1. Engine Crankshafts Products
  2. sku: 19908256229258793
  3. AC DELCO 39574PPTB

AC DELCO 39574PPTB Crankshaft Bearing

fits model: Blazer. make: Chevrolet. year: 1987–1995.

39574pptb Ac Delco For 1987-1995 Chevrolet Blazer Crankshaft Main Bearing 1988

( Brand: Ac Delco ), ( Manufacturer Part Number: 39574PPTB ), ( Part Type: Bearing Crankshaft ), ( Manufacturer Warranty: 12 Month Warranty ), ( Notes: Engine Crankshaft Main Bearing New; Standard ), ( Years: 1987 1988 1989 1990 1991 1992 1993 1994 1995 ), ( Application: Chevrolet Blazer Crankshaft Main Bearing ), ( Product Name 2: Engine Crankshaft Main Bearing ), ( Cs-sku: 400 )

Review AC DELCO Chevrolet Crankshaft Main Bearing fits BLAZER 1987–1995

The **AC Delco 39574PPTB** is a high-performance, precision-engineered crankshaft bearing designed specifically for the **1987 1995 Chevrolet Blazer** equipped with the **3.1L (191 cu. in.) V6 engine**, particularly the **1988 model year variant**. This aftermarket bearing is meticulously crafted to meet or exceed OEM specifications, ensuring optimal performance, durability, and reliability under demanding driving conditions. Engineered from high-quality, heat-resistant materials, this bearing is designed to withstand the stresses of high RPMs, heavy loads, and extended engine operation, making it an ideal upgrade for enthusiasts seeking improved engine longevity and smoother operation. The **39574PPTB** fits seamlessly into the crankshaft s main bearing journals, providing a tight, low-friction interface that minimizes wear while maximizing power transfer. Whether you're restoring a classic Blazer, optimizing engine performance, or addressing signs of wear in an aging engine, this bearing offers a cost-effective solution that enhances overall drivability and reduces the risk of catastrophic failure. Built to withstand the rigors of daily driving, off-road adventures, or high-performance applications, this component is a trusted choice for mechanics and DIYers alike who demand precision and dependability in their automotive repairs.

### **Pros and Cons of buying a AC Delco 39574PPTB Crankshaft Bearing for a 1988 Chevrolet Blazer**

#### **Pros:**

1. **Direct Fitment** The **AC Delco 39574PPTB** is a **direct replacement** for the crankshaft bearings in **1987 1995 Chevrolet Blazers** with the **305, 350, or 400 V8 engines**, including the **1988 model year**. This means no modifications or additional parts are required for installation.

2. **High-Quality Material** AC Delco is a **reputable brand** under General Motors, known for producing **durable, high-performance bearings** that meet or exceed OEM specifications. The **PPTB (Plated Plumbum-Tin Bearing)** variant is designed for **high-stress applications**, reducing wear and extending engine life.

3. **Widely Available** This part is **easily found** at most **auto parts stores** (AutoZone, O Reilly, RockAuto, etc.), online marketplaces (Amazon, eBay, RockAuto), and through **GM dealers**. Availability reduces the risk of delays in repairs.

4. **Cost-Effective Solution** While not the **cheapest** bearing on the market, it strikes a balance between **affordability and reliability**. Replacing worn bearings prevents **costlier engine damage** (such as rod bearing failure or crankshaft damage) that could require a **full engine rebuild**.

5. **Compatibility with Common Engine Issues** The **1988 Blazer s V8 engines** (especially the **350 V8**) are prone to **bearing wear** due to **high mileage, poor maintenance, or aggressive driving**. Replacing these bearings can **restore smooth operation** and prevent catastrophic failure.

6. **Warranty & Return Options** Many retailers offer **warranties** (typically 1 2 years) and **return policies**, providing peace of mind if the bearings fail prematurely.

7. **Professional Installation Support** Since this is an **OEM-style part**, most **mechanics and repair shops** are familiar with its installation, reducing the risk of improper fitting.

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#### **Cons:**

1. **Price Higher Than Aftermarket Alternatives** While not excessively expensive, **AC Delco bearings cost more** than some **aftermarket brands** (e.g., **Fel-Pro, Moroso, or Clevite**). For budget-conscious buyers, cheaper options may be tempting, though they may lack the same durability.

2. **Installation Requires Engine Disassembly** Replacing crankshaft bearings is a **labor-intensive job** that involves:

- Removing the **engine from the vehicle** (or at least the **crankshaft assembly**).

- Disassembling the **oil pump, timing components, and connecting rods**.

- Precision cleaning and **re-gapping** (if applicable).

- This is **not a DIY job for beginners** most owners will need a **mechanic**, increasing labor costs.

3. **Potential for Counterfeit Parts** When purchasing online (especially from third-party sellers), there is a **risk of counterfeit or reused bearings**. Buying from **authorized dealers or reputable retailers** (RockAuto, Amazon, or a trusted local shop) minimizes this risk.

4. **Limited Lifespan if Engine Conditions Are Poor** If the **oil is old, contaminated, or the engine has other internal issues** (e.g., oil leaks, poor sealing), even **high-quality bearings** may wear out faster. A **full engine service** (oil change, filter replacement, seal inspection) should be done **before and after** installation.

5. **No Guarantee Against Future Issues** While these bearings are **durable**, they are not **lifetime components**. If the **engine was previously abused** (e.g., low oil, overheating, lack of maintenance), the **remaining components (rod bearings, camshaft bearings, seals)** may still fail over time.

6. **Environmental & Disposal Concerns** Bearings contain **lead and other metals**, making disposal **environmentally sensitive**. Buyers should ensure proper disposal through **auto recycling centers**.

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### **Conclusion & Recommendation**

The **AC Delco 39574PPTB crankshaft bearing** is a **strong, reliable choice** for restoring the health of a **1988 Chevrolet Blazer s V8 engine**, particularly if the vehicle has **high mileage, rough operation, or signs of bearing wear**. Its **direct fitment, high-quality construction, and GM-backed reputation** make it a **safe and practical option** for owners who prioritize **longevity and performance**.

However, the **high installation cost (labor-intensive job)** and **potential for counterfeit parts** (when buying online) are **valid concerns**. If budget is a major factor, **aftermarket brands like Fel-Pro or Moroso** (which are also high-quality) may offer a **slightly cheaper alternative** without sacrificing too much durability.

#### **Final Recommendation:**

- **If the engine is showing symptoms of crankshaft bearing failure** (knocking, oil consumption, rough idle), **replace the bearings ASAP** to prevent **catastrophic engine damage**.

- **Buy from a trusted source** (RockAuto, Amazon, or a local GM parts dealer) to avoid counterfeit parts.

- **Have a mechanic perform the installation** this is **not a beginner-friendly repair**.

- **Consider a full engine service** (oil change, filter, seals) **before and after** the bearing replacement for maximum effectiveness.

- **If the engine has other known issues** (e.g., rod bearing wear, oil leaks), **address those first** to ensure the new bearings last as long as possible.

**Verdict:** **Worth the investment** if the engine s health is critical. For **minor maintenance or low-mileage vehicles**, a **preventative bearing replacement** may not be immediately necessary, but it is a **wise long-term upgrade** for reliability.

Details:

GM regularly updates production and service part designs to integrate new materials technologies. Parts Geek - For 1987 - 1995 Chevrolet Blazer Crankshaft Main Bearing AC Delco 39574PPTB 1988: Review Fitment Notes to Ensure Proper Fit condition: New Brand: Notes: Engine New; STANDARD Meets or Exceeds OEM Specifications: Yes Features: GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, Cadillac vehicle. Some GM Genuine Parts may have formerly appeared as AcDelco Original Equipment OE. Notes:BEARING KIT, CRANKSHAFT #1,2,3,4 STANDARD.

Fitment Notes: UPPER AND LOWER #1,2,3, Vehicle: 1995 Chevrolet Blazer.

part #: 39574pptb price

  • $44.33

specifications cranshafengin:

  • for models: Blazer
  • for makes: Chevrolet
  • for years: 1987-1995
  • brand: Ac Delco
  • mpn: 39574pptb
  • part type: Bearing Crankshaft
  • manufacturer warranty: 12 Month Warranty
  • notes: Engine Crankshaft Main Bearing New; Standard
  • years: 1987 1988 1989 1990 1991 1992 1993 1994 1995
  • application: Chevrolet Blazer Crankshaft Main Bearing
  • product name 2: Engine Crankshaft Main Bearing
  • cs-sku: 400

payments cranshafengin:

  • wallet: Apple-pay
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seller cranshafengin:

  • rating: 98.8%
  • # reviews: 328846
  • city: Azusa, California

general cranshafengin:

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

offer cranshafengin:

  • started: April 18, 2026
  • availability: In Stock
  • options: Ship-to-home
  • sold: 0
  • quantity: 1

returns cranshafengin:

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

shipping cranshafengin:

  • transit: 4-9 Days
  • carrier: FedEx
  • class: Standard
  • type: Fixed
  • cost: $0.00
  • service: FedEx Ground / FedEx Home Delivery
for models: blazer, for makes: chevrolet, for years: 1987-1995, part type: bearing crankshaft, manufacturer warranty: 12 month warranty, notes: engine crankshaft main bearing new; standard, years: 1987 1988 1989 1990 1991 1992 1993 1994 1995, application: chevrolet blazer crankshaft main bearing, product name 2: engine crankshaft main bearing, cs-sku: 400,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 19908256229258793,
Ac Delco 39574PPTB Is Similar To:
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1 offer $44.33 USD
  • New. Offer #1 priced at $44.33 + $0.00 shipping estimate = $44.33* total. Notes:BEARING KIT, CRANKSHAFT #1,2,3,4 (STANDARD) Notes: Engine Crankshaft Main Bearing -- New; STANDARD.FREE SHIPPING

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