1. Pitman & Idler Arms Suspension Steering For Sale
  2. sku: 15401782304788603
  3. AC DELCO 16645GZTS

AC DELCO 16645GZTS Idler Arm

fits model: 1500, Sierra. make: Gmc. year: 1999–2006.

16645gzts Ac Delco For 1999-2003 2005-2006 Gmc Sierra 1500 Idler Arm 2000 2001

( Brand: Ac Delco ), ( Manufacturer Part Number: 16645GZTS ), ( Part Type: Idler Arm ), ( Manufacturer Warranty: 12 Month Warranty ), ( Years: 1999 2000 2001 2002 2003 2005 2006 ), ( Application: Gmc Sierra 1500 Idler Arm ), ( Cs-sku: 400 )

Review AC DELCO Gmc Idler Arm fits SIERRA 1500 1999–2006

The **AC Delco 16645GZTS** is a high-performance, precision-engineered **idler arm assembly** designed specifically for the **1999-2003, 2005-2006 GMC Sierra 1500** (and compatible with select **2000-2001 Chevrolet Silverado 1500** models), ensuring optimal tension and smooth operation of the serpentine belt system. Crafted from durable **zinc-plated steel** and reinforced with a **high-strength polymer bushing**, this idler arm is built to withstand the demanding stresses of heavy-duty applications, including towing, hauling, and extended highway driving. The **precision-machined mounting bracket** features a **threaded stud** for secure installation, while the **integrated spring mechanism** provides consistent tension, reducing belt slippage and preventing premature wear on the alternator, power steering pump, and air conditioning compressor. Engineered to meet or exceed **OEM specifications**, this aftermarket replacement eliminates the need for costly diagnostic trips or premature belt and pulley failures, offering a reliable alternative to original equipment parts. Whether replacing a worn-out component or upgrading for enhanced durability, the **AC Delco 16645GZTS** delivers the performance and longevity expected from a trusted brand, ensuring your GMC Sierra s drivetrain operates with efficiency and reliability under even the most demanding conditions.

### Pros and Cons of buying a AC Delco 16645GZTS Idler Arm for 1999-2003, 2005-2006 GMC Sierra 1500 (2000-2001 Models)

#### **Pros:**

1. **OEM Quality and Fitment** The AC Delco 16645GZTS is an original equipment manufacturer (OEM) part, meaning it is designed to match the specifications of the factory component. This ensures proper fitment, reducing the risk of installation issues or misalignment.

2. **Reliability and Durability** AC Delco is a trusted brand under General Motors, known for producing parts that meet or exceed OEM standards. The idler arm is built to withstand the stresses of daily driving, reducing the likelihood of premature failure.

3. **Compatibility with Multiple Years** This part is designed to fit a range of GMC Sierra 1500 models (1999-2003, 2005-2006, as well as 2000-2001), making it a versatile choice if you re unsure about the exact year or if you plan to use it in multiple vehicles.

4. **Ease of Installation** Since it is an OEM replacement, the idler arm should install similarly to the original, with straightforward mounting and adjustment procedures. Most mechanics and DIYers can replace it without specialized tools.

5. **Warranty Coverage** AC Delco parts often come with manufacturer warranties, providing peace of mind in case of defects or early failure. This can be particularly valuable if you re unsure about the quality of aftermarket alternatives.

6. **Cost-Effective Alternative to OEM** While not a true OEM part (as it is a remanufactured or aftermarket version), it is significantly cheaper than purchasing a brand-new OEM idler arm directly from GM, offering a balance between quality and affordability.

7. **Reduces Tensioner Wear** A failing idler arm can cause excessive wear on the tensioner pulley and serpentine belt, leading to costly replacements. Replacing it proactively can extend the life of other suspension components.

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#### **Cons:**

1. **Potential for Counterfeit or Low-Quality Units** The aftermarket is rife with counterfeit or substandard parts, especially for popular items like this idler arm. Purchasing from an untrusted seller (e.g., unverified online marketplaces or discount stores) could result in a poorly made or incorrectly labeled part.

2. **Higher Price Than Basic Aftermarket Parts** While cheaper than OEM, the AC Delco 16645GZTS is still more expensive than generic aftermarket alternatives. If you re on a tight budget, you may find equally effective (though potentially lower-quality) options elsewhere.

3. **Mixed Reviews on Longevity** Some users report that while the AC Delco part is decent, it may not last as long as a true OEM or high-end aftermarket part (e.g., Gates or Dayco). If the original idler arm failed due to wear, the replacement might not solve the underlying issue (e.g., belt tensioner misalignment or suspension stress).

4. **Limited Availability of Original Packaging** If you purchase from a secondary market (e.g., eBay, Facebook Marketplace), the part may not come with original packaging, instructions, or warranty documentation. This could complicate installation or warranty claims.

5. **Risk of Incorrect Part Number** The part number 16645GZTS may not match your exact vehicle configuration (e.g., engine type, suspension setup, or year-specific modifications). Double-checking compatibility is essential to avoid purchasing the wrong part.

6. **Installation Challenges** If the vehicle has been modified (e.g., lifted suspension, aftermarket pulleys, or misaligned components), the idler arm may not fit or function as intended. Proper alignment and adjustment are critical after replacement.

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### **Conclusion:**

The AC Delco 16645GZTS idler arm is a **solid choice** for replacing a worn or failed idler arm in your GMC Sierra 1500, especially if you prioritize OEM-like quality and reliability. It strikes a balance between cost and performance, making it suitable for both DIY enthusiasts and professional mechanics. However, it is not without drawbacks, particularly if purchased from an unreliable source or if the vehicle has unique modifications.

**To maximize satisfaction:**

- **Buy from a reputable seller** (e.g., RockAuto, PartsGeek, or a trusted local auto parts store) to avoid counterfeit parts.

- **Verify compatibility** with your exact vehicle year, engine, and suspension setup before purchasing.

- **Inspect the part upon arrival** for damage, wear, or incorrect labeling.

- **Follow manufacturer guidelines** for installation, including proper belt tension and pulley alignment.

If you re working on a tight budget and can t verify the part s authenticity, consider a **high-quality aftermarket alternative** (e.g., Gates or Dayco) with strong reviews, though these may not always be as universally compatible. For long-term reliability, a **true OEM part** (if available) or a **well-reviewed premium aftermarket option** could be worth the extra cost.

### **Final Recommendation:** **Purchase the AC Delco 16645GZTS if:**

- You value OEM-like quality and fitment.

- You re buying from a trusted source with a return policy.

- You re comfortable with basic suspension maintenance.

**Avoid or consider alternatives if:**

- You suspect the part may be counterfeit or low-quality.

- Your vehicle has significant modifications that could affect fitment.

- You re open to exploring other brands with strong warranties and reviews.

For most users, this part will serve its purpose effectively, but always prioritize quality and compatibility to avoid future issues.

Details:

Parts Geek - For 1999 - 2003, 2005 - 2006 GMC Sierra 1500 Idler Arm AC Delco 16645GZTS 2000 2001: Review Fitment Notes to Ensure Proper Fit condition: New Brand: Notes: 12 Month Warranty OEM Vehicle: Sub model: 2002 - 2003 1500Base, 1500WT, 2002 1500HT, 2001 - 2003 1500SLE, 1500SLT, 1500SL, 1999 - 2000.

part #: 16645gzts price

  • $77.46

specifications pitmanidlear:

  • for models: 1500, Sierra
  • for makes: Gmc
  • for years: 1999-2006
  • brand: Ac Delco
  • mpn: 16645gzts
  • part type: Idler Arm
  • manufacturer warranty: 12 Month Warranty
  • years: 1999 2000 2001 2002 2003 2005 2006
  • application: Gmc Sierra 1500 Idler Arm
  • cs-sku: 400

seller pitmanidlear:

  • city: Austin, Texas
  • # reviews: 328783
  • rating: 98.8%

payments pitmanidlear:

  • credit card: Diners-club
  • wallet: Paypal
  • other

offer pitmanidlear:

  • quantity: 1
  • availability: In Stock
  • sold: 0
  • options: Ship-to-home
  • started: April 17, 2026

shipping pitmanidlear:

  • carrier: FedEx
  • type: Fixed
  • cost: $0.00
  • service: FedEx Ground / FedEx Home Delivery
  • transit: 4-8 Days
  • class: Standard

general pitmanidlear:

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

returns pitmanidlear:

  • time: 30 Days
  • policy: Returns Accepted
  • paid by: Seller
for models: 1500, sierra, for makes: gmc, for years: 1999-2006, part type: idler arm, manufacturer warranty: 12 month warranty, years: 1999 2000 2001 2002 2003 2005 2006, application: gmc sierra 1500 idler arm, cs-sku: 400,
category: auto parts > car truck parts accessories > steering suspension > pitman idler arms, sku: 15401782304788603,
Ac Delco 16645GZTS Is Similar To:
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2 offers $77.46–$77.46 USD
  • New. Offer #1 priced at $77.46 + $0.00 shipping estimate = $77.46* total. 1999-2000, 2005-2006 GMC Sierra 1500. Notes: Idler Arm.FREE SHIPPING
  • New. Offer #2 priced at $77.46 + $0.00 shipping estimate = $77.46* total. FREE SHIPPING

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