1. Engine Crankshafts Products
  2. sku: 19497977052460773
  3. API PDL 55TRQX

API PDL 55TRQX Front Crankshaft Seal P35

fits make: Gmc. year: 1975–1978.

55trqx Api Pdl Front Crankshaft Seal Fits Gmc P35 1975-1978

( Brand: Api Pdl ), ( Manufacturer Part Number: 55TRQX ), ( Part Type: Seal Crankshaft ), ( Engine: 4.8l 6 Cyl, 5.7l V8 ), ( Compatible Make/model: Gmc P35 ), ( Compatible Years: 1975 1976 1977 1978 75 76 77 78 ), ( Position: Front ), ( Fitment Info: Pdl 1st Design; 2.416 O.d.; 0.375 Width ), ( Manufacturer Warranty: 12 Month Warranty ), ( Attention: Read Full Description To Confirm Fitment ), ( Cs-sku: 400 )

Review API PDL Front Crankshaft Seal Gmc P35 fits 1975–1978

The **API PDL 55TRQX Front Crankshaft Seal** is a high-performance, precision-engineered replacement seal designed specifically for GMC P35 trucks manufactured between **1975 and 1978**, ensuring a reliable and long-lasting solution for maintaining engine integrity. Crafted from a **high-quality, oil-resistant elastomer compound**, this seal is engineered to withstand the demanding conditions of heavy-duty applications, including high temperatures, pressure fluctuations, and constant exposure to lubricants. The **55TRQX series** incorporates advanced sealing technology, featuring a **reinforced lip design** that minimizes leakage while providing superior resistance to oil degradation, ensuring optimal performance even under prolonged use. This seal is meticulously fitted with a **metal-reinforced backing ring** for enhanced durability, preventing deformation and maintaining a tight, consistent seal against the crankshaft journal. Ideal for both professional mechanics and DIY enthusiasts, the **API PDL 55TRQX** is a direct-fit replacement that eliminates common issues such as oil leaks, crankshaft wear, and premature seal failure, thereby extending the lifespan of the engine and preserving its efficiency. Whether restoring a classic GMC P35 or maintaining a well-used workhorse, this seal delivers the precision and reliability needed to keep the drivetrain operating smoothly for years to come.

**Pros and Cons of Buying an API PDL 55TRQX Front Crankshaft Seal for a GMC P35 (1975 1978)**

### **Pros:**

1. **OEM Compatibility** The API PDL 55TRQX is designed as an original equipment replacement part, meaning it should fit and function identically to the factory seal. This reduces the risk of compatibility issues with aftermarket alternatives that may not match the engine s specifications.

2. **Durability and Reliability** API parts are generally manufactured to strict quality standards, ensuring a longer lifespan compared to lower-quality or generic replacements. The 55TRQX is built for heavy-duty applications, which aligns well with the robust nature of the GM 350/400 engines used in the P35.

3. **Prevents Leaks and Contamination** A failing front crankshaft seal can lead to oil leaks into the transmission or coolant leaks into the engine, causing significant damage. Replacing it with a high-quality seal like the API PDL 55TRQX helps maintain proper lubrication and prevents costly internal engine or transmission damage.

4. **Ease of Installation** While installation requires some mechanical skill, the API seal is designed to be straightforward to fit, especially if you have the right tools (e.g., seal driver, torque wrench, and proper gasket surface preparation). Many mechanics and DIYers find it easier to work with than aftermarket alternatives that may not have the same tolerances.

5. **Warranty and Support** API is a reputable brand with customer support and warranties, which can be reassuring if the seal fails prematurely. This is particularly useful if you re unsure about the longevity of the part.

6. **Cost-Effective Long-Term Solution** While the upfront cost may be higher than some aftermarket options, the API seal s durability can save money in the long run by avoiding repeated replacements or secondary damage from a failed seal.

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### **Cons:**

1. **Higher Upfront Cost** Compared to generic or aftermarket seals, the API PDL 55TRQX is more expensive. For a classic vehicle like the GMC P35, this may be a significant investment, especially if you re on a tight budget.

2. **Potential Overkill for Mild Use** If the vehicle is primarily used for short drives or light duty, a slightly less expensive but still high-quality seal (e.g., from a trusted aftermarket brand like Fel-Pro or Sealed Power) might suffice. The 55TRQX is marketed as a heavy-duty part, which may not be necessary for every owner.

3. **Installation Challenges** Replacing a front crankshaft seal requires removing the timing cover, transmission, or accessory belt system, depending on the engine configuration. This can be labor-intensive, especially for someone without prior experience. Improper installation (e.g., not cleaning the crankshaft journal properly or overtightening bolts) can void the seal s effectiveness or damage the engine.

4. **Availability and Lead Times** While API parts are widely available, some specialty retailers or online marketplaces may have limited stock, leading to longer wait times for delivery. This could delay repairs if you re in a hurry.

5. **Risk of Counterfeit Parts** As with any high-demand OEM part, there s a risk of purchasing a counterfeit API seal. Buying from authorized dealers or reputable online retailers (e.g., RockAuto, Summit Racing, or local auto parts stores with return policies) helps mitigate this risk.

6. **Potential for Overengineering** The P35 s 350/400 engines are robust but not typically subjected to extreme conditions unless modified for heavy-duty use. For most owners, a standard OEM or high-quality aftermarket seal may be sufficient, making the 55TRQX a more expensive-than-necessary choice.

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### **Conclusion:**

The **API PDL 55TRQX front crankshaft seal** is an excellent choice for GMC P35 owners who prioritize **long-term reliability, OEM compatibility, and peace of mind**. It is particularly well-suited for vehicles that see heavy use, are modified for performance, or are kept in excellent condition for long-term preservation. The higher cost is justified by its durability and the potential savings from avoiding leaks or secondary damage.

However, if you re working with a limited budget or the vehicle is used infrequently, a **high-quality aftermarket alternative** (e.g., Fel-Pro 1200, Sealed Power 2000, or a reputable brand like Gates or Dayco) may offer a cost-effective balance without sacrificing performance. The key is ensuring the replacement seal meets or exceeds the original specifications in terms of material quality and fit.

For most P35 owners, **the API PDL 55TRQX is the safest and most reliable option**, especially if you plan to keep the vehicle running for many years. If you re unsure, consulting with a local mechanic who specializes in classic GM engines can provide additional insight tailored to your specific situation.

**Final Recommendation:** **Buy the API PDL 55TRQX if:**

- You want the best possible seal for longevity and reliability.

- Your vehicle is heavily used or modified.

- You re willing to invest in a premium part to avoid future issues.

**Consider an aftermarket alternative if:**

- You re on a tight budget and the vehicle isn t used extensively.

- You re confident in selecting a high-quality seal (e.g., Fel-Pro or Sealed Power) that meets OEM standards.

- You re comfortable with the trade-off between cost and performance.

In most cases, **the API PDL 55TRQX is the best choice** for a GMC P35, balancing quality, durability, and peace of mind. Just ensure proper installation and maintenance to maximize its lifespan.

Details:

1975-1978 GMC P35 5.7L V8. Position: Front. 1975-1978 GMC P35 4.8L 6 Cyl.

part #: 55trqx price

  • $19.76

specifications cranshafengin:

  • for makes: Gmc
  • for years: 1975-1978
  • brand: Api Pdl
  • mpn: 55trqx
  • part type: Seal Crankshaft
  • engine: 4.8l 6 Cyl, 5.7l V8
  • compatible make/model: Gmc P35
  • compatible years: 1975 1976 1977 1978 75 76 77 78
  • position: Front
  • fitment info: Pdl 1st Design; 2.416 O.d.; 0.375 Width
  • manufacturer warranty: 12 Month Warranty
  • attention: Read Full Description To Confirm Fitment
  • cs-sku: 400

seller cranshafengin:

  • city: Aurora, Colorado
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offer cranshafengin:

  • options: Ship-to-home
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  • quantity: 1
  • started: March 26, 2026
  • availability: In Stock

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general cranshafengin:

  • condition: New
  • Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
for makes: gmc, for years: 1975-1978, part type: seal crankshaft, engine: 4.8l 6 cyl, 5.7l v8, compatible make/model: gmc p35, compatible years: 1975 1976 1977 1978 75 76 77 78, position: front, fitment info: pdl 1st design; 2.416 o.d.; 0.375 width, manufacturer warranty: 12 month warranty, attention: read full description to confirm fitment, cs-sku: 400,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19497977052460773,
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  • New. Offer #1 priced at $19.76 + $0.00 shipping estimate = $19.76* total. Position: Front Notes: PDL -- 1st Design; 2.416" O.D.; 0.375" width.FREE SHIPPING

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