1. Pitman & Idler Arms Suspension Steering For Sale
  2. sku: 14915994878897772
  3. CHRYSLER 1664339

CHRYSLER 1664339 Idler Gear

fits make: Chrysler.

1664339 Chrysler Idler Gear

( Manufacturer Part Number: 1664339 ), ( Part Type: Idler Gear )

Review CHRYSLER Idler Gear

The **Chrysler 1664339 Idler Gear** is a precision-engineered transmission component designed specifically for select Chrysler, Dodge, and Jeep vehicles equipped with the legendary **41TE, 42RE, 46RE, 545RFE, and 545RFE (Aisin) automatic transmissions**. This high-quality idler gear plays a critical role in the smooth operation of the torque converter clutch and the overall shifting performance of the transmission. Crafted from durable **steel alloy**, this idler gear is heat-treated and machined to exacting tolerances to ensure longevity and reliability under high-stress conditions. Its unique design features a **precision-ground surface** and a **smooth, interference-fit bearing** that minimizes friction and wear, reducing the risk of premature failure. The idler gear operates within the transmission s **converter housing assembly**, engaging with the torque converter clutch to facilitate seamless engagement and disengagement during gear shifts, particularly in low gears and reverse. Whether installed in a classic muscle car, a rugged off-roader, or a modern performance vehicle, this idler gear is engineered to withstand the demands of aggressive driving, towing, and heavy loads. Replacing a worn or damaged idler gear is essential for maintaining optimal transmission function, preventing erratic shifting, slipping, or complete transmission failure. With its **OEM-level quality and compatibility**, the Chrysler 1664339 Idler Gear is an ideal replacement for those seeking to restore or enhance the performance of their vehicle s automatic transmission. Proper installation, using the correct tools and following manufacturer specifications, is recommended to ensure optimal fitment and longevity.

**Pros and Cons of buying a Chrysler 1664339 Idler Gear**

The Chrysler 1664339 idler gear is a critical component for vehicles equipped with automatic transmissions, particularly those using the 42LE or 46RE transmission. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **Essential for Transmission Functionality**

The idler gear plays a vital role in the transmission s planetary gear system, ensuring smooth shifting and proper engagement of gears. Without it, the transmission would fail to operate correctly, leading to drivability issues or complete breakdown.

2. **Direct OEM Replacement**

As an original equipment manufacturer (OEM) part, the Chrysler 1664339 idler gear is designed to match the specifications of the vehicle s transmission precisely. This reduces the risk of compatibility issues that can arise with aftermarket parts that may not fit or function as intended.

3. **Durability and Longevity**

Chrysler s OEM components are typically built to withstand the demands of the vehicle s intended use, provided the transmission is properly maintained. The idler gear, being a hardened metal part, is designed to last the lifespan of the transmission if it is not damaged by wear or failure in other components.

4. **Warranty Coverage**

Purchasing the part directly from Chrysler or an authorized dealer may come with warranty coverage, offering protection against defects in materials or workmanship. This can provide peace of mind, especially if the part is new or being installed as part of a warranty-covered repair.

5. **Ease of Installation**

The idler gear is relatively straightforward to replace compared to other transmission components. It is accessible without requiring major disassembly of the transmission, which can save time and labor costs during repairs.

6. **Prevents Further Damage**

If the idler gear fails, it can cause excessive wear on other transmission parts, such as synchronizers, clutches, or planetary gears. Replacing it promptly can prevent costly secondary damage and extend the life of the transmission.

---

### **Cons**

1. **Cost**

The Chrysler 1664339 idler gear is an OEM part, which typically comes with a higher price tag compared to aftermarket alternatives. While aftermarket parts may be cheaper, they might not offer the same level of quality, durability, or warranty protection.

2. **Limited Availability**

Depending on the region or the specific vehicle model, OEM parts like this idler gear may not always be readily available. This could lead to delays in obtaining the part, especially if the vehicle is older or no longer in production.

3. **Potential for Counterfeit Parts**

When purchasing OEM parts from third-party sellers (e.g., online marketplaces), there is a risk of receiving counterfeit or refurbished parts that do not meet Chrysler s quality standards. This can compromise performance and safety.

4. **Labor Costs**

While the idler gear itself is relatively easy to replace, the labor cost associated with transmission repairs can be high, especially if the transmission needs to be partially or fully disassembled to access the part. This can increase the overall cost of the repair.

5. **Misdiagnosis of Symptoms**

Transmission issues may not always be directly attributed to the idler gear. Symptoms such as rough shifting, slipping, or unusual noises could stem from other problems (e.g., low transmission fluid, worn clutches, or solenoid issues). Replacing the idler gear without addressing the root cause may lead to repeated failures.

6. **Environmental and Ethical Concerns**

Purchasing new OEM parts contributes to higher production and waste, which may not align with environmentally conscious consumers. In some cases, remanufactured or refurbished parts could be a more sustainable alternative, though they may not always be as reliable as new OEM parts.

---

### **Conclusion**

The Chrysler 1664339 idler gear is a critical and reliable component for vehicles with the 42LE or 46RE transmission. Its OEM status ensures compatibility, durability, and often warranty support, making it a strong choice for those prioritizing quality and longevity. However, the higher cost, potential for counterfeit parts, and the need for proper diagnosis of transmission issues are factors that must be considered.

If the transmission is otherwise in good condition and the failure is confirmed to be isolated to the idler gear, replacing it with the OEM part is a sound investment. For those on a tighter budget, a high-quality aftermarket part from a reputable manufacturer (e.g., ACDelco, Gates, or Mopar) may offer a cost-effective alternative, provided it meets the necessary specifications.

---

### **Recommendation**

1. **Verify the Diagnosis**

Before purchasing the idler gear, ensure that the transmission issue is indeed caused by a failing idler gear. Consult a transmission specialist or use a scan tool to check for error codes and inspect the transmission fluid for signs of contamination or low levels.

2. **Choose the Right Part**

If possible, purchase the part directly from Chrysler, an authorized dealer, or a trusted online retailer with a return policy and warranty. Avoid unknown sellers to minimize the risk of receiving counterfeit or low-quality parts.

3. **Consider Remanufactured or Aftermarket Options**

If the budget is a concern, explore remanufactured OEM parts or high-quality aftermarket alternatives from brands with strong reputations for transmission components. Ensure the part is compatible with your vehicle s transmission and has good reviews for reliability.

4. **Professional Installation**

While the idler gear replacement is relatively simple, it is best handled by a professional mechanic, especially if the transmission has been opened. Proper installation ensures the part functions correctly and avoids damaging other components.

5. **Maintain the Transmission**

After replacing the idler gear, follow the manufacturer s recommendations for transmission fluid changes and maintenance. Regular fluid changes and inspections can extend the life of the transmission and prevent future issues.

**Final Verdict:** For most drivers, the Chrysler 1664339 idler gear is the best choice due to its reliability and compatibility. However, weigh the cost against alternatives and ensure the part is necessary to avoid unnecessary expenses. If the transmission is failing due to other issues, addressing those first may be more cost-effective in the long run.

Details:

Chrysler 1664339 Idler Gear. Pictures: Thumbnails. All parts are in stock and ready to ship. Idler Gear is used and in good condition, not original packaging.

If the original package is included it may show signs of wear. Items are shipped using USPS, UPS, and FedEx.

part #: 1664339 prices

  • $38.22-$50.00

specifications pitmanidlear:

  • for makes: Chrysler
  • mpn: 1664339
  • part type: Idler Gear

general pitmanidlear:

  • Car Truck Parts Accessories > Steering Suspension > Pitman Idler Arms
  • condition: Used

seller pitmanidlear:

  • # reviews: 129878
  • rating: 99.9%
  • city: Ashaway, Rhode Island

shipping pitmanidlear:

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

offer pitmanidlear:

  • availability: In Stock
  • started: March 13, 2026
  • options: Ship-to-home
  • best offers: True
  • quantity: 2
  • sold: 0

returns pitmanidlear:

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

payments pitmanidlear:

  • credit card: Diners-club
  • other
  • wallet: Apple-pay
for makes: chrysler, part type: idler gear,
category: auto parts > car truck parts accessories > steering suspension > pitman idler arms, sku: 14915994878897772,
Chrysler 1664339 Is Similar To:
pitmanidlear logo
2 offers $38.22–$50.00 USD
  • New other (see details). Offer #1 priced at $50.00 + $0.00 shipping estimate = $50.00* total. Excellent shape, Free Shipping. NOS Mopar Idler Gear - .FREE SHIPPING
  • Used. Offer #2 priced at $38.22 + $0.00 shipping estimate = $38.22* total. Included: Idler Gear. Manufacturer Part Number: .FREE SHIPPING

Copyright © pitmanidlear.com