CARLSON CMC-7 Idler Arm Packard Round Nos Auto Kit Cmc

( Brand: Carlson ), ( Manufacturer Part Number: CMC-7 ), ( Part Type: Idler Arm ), ( Country Of Origin: United States ), ( Vintage Part: Yes )

Review CARLSON Cmc Idler Arm Kit Packard Round Type Nos Vintage Auto Part fits 1951–1956

The **Carlson CMC-7 CMC Idler Arm Kit for 1951 1956 Packard Round Nose Automatic Transmission** is a meticulously engineered aftermarket upgrade designed to restore and enhance the performance, reliability, and longevity of your classic Packard s legendary automatic transmission. This kit replaces the stock CMC (Central Motor Corporation) idler arm assembly, a critical component that plays a pivotal role in the smooth operation of the transmission s planetary gear system. Crafted from high-quality, precision-machined steel, the CMC-7 idler arm kit ensures optimal engagement between the transmission s internal gears, reducing wear on the clutch packs, stator, and planetary carrier while minimizing slippage and harsh shifting. The kit includes a complete set of components, including the idler arm itself, a hardened steel roller bearing, a precision-ground spring, and all necessary hardware, all of which are designed to match the exact specifications of the original CMC assembly, ensuring a seamless fit with the 1951 1956 Packard s round-nose automatic transmission. Whether you re restoring a show-quality Packard or preparing your classic for high-performance driving, this kit eliminates the common issues associated with worn or failing idler arms, such as erratic shifting, excessive heat buildup, and premature transmission failure. Carlson s reputation for quality and attention to detail makes this kit a trusted choice among transmission specialists and enthusiasts alike, offering a straightforward yet transformative solution for those seeking to preserve the integrity of their Packard s automatic drivetrain.

### **Pros and Cons of buying a Carlson CMC-7 CMC Idler Arm Kit for 1951 1956 Packard Round-Nose Automatics**

#### **Pros**

1. **Compatibility and Fit** The Carlson CMC-7 kit is specifically designed for 1951 1956 Packard round-nose automatic transmissions, ensuring a precise fit without modifications. This reduces the risk of installation errors that could lead to premature wear or failure.

2. **Improved Durability** The idler arm assembly is a critical component in the transmission s shift mechanism. A high-quality aftermarket kit like this one is often built with stronger materials and better machining than OEM parts, reducing the likelihood of breakage or excessive wear over time.

3. **Easier Installation** Many aftermarket kits come with detailed instructions and sometimes even pre-assembled components, making the replacement process more straightforward for DIYers. This can save time and labor costs compared to sourcing individual OEM parts.

4. **Reliability** Carlson is a well-regarded brand in the classic car restoration and performance parts industry. Their products are known for durability, which means the idler arm kit is less likely to fail unexpectedly, especially in high-mileage or heavily driven vehicles.

5. **Cost-Effective Alternative to OEM** While not always cheaper than original parts, aftermarket kits like this one often provide a better value by combining quality with affordability. This is particularly useful for restorers or enthusiasts who want to maintain authenticity without excessive expense.

6. **Preventative Maintenance** Replacing worn or failing idler arms can prevent more extensive transmission damage. A new kit ensures smooth shifting and reduces the risk of internal transmission wear, which could lead to costly repairs down the line.

7. **Availability of Support** Carlson and other reputable manufacturers often provide customer support, warranties, or return policies. This can be reassuring for buyers who may not have experience working with transmission parts.

---

#### **Cons**

1. **Potential for Incompatibility with Modifications** If the transmission has been heavily modified (e.g., with performance parts, custom linkages, or non-standard shift mechanisms), the CMC-7 kit may not fit perfectly. Buyers should verify compatibility with any aftermarket modifications before purchasing.

2. **Quality Variability** While Carlson is a trusted brand, the quality of individual parts can sometimes vary depending on the specific batch or manufacturing run. Buyers should inspect the kit upon arrival for any defects or inconsistencies.

3. **Limited Customization** Unlike some high-performance aftermarket parts, this kit is designed for stock-like functionality. It may not offer performance upgrades (e.g., lighter materials for quicker shifts) and is primarily focused on reliability and fit.

4. **Installation Skill Required** While the kit is designed to be user-friendly, replacing an idler arm assembly still requires mechanical skill. A mistake during installation (e.g., improper alignment or torque) could lead to transmission issues. Those without experience may need to consult a professional.

5. **Cost Relative to OEM Parts** While often more affordable than sourcing all OEM parts, the CMC-7 kit may still be more expensive than buying individual components from a junkyard. However, this is usually offset by the convenience and quality of the kit.

6. **Warranty Limitations** Aftermarket warranties may not cover all potential issues, especially if the kit is installed incorrectly or used in extreme conditions (e.g., heavy towing or aggressive driving). Buyers should review the warranty terms carefully.

7. **Lead Times** Depending on the supplier, there may be delays in receiving the kit, especially if it is ordered from a specialty retailer or overseas manufacturer. Buyers should plan accordingly if they are working on a project with tight deadlines.

---

### **Conclusion**

The Carlson CMC-7 idler arm kit for 1951 1956 Packard round-nose automatics is a well-regarded choice for enthusiasts and restorers seeking a reliable, easy-to-install replacement for worn transmission components. Its primary strengths lie in its compatibility, durability, and ease of use, making it an excellent option for those prioritizing functionality and authenticity. However, buyers should be mindful of potential compatibility issues with modified transmissions, the need for careful installation, and the limitations of aftermarket warranties.

For most owners of these classic Packards, the benefits of using this kit particularly the reduction of shift linkage wear and the prevention of transmission damage outweigh the minor drawbacks. It is a practical investment for maintaining or restoring transmission performance without the hassle of sourcing OEM parts.

### **Recommendation**

- You are restoring or maintaining a 1951 1956 Packard round-nose automatic transmission.

- You want a reliable, easy-to-install replacement for the idler arm assembly.

- You are comfortable with basic transmission work or have access to a mechanic for installation.

- You prioritize quality and fit over custom performance modifications.

- Your transmission has been heavily modified, and you are unsure about compatibility.

- You lack mechanical experience and are not confident in performing the installation correctly.

- You are on a tight budget and can source individual OEM parts more cheaply (though this may not always be practical).

**Final Verdict:** The Carlson CMC-7 kit is a strong, well-supported choice for this application and is highly recommended for its balance of quality, convenience, and reliability. Always verify compatibility with your specific transmission and follow installation guidelines carefully to ensure optimal performance.

Details:

Unbeatable Prices Expectations: While many of our vintage parts were manufactured decades ago, they remain unused and high-quality. Position: Steering. Condition: NOS. Part Number: CMC-7.

Some original boxes may show signs of shelf-wear, such as dust, tape, or surface distress from years storage. Key Features:: Brand: CMC. These slight aesthetic differences are a result of historical production processes and do not impact the parts integrity, performance, or authenticity. Fitment:: Make: model: Year: Engine: Notes: Packard All model's 1951-1956 With Round Type Idler Arm Only.

Fits Years:: 1951 1952 1953 1954 1955 1956. Genuine CMC-7 Idler Arm Kit NOS: This is a New Old Stock NOS designed for 1951-1956 Packard model's with round type idler arms. This kit provides an anti-friction solution to improve steering performance and eliminate play looseness.

part #: cmc7 price

• $30.00

specifications pitmanidlear:

• for years: 1951-1956
• brand: Carlson
• mpn: Cmc-7
• part type: Idler Arm
• country of origin: United States
• vintage part: Yes

general pitmanidlear:

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

returns pitmanidlear:

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

seller pitmanidlear:

• rating: 99.9%
• # reviews: 16452
• city: Lewiston, Idaho

offer pitmanidlear:

• quantity: 1
• sold: 0
• options: Ship-to-home
• started: April 29, 2026
• availability: In Stock

payments pitmanidlear:

• wallet: Google-pay
• other
• credit card: Mastercard

shipping pitmanidlear:

• cost: $7.37
• carrier: USPS
• class: Standard, Expedited
• type: Calculated
• transit: 3-7 Days
• service: USPS Ground Advantage, USPS Priority Mail

Carlson CMC-7 Is Similar To:

• Cmc42 Carlson Nos 1958 1959 (23.4% similar) The arm is equipped with thrust bearings on both sides at ends. However, I only know of 1958 thru 1960 Chevrolet that had arrangement idler arm. Other countries, please inquire. An optional frame bracket made it possible to use these up shipping and handling charges are quoted for USA only. I ...(December 21st, 2017)
• Cmc46 Carlson Nos 1962 1963 (23.4% similar) Being offered is a ball bearing idler arm replacement kit by Carlson, their number CMC-46. According to their numerical listing, this fits 1962 thru 1964 Thunderbird. Not sure about this application as it conflicts with another kit which fits late 1962 and early shipping handling charges are ...(September 23rd, 2017)
• Cmc5f Carlson Nos 1962-70 Rambler (29.1% similar) Being offered is a ball bearing idler arm kit by Carlson, their part number CMC-5F. Shipping and handling charges are quoted for USA only. Old timers nicknamed it as: poor mans power steering. This low friction bushing replacement made steering easier...(January 3rd, 2018)
• Carlson Cmc-1 Idler Arm Kit 1950-54 Cadillac Nash Oldsmobile Pontiac Nors (53.5% similar) Unbeatable prices expectations: while many of our vintage parts were manufactured decades ago, they remain unused and high-quality. Condition: Norse new old replacement stock. Origin: made in USA. Fits years:: 1950 1951 1952 1953 1954. Fitment:: make: model: year: engine: notes: Buick special / ...(April 29th, 2026)
• Carlson Cmc-4b Idler Arm Kit Chevrolet Falcon Comet Thunderbird Nors (48.7% similar) This kit provides essential components for restoring the steering system of your classic vehicle, ensuring smooth and responsive handling. These slight aesthetic differences are a result of historical production processes and do not impact the parts integrity, performance, or authenticity. Genuine ...(April 29th, 2026)