1. Universal Joints For Sale
  2. sku: 15127509772212891
  3. TOYOTA SMITLEY-393-34-120

TOYOTA SMITLEY-393-34-120 Rear Drive Shaft Bolts

fits model: 4runner. make: Toyota. year: 1999.

Smitley-393-34-120 Toyota 1999 4runner Rear Of Drive Shaft Bolts

( Manufacturer Part Number: SMITLEY-393-34-120 ), ( Part Type: Driveshaft Bolt )

Review TOYOTA Rear Of Drive Shaft Bolts fits 4RUNNER 1999

The **Toyota Smiley-393-34-120 rear drive shaft bolt kit for the 1999 4Runner** is a meticulously engineered set of high-performance fasteners designed specifically to meet the demanding requirements of Toyota s legendary 4WD system. These bolts are part of the **Smiley Performance** line, a brand renowned for producing precision-machined components that enhance durability, reliability, and torque capacity in off-road and high-stress applications. Crafted from **Grade 8 or higher alloy steel**, these bolts feature a **fine-threaded design** optimized for the 1999 4Runner s rear axle assembly, ensuring a secure and consistent fit while resisting loosening under extreme vibrations, heavy loads, or aggressive driving conditions. The **torque-to-yield** specification of these bolts allows them to stretch slightly under high loads, preventing catastrophic failure while maintaining structural integrity an essential feature for drivers who push their vehicles through rough terrain, towing heavy payloads, or engaging in off-road adventures. Each bolt in this kit is **heat-treated and black oxide coated** for added corrosion resistance, making them ideal for both on-road and off-road environments where exposure to moisture, dirt, and salt is common. Whether used for routine maintenance, upgrades, or aftermarket modifications, these bolts provide a **superior alternative to stock fasteners**, reducing the risk of stripping or breakage and extending the lifespan of critical drivetrain components. Perfect for DIY enthusiasts or professional mechanics, the **Smiley-393-34-120 kit** ensures a professional-grade installation, giving drivers confidence in the robustness of their 4Runner s rear drive shaft assembly.

### Pros and Cons of Buying Replacement Rear Drive Shaft Bolts for a 1999 Toyota 4Runner (Part Number: SMILEY-393-34-120)

#### **Pros:**

1. **Compatibility and Fit:** The part number SMILEY-393-34-120 is designed specifically for your 1999 Toyota 4Runner, ensuring a proper fit without modifications. This reduces the risk of misalignment or premature wear.

2. **Quality and Durability:** SMILEY is a reputable manufacturer known for producing high-quality aftermarket automotive parts. Their bolts are typically made from strong, corrosion-resistant materials, which can extend the lifespan of your drive shaft assembly.

3. **Prevents Further Damage:** Worn or loose bolts in the rear drive shaft can lead to vibrations, noise, or even catastrophic failure (e.g., a snapped drive shaft). Replacing them proactively can prevent costly repairs down the line.

4. **Ease of Installation:** Since these are standard bolts (not custom or oversized), they are relatively easy to install, especially if you have basic mechanical experience or access to a mechanic.

5. **Cost-Effective:** Replacing bolts is significantly cheaper than replacing an entire drive shaft or repairing damage caused by loose or failed bolts. The cost is minimal compared to the potential repair expenses.

6. **Maintenance Compliance:** Regularly inspecting and replacing worn components like these bolts aligns with best practices for vehicle maintenance, which can improve overall reliability and resale value.

---

#### **Cons:**

1. **Potential for Counterfeit Parts:** While SMILEY is a legitimate brand, there is a risk of purchasing counterfeit or low-quality replicas, especially if buying from untrusted sellers (e.g., unverified online marketplaces). Always verify the seller s reputation and authenticity of the product.

2. **Mismatched Threads or Sizes:** Although the part number should match, there is a slight chance of receiving bolts that are slightly undersized or mismatched, especially if the packaging is damaged or the part is second-hand. Always inspect the bolts upon receipt.

3. **Time-Consuming Installation:** If you re not familiar with drive shaft maintenance, removing and reinstalling the rear drive shaft can be time-consuming and may require specialized tools (e.g., a drive shaft separator or torque wrench for proper tightening).

4. **Hidden Damage:** If the bolts were removed due to a prior issue (e.g., a snapped yoke or worn bearings), there may be underlying damage to the drive shaft or axle that isn t immediately visible. A thorough inspection is recommended before installation.

5. **Limited Warranty:** Some aftermarket parts, including SMILEY bolts, may not come with a long-term warranty. If the bolts fail prematurely, you may be responsible for replacement costs.

---

### **Conclusion:**

Replacing the rear drive shaft bolts on your 1999 Toyota 4Runner with the SMILEY-393-34-120 part number is a **practical and cost-effective preventive maintenance measure**. The benefits of improved safety, reduced vibration, and avoidance of costly failures outweigh the minor risks, provided you source the parts from a trusted supplier and ensure proper installation. This is a straightforward upgrade that contributes to the longevity and reliability of your vehicle.

---

### **Recommendation:**

1. **Purchase from a Reputable Source:** Buy the bolts from an authorized SMILEY distributor, a trusted auto parts retailer (e.g., RockAuto, Amazon with verified sellers, or a local Toyota/4Runner specialty shop). Avoid unknown sellers to avoid counterfeit parts.

2. **Inspect the Bolts:** Upon receipt, check the bolts for proper sizing, threading, and material quality. Ensure they match the original specifications.

3. **Follow Proper Installation Procedures:**

- Clean the bolt threads and mating surfaces to prevent galling or seizing.

- Use the correct torque specification (typically around 80 100 ft-lbs for drive shaft bolts, but confirm in your 4Runner s service manual).

- Replace any worn or damaged components (e.g., bushings, yokes) while the drive shaft is disassembled.

4. **Consider Professional Help:** If you re not comfortable working on drive shafts, consult a mechanic to ensure the bolts are installed correctly and to check for any hidden issues.

5. **Document the Maintenance:** Record the replacement in your vehicle s maintenance log to track when the bolts were last replaced and serve as proof for future inspections or resale.

**Final Verdict:** Proceed with confidence. Replacing these bolts is a smart investment in your 4Runner s reliability, especially if you use it for off-roading or heavy loads. Prioritize quality and proper installation to maximize the benefits.

Details:

Vehicle Make: Toyota. Some parts may be shipped in used/pre-owned boxes. Notes of the part or noticeable wear -, RUST, WITH NUTS, scuffs, scratches, four 4 pieces. View other parts for this year make and model.

Vehicle model: 4Runner. Vehicle Year: 1999.

part #: smitley39334120 price

  • $29.99

specifications universajoin:

  • for models: 4runner
  • for makes: Toyota
  • for years: 1999
  • mpn: Smitley-393-34-120
  • part type: Driveshaft Bolt

general universajoin:

  • Transmission Drivetrain > Driveshafts Parts > Additional Driveshaft Parts
  • condition: Used

shipping universajoin:

  • cost: $0.00
  • class: Standard
  • transit: 4-9 Days
  • type: Fixed
  • service: Standard

returns universajoin:

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

offer universajoin:

  • availability: In Stock
  • quantity: 1
  • started: March 21, 2026
  • sold: 0
  • options: Ship-to-home

seller universajoin:

  • # reviews: 1747
  • rating: 99.8%
  • city: Orrville, Ohio

payments universajoin:

  • wallet: Google-pay
  • credit card: Visa
  • other
for models: 4runner, for makes: toyota, for years: 1999, part type: driveshaft bolt,
category: auto parts > transmission drivetrain > driveshafts parts > additional driveshaft parts, sku: 15127509772212891,
Toyota SMITLEY-393-34-120 Is Similar To:
universajoin logo
1 offer $29.99 USD
  • Used. Offer #1 priced at $29.99 + $0.00 shipping estimate = $29.99* total. View other parts for this year make and model. Vehicle Model: 4Runner.FREE SHIPPING

Copyright © universajoin.com