1. Automatic Transmissions Products
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  3. JEGS 60307

JEGS 60307 Gm Performance Automatic Transmission 889944256557 TH350

fits model: 4wd. make: Chevrolet.

60307 Jegs Gm Th350 Performance Automatic Transmission For Chevrolet 4wd

( Brand: Jegs ), ( Manufacturer Part Number: 60307 ), ( Part Type: Transmission ), ( Country Of Origin: Usa ), ( UPC: 889944256557 )

Review JEGS Gm Th350 Performance Automatic Transmission Chevrolet fits 4WD

The **GM 60307 GM TH350 Performance Automatic Transmission** is a high-performance, heavy-duty transmission designed specifically for Chevrolet 4WD applications, including trucks, SUVs, and off-road vehicles built between the late 1980s and early 2000s. This transmission is a direct replacement for the stock TH350, engineered to deliver superior durability, smoother shifting, and enhanced torque handling under demanding conditions making it an ideal choice for enthusiasts seeking improved performance, reliability, and longevity in their 4WD rigs. Built with a robust **cast aluminum housing** and reinforced internal components, the 60307 is constructed to withstand the rigors of towing, hauling, and aggressive off-roading while maintaining precise gear engagement and reduced wear over time. Unlike standard OEM transmissions, this upgraded unit features **high-quality internal bearings, seals, and synchronizers**, reducing friction and preventing premature failure, even under extreme loads or prolonged use in harsh environments.

One of the standout features of this transmission is its **optimized valve body and torque converter pairing**, which ensures quicker, more responsive shifts and better throttle response, particularly in high-torque applications. The **performance clutch packs and band assemblies** are upgraded to handle higher horsepower and torque outputs, making this transmission a popular choice for modified engines or turbocharged setups without sacrificing reliability. Additionally, the **reinforced output shaft and input yoke** provide increased strength, reducing the risk of bending or fatigue under heavy loads, while the **upgraded planetary gears** improve efficiency and reduce noise during operation. Whether installed in a classic **Chevy Silverado, GMC Sierra, or older-generation Tahoe**, this transmission delivers a noticeable improvement in shift quality, fuel efficiency, and overall drivetrain performance compared to the stock unit.

For off-road and overlanding applications, the 60307 stands out due to its **durable construction and ability to handle extreme angles and rough terrain** without compromising functionality. The **sealed internal components** protect against dust, debris, and moisture, ensuring long-term reliability even in the most challenging conditions. When paired with a **performance torque converter** (such as a **6300-series or 6500-series unit**), this transmission can further enhance acceleration and towing capacity, making it a versatile upgrade for both daily drivers and extreme off-road vehicles. Installation is straightforward, as it is a **drop-in replacement** for the stock TH350, requiring only basic tools and a few hours of labor, though proper fluid selection (such as **Mopar ATF 4 or Dexron VI**) is critical to maintaining optimal performance and longevity. Whether you're looking to restore an older vehicle, boost performance in a modified engine setup, or simply future-proof your drivetrain, the **GM 60307 TH350 Performance Automatic Transmission** is a proven, high-quality upgrade that delivers real-world benefits for Chevrolet 4WD owners.

### **Pros and Cons of Buying a 60307 GM TH350 Performance Automatic Transmission for a Chevrolet 4WD**

#### **Pros:**

1. **Proven Reliability** The TH350 is a well-established transmission, widely used in Chevrolet trucks and SUVs from the 1990s through the early 2000s. Its durability and availability of parts make it a solid choice for restoration or replacement projects.

2. **Performance-Oriented Design** The "Performance" variant of the TH350 is tuned for better shift quality and torque handling compared to the standard version. It features a stronger torque converter and improved valve body calibration, making it suitable for towing or heavy-duty applications.

3. **Compatibility with 4WD Systems** Since it is designed for Chevrolet s 4WD vehicles (such as the Silverado, Tahoe, or Suburban), it integrates seamlessly with the drivetrain, including the transfer case and axle ratios.

4. **Cost-Effective Replacement** Compared to newer transmissions, the TH350 is relatively affordable to purchase, rebuild, or repair. This makes it a budget-friendly option for those working on older GM trucks.

5. **Aftermarket Support** A large aftermarket exists for the TH350, including rebuild kits, performance mods (such as stronger clutch packs or upgraded solenoids), and custom tuning options for better shift feel and durability.

6. **Ease of Installation** The transmission is straightforward to install, especially in vehicles with similar mounts and bellhousing patterns. Many mechanics and DIYers are familiar with its installation process.

7. **Towing Capability** With proper modifications (such as a heavier-duty torque converter or upgraded fluid), the TH350 can handle moderate towing loads, making it a viable option for trucks used for hauling trailers or equipment.

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#### **Cons:**

1. **Age and Wear** As a transmission from the late 1990s to early 2000s, the TH350 may suffer from common issues like worn seals, leaking gaskets, or failing solenoids, especially if the original unit is being reused. A rebuild is often necessary for long-term reliability.

2. **Limited Torque Capacity** While the "Performance" version is stronger than the standard TH350, it is not designed for extreme torque loads (e.g., heavy-duty diesel applications or severe towing). Exceeding its limits can lead to premature failure.

3. **Electronic Control Dependence** The TH350 relies on a PCM (Powertrain Control Module) for shift control. If the vehicle s computer is outdated or incompatible, programming issues may arise, requiring a compatible ECU or a manual shift kit.

4. **Fluid and Filter Requirements** The transmission requires high-quality automatic transmission fluid (ATF), such as Dexron III or Mercon, and regular fluid changes to prevent sludge buildup and extend its lifespan. Neglecting this can lead to costly repairs.

5. **Availability of Parts** While parts are still available, some components (such as rare solenoids or gaskets) may become harder to find over time, increasing repair costs if the transmission fails.

6. **Shift Quality Issues** Without proper tuning or a rebuild, the TH350 may exhibit harsh or delayed shifts, especially under load. This can be addressed with aftermarket mods but adds to the overall cost.

7. **Compatibility with Modern Vehicles** If installed in a newer vehicle (or one with updated wiring), electrical compatibility issues (such as solenoid activation or shift solenoids) may require additional modifications or a custom harness.

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### **Conclusion:**

The **60307 GM TH350 Performance Automatic Transmission** is a solid choice for Chevrolet 4WD vehicles if you prioritize reliability, performance, and cost-effectiveness. It excels in applications where moderate torque and towing are required, and its aftermarket support makes it a practical option for restorations or upgrades. However, it is not ideal for extreme duty applications, and proper maintenance (fluid changes, rebuilds, and mods) is essential to prevent premature failure.

For **light-duty towing, daily driving, or classic truck projects**, the TH350 is a **strong recommendation** with the right preparation. For **heavy-duty or high-torque applications**, consider a more robust transmission (such as a 4L60E or 4L85) to avoid stressing the unit beyond its limits.

### **Final Recommendation:**

- **Buy it if:** You need a reliable, performance-tuned transmission for a Chevrolet 4WD, are prepared for potential rebuilds, and plan to use it in moderate towing or daily driving.

- **Avoid it if:** You require extreme torque handling, have limited mechanical experience with transmissions, or are working with a vehicle that lacks proper electrical compatibility.

- **Best Practices:**

- Rebuild the transmission before installation if it s a used unit.

- Use high-quality ATF and follow a strict maintenance schedule.

- Consider aftermarket upgrades (such as a stronger torque converter or performance valve body) if modifying the truck for towing or performance.

- Ensure the vehicle s PCM is compatible or plan for a manual shift conversion if electronic issues arise.

Details:

part #: 60307 price

  • $2100.99

specifications autotransmissionsgo:

  • for models: 4wd
  • for makes: Chevrolet
  • brand: Jegs
  • mpn: 60307
  • part type: Transmission
  • country of origin: Usa
  • upc: 889944256557

returns autotransmissionsgo:

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

shipping autotransmissionsgo:

  • type: Fixed
  • class: Standard
  • transit: 5-8 Days
  • service: Standard
  • cost: $0.00

general autotransmissionsgo:

  • condition: New
  • Car Truck Parts Accessories > Transmission Drivetrain > Automatic Transmission

seller autotransmissionsgo:

  • # reviews: 629945
  • rating: 99.5%
  • city: , Ohio

offer autotransmissionsgo:

  • quantity: 8
  • started: May 15, 2026
  • options: Ship-to-home
  • sold: 0
  • availability: In Stock

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  • wallet: Apple-pay
for models: 4wd, for makes: chevrolet, part type: transmission, country of origin: usa,
category: auto parts > car truck parts accessories > transmission drivetrain > automatic transmission, sku: 23835763362603813,
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1 offer $2100.99 USD
  • New. Offer #1 priced at $2100.99 + $0.00 shipping estimate = $2100.99* total. Performance Automatic Transmission, GM TH350, Chevy Bellhousing Bolt Pattern, Fits 4WD Applications, Fits Pre-1980 NP203 and NP205 transfer case, Case Fill, Dyno Tested JEGS GM TH350 Performance Automatic Transmission for Chevrolet 4WD.FREE SHIPPING

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