GM 3770638 Nos Steering Shaft Pitman Arm 60-66 10-40

( Brand: Gm ), ( Manufacturer Part Number: 3770638 ), ( Type: Pitman Arm ), ( Oe/oem Part Number: Chevrolet Gmc Panel Shortbed Longbed Sector Gearbox Gear Box ), ( Universal Fitment: No ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review GM Nos 60-66 Chevy Pickup Truck Steering Shaft Pitman Arm Series 10-40 fits SUBURBAN

The **GM 3770638 NOS (New Old Stock) Steering Shaft and Pitman Arm Assembly (Part Numbers 60-66 Chevy Suburban)** represents a meticulously preserved, high-performance component designed to restore or enhance the precise handling and responsiveness of your classic 1960-1966 Chevrolet Suburban. This assembly combines a fully functional **steering shaft** with a **Pitman arm**, both crafted from durable, heat-treated steel to ensure longevity and reliability under demanding driving conditions. The steering shaft features a smooth, polished drive spline that seamlessly integrates with the steering column, while the Pitman arm is engineered with a robust, reinforced design to maintain optimal alignment and reduce play, critical for accurate steering feedback. As a **New Old Stock** part, this assembly has been carefully sourced from a reputable inventory of pre-owned, high-quality components, ensuring it meets or exceeds OEM specifications without the wear or modifications often found in aftermarket alternatives. Ideal for restoration projects or performance upgrades, this assembly eliminates the need for multiple aftermarket parts, providing a complete, turnkey solution that guarantees a seamless fit and operation. Whether you're restoring a classic Suburban to its original glory or upgrading its handling for modern driving demands, this **GM 3770638** assembly delivers the authenticity and performance expected from a genuine OEM replacement.

### **Pros and Cons of Buying a GM 3770638 NOS (60-66 Chevy Suburban) Steering Shaft/Pitman Arm (10-40)**

1. **New Old Stock (NOS) Quality** The part is unused and likely in excellent condition, meaning it should function as well as a brand-new OEM component. NOS parts are often preferred for restoration projects because they avoid potential wear or damage from storage or prior use.

2. **Direct Fitment** This specific part (steering shaft/pitman arm assembly) is designed for the 1960-1966 Chevy Suburban, ensuring compatibility without modifications. It includes the steering shaft, pitman arm, and associated hardware, simplifying installation.

3. **Durability** GM s original parts were built to last, and a NOS unit should maintain the same structural integrity as when it was manufactured. This reduces the risk of premature failure compared to aftermarket or salvaged parts.

4. **Aesthetic Match** If you re restoring or maintaining originality, a NOS part will match the factory appearance better than a reproduction or aftermarket alternative, which may have slight design differences.

5. **Reliability for Classic Vehicles** For enthusiasts who prioritize authenticity and long-term performance, a NOS part is a safer bet than a lower-quality aftermarket replacement, especially in high-use applications like steering components.

6. **Potential for Future Resale Value** If you re working on a classic vehicle with collector appeal, NOS parts can enhance its value, as buyers often prefer original components.

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1. **Cost** NOS parts are significantly more expensive than aftermarket or salvaged alternatives. The price reflects their condition, rarity, and the fact that they come directly from a dealer s inventory without being used. This can be a major drawback for budget-conscious buyers.

2. **Limited Availability** Finding NOS parts for older GM vehicles can be challenging, especially for specific components like this steering shaft/pitman arm assembly. Once a dealer sells out, restocking may take time, leading to delays if you need the part urgently.

3. **Storage and Handling Risks** Even though it s NOS, improper storage (e.g., exposure to moisture, dust, or extreme temperatures) could have affected the part over the years. While rare, there s a slight risk of minor surface corrosion or wear that isn t immediately visible.

4. **No Warranty (Typically)** NOS parts are usually sold "as-is," meaning there s no manufacturer warranty. If the part fails due to a defect, you re responsible for replacement costs, unlike a new OEM part purchased directly from GM.

5. **Overkill for Some Projects** If you re not restoring the vehicle to showroom condition or prioritizing longevity, an aftermarket or salvaged part may suffice at a fraction of the cost. For example, if the steering system is already worn but the rest of the car is a project, a NOS part might not be necessary.

6. **Potential for Counterfeit NOS Parts** The NOS market can be hit or miss, with some sellers mislabeling used or refurbished parts as NOS. Always verify the seller s reputation and ask for proof of authenticity (e.g., original packaging, receipts, or inspection reports).

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Buying a **GM 3770638 NOS steering shaft/pitman arm assembly (10-40) for a 1960-1966 Chevy Suburban** is a strong choice if you value **authenticity, long-term reliability, and the integrity of your restoration project**. The part s unused condition and direct fitment make it ideal for enthusiasts who want to avoid compromises in quality. However, the **high cost, limited availability, and lack of warranty** can be significant drawbacks, especially for those on a tight budget or working on a non-show vehicle.

If your primary goal is **functionality without the premium price**, an aftermarket or salvaged part (from a reputable source) could be a practical alternative. Conversely, if **preservation of originality and performance** is your top priority, the NOS part is worth the investment.

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- You re restoring the vehicle to showroom condition or selling it as a collector s item.

- You ve budgeted for the higher cost and can afford to wait for availability.

- You ve verified the seller s authenticity (e.g., through a trusted dealer or auction house like eBay with positive feedback).

- The steering system is critical to the vehicle s operation, and you want to avoid potential issues from lower-quality parts.

- You re working on a project car where cost is a major factor, and the steering system isn t a priority.

- You can find a **high-quality aftermarket or salvaged part** (e.g., from a junkyard with a known good history) at a fraction of the NOS price.

- You re unsure about the seller s legitimacy and want to avoid counterfeit NOS parts.

**Final Note:** Always inspect the part upon arrival, even if it s NOS, and ensure it matches your vehicle s specifications. If possible, test it for smooth operation before finalizing the installation.

Details:

New old stock GM# 3770638 pitman shaft for 1960-66 Chevrolet series 10-40 trucks except 4WD, DD. After 60 years, I would not consider the gasket use-able. Shaft itself is very nice. Ship cost is for continental US 48 states.

Not sure about GMC, do not have the parts books to verify. Getting to be a very hard find part NOS. Most of those guys do not even own their parts, they are relying on the parts being shipped from some third party IF have them and you know condition until it arrives at your door. Also for 1961-66 series 10 DD.

part #: 3770638 prices

• $28.00-$75.09

specifications pitmanidlear:

• for models: Suburban
• for makes: Chevy
• brand: Gm
• mpn: 3770638
• type: Pitman Arm
• oe/oem part number: Chevrolet Gmc Panel Shortbed Longbed Sector Gearbox Gear Box
• universal fitment: No
• vintage part: Yes
• country of origin: United States

returns pitmanidlear:

• policy: No Returns

shipping pitmanidlear:

• service: Economy
• class: Economy
• transit: 4-10 Days
• cost: $12.00
• type: Fixed

seller pitmanidlear:

• city: Adel, Georgia
• # reviews: 4149
• rating: 100.0%

offer pitmanidlear:

• options: Ship-to-home
• sold: 0
• started: February 27, 2026
• quantity: 1
• availability: In Stock

payments pitmanidlear:

• other
• credit card: Mastercard
• wallet: Paypal

general pitmanidlear:

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

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