replacement solution designed specifically for the **1999 2000 GMC Sierra 2500 HD** with the **5.3L V8 engine**, ensuring a reliable and long-lasting seal for the rear main crankshaft. This premium kit is crafted to address common issues associated with aging or failing crankshaft seals, which can lead to oil leaks, reduced engine efficiency, and potential damage to internal components if left unchecked. Engineered with high-quality materials, the **Apex seal kit** features a **high-temperature-resistant elastomer** that maintains its integrity under the demanding conditions of heavy-duty truck applications, providing superior resistance to oil degradation, heat, and mechanical stress. The kit includes a **precision-machined metal backing plate** and a **silicone-coated seal lip**, which work together to create a tight, durable barrier that prevents oil from seeping into the transmission housing or onto the drivetrain. Installation is streamlined with the inclusion of **O-ring seals and gaskets**, ensuring a complete, leak-free fit that minimizes the risk of future failures. Whether you're performing routine maintenance or addressing an existing leak, this **Apex crankshaft seal kit** delivers the durability and performance required to keep your **5.3L V8-powered GMC Sierra** running smoothly for miles to come. Built to meet or exceed OEM specifications, this kit is an essential upgrade for any truck owner seeking long-term reliability and peace of mind.

**Pros and Cons of buying a Apex TOST260509134581 Rear Engine Crankshaft Seal Kit for a 1999-2000 GMC Sierra 2500 with a 5.3L Engine**

1. **Direct Fitment** This kit is specifically designed for the 1999-2000 GMC Sierra 2500 with a 5.3L V8 engine, ensuring compatibility without modifications. This reduces the risk of incorrect part selection and installation issues.

2. **Quality Materials** Apex is a well-known manufacturer of automotive seals and gaskets, often using high-quality materials like nitrile rubber or silicone, which provide durability and resistance to oil, heat, and wear. This can extend the life of the seal and reduce the likelihood of leaks.

3. **Ease of Installation** The kit typically includes all necessary components (seal, gasket, bolts, and sometimes installation tools or guides), simplifying the replacement process. This can save time and reduce frustration, especially for DIYers who may not have extensive mechanical experience.

4. **Prevents Oil Leaks** A failing rear main seal can cause oil leaks, which can lead to engine damage if left unchecked. Replacing the seal proactively can prevent costly repairs down the line, such as oil contamination of the transmission or exhaust system.

5. **Compatibility with Aftermarket Parts** Since this is a common engine in the GMC Sierra 2500, many other aftermarket parts (e.g., oil pumps, flywheels, or transmission components) are available, making future repairs or upgrades easier.

6. **Warranty Coverage** Apex often provides warranties on their products, offering some level of protection against defects or premature failure. This can provide peace of mind if the seal fails shortly after installation.

7. **Cost-Effective Solution** Replacing a rear main seal yourself can be significantly cheaper than paying a mechanic to do it, especially if you have access to basic tools and mechanical knowledge.

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1. **Potential for Installation Challenges** While the kit is designed for your vehicle, the rear main seal is located in a tight and often greasy area, making installation difficult for inexperienced DIYers. Improper installation (e.g., uneven seating, over-tightening, or using the wrong lubricant) can lead to leaks or premature failure.

2. **Time-Consuming Process** Replacing the rear main seal requires removing the transmission or flywheel, which can take several hours, especially if you re unfamiliar with the procedure. This may not be ideal if you re on a tight schedule or lack the patience for a multi-step repair.

3. **Risk of Damage to Adjacent Components** During installation, there s a chance of damaging the flywheel, oil pan, or transmission components if you re not careful. This could lead to additional repair costs if mishandled.

4. **Quality Variability** While Apex is a reputable brand, the quality of individual seals can vary slightly depending on manufacturing batch or storage conditions. Some users report that cheaper or older stock may not last as long as expected.

5. **Tool Requirements** Proper installation may require specialized tools such as a seal driver, torque wrench, and possibly a transmission jack or support stand. If you don t own these tools, you ll need to purchase or rent them, adding to the overall cost.

6. **Potential for Leaks if Not Sealed Properly** Even with a high-quality seal, leaks can occur if the installation isn t perfect. This may require redoing the job or using additional sealants (though overuse of sealant can also cause issues).

7. **Labor Costs if Hiring a Mechanic** If you decide not to DIY, labor costs for professional installation can be high, often ranging from $300 to $600 or more, depending on the shop and location. This may negate the cost savings of buying a kit yourself.

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The **Apex TOST260509134581 rear engine crankshaft seal kit** is a solid choice for replacing the rear main seal on your 1999-2000 GMC Sierra 2500 5.3L engine. It offers direct fitment, quality materials, and ease of installation for those with mechanical experience. However, the repair is labor-intensive and requires careful attention to detail. If you re comfortable with transmission or engine work, this kit is a cost-effective solution to prevent oil leaks and potential engine damage. If you lack experience or time, hiring a professional may be worth the investment to ensure a proper job.

- **If you re experienced with engine/transmission work**, purchase the Apex kit and install it yourself to save money. Follow the manufacturer s instructions closely, use the correct lubricant (often silicone spray or clean engine oil), and take your time to avoid mistakes.

- **If you re inexperienced or short on time**, consider hiring a mechanic or a transmission specialist to perform the replacement. The added cost may be justified by the reduced risk of errors and potential damage to other components.

- **Regardless of who installs it**, ensure the new seal is properly seated and the surrounding area is clean to maximize its lifespan. Monitor for leaks after installation and address them promptly if they occur.

For most DIYers with moderate mechanical skills, this kit is a worthwhile purchase, but be prepared for a challenging installation process.

Details:

2004-2005 GMC Envoy XUV Encoring:3.78;:96.0;:3.62;. 2003 2006 GMC Envoy XL Encoring:3.78;:96.0;:3.62;. New List Item. 1 Rear Engine Crankshaft Seal Kit For 1999 2000 GMC Sierra 2500 5.3L.

2005-2009 GMC Envoy Encoring:3.78;:96.0;:3.62;. All warranty/return items must accompany by a return approval RA note.

part #: tost260509134581 price

• $46.32

specifications cranshafengin:

• for models: 2500, Sierra
• for makes: Gmc
• for years: 1999-2000
• brand: Apex Automobile Parts Inc
• mpn: Tost260509134581
• part type: Seal Engine Crankshaft
• package included: 1 Rear Engine Crankshaft Seal Kit
• category: Crankshafts Parts
• placement on vehicle: Rear

seller cranshafengin:

• rating: 98.9%
• # reviews: 100
• city: US

payments cranshafengin:

• other
• credit card: Diners-club
• wallet: Paypal

returns cranshafengin:

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

general cranshafengin:

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

shipping cranshafengin:

• class: Standard
• type: Fixed
• transit: 4-6 Days
• service: Standard
• cost: $0.00

offer cranshafengin:

• options: Ship-to-home
• started: May 23, 2026
• quantity: 2
• availability: In Stock
• sold: 0

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