MOPAR 68172255AA Rear Rail Left

( Manufacturer Part Number: 68172255AA ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 12 On The Diagram Is Included ), ( Type: Brackets, Flanges And Hangers )

Review MOPAR Genuine Rear Rail Left

The **Mopar 68172255AA Rear Rail (Left Side)** is a high-performance, precision-engineered component designed exclusively for Ford and Lincoln vehicles equipped with the iconic 5.0L (302 cubic inch) Windsor V8 engine, particularly those built between the late 1980s and early 2000s. This left-side rear main bearing rail is a critical structural element of the engine s crankshaft assembly, providing rigid support and alignment for the crankshaft s main bearings while ensuring optimal oil flow and lubrication under high-stress conditions. Crafted from high-grade cast iron, this rail is machined to exacting tolerances to guarantee a seamless fit with the engine block, minimizing vibration and maximizing durability. The 68172255AA is a direct replacement part, meticulously designed to match the original equipment specifications, making it an ideal choice for both restoration projects and high-mileage engines requiring a reliable upgrade. Whether installed in classic muscle cars like the Ford Mustang, Thunderbird, or Explorer, or in luxury models such as the Lincoln Town Car, this rear rail is engineered to withstand the demands of aggressive driving, towing, or heavy-duty applications. Its robust construction and compatibility with aftermarket components such as performance crankshafts, rods, and pistons make it a versatile upgrade for enthusiasts seeking enhanced engine longevity and performance. Proper installation requires careful attention to gasket surfaces, torque specifications, and oil passage alignment to ensure optimal function, but the result is a reinforced foundation for a more resilient and high-revving V8.

### **Pros and Cons of buying a Mopar 68172255AA Rear Rail (Left Side)**

#### **Pros**

1. **Direct Fitment** This part is designed specifically for certain Mopar vehicles, ensuring compatibility without the need for extensive modifications. It is a direct replacement for the original rear axle rail, which reduces guesswork in installation.

2. **Durability** Mopar parts are known for their robust construction, often using high-quality materials like stamped steel or reinforced components. The rear rail is a structural part of the axle assembly, so a well-built unit will resist wear and stress better than aftermarket knockoffs.

3. **Warranty Coverage** Purchasing from an authorized Mopar dealer or official distributor typically includes a warranty, providing peace of mind against manufacturing defects. This can be valuable if the part fails prematurely.

4. **Compatibility with Other Mopar Components** Since it s part of the Mopar lineup, it integrates seamlessly with other factory-specified parts like axles, differentials, and suspension components, reducing the risk of compatibility issues.

5. **Reliability in Performance** The rear rail supports the weight of the vehicle and absorbs road shocks. A genuine Mopar part is less likely to fail catastrophically compared to cheaper, lower-quality alternatives.

6. **Ease of Installation** Being a factory-replacement part, it often follows standard mounting points and bolt patterns, making installation more straightforward for mechanics familiar with Mopar vehicles.

7. **Support for Original Vehicle Performance** If you re restoring or maintaining a classic Mopar vehicle (e.g., Dodge Challenger, Charger, or Durango), using OEM parts helps preserve the original performance and handling characteristics.

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#### **Cons**

1. **Higher Cost** Genuine Mopar parts are typically more expensive than aftermarket alternatives. The price reflects the brand s reputation, warranty, and quality, which may not be justified if you re on a tight budget.

2. **Limited Customization** Unlike aftermarket parts, this is a stock replacement. If you re looking for performance upgrades (e.g., wider rails for off-roading or racing), you ll need to source aftermarket options instead.

3. **Potential Overkill for Modern Vehicles** If you re working on a newer Mopar vehicle (e.g., 2010s models), some argue that aftermarket parts may offer better value due to advancements in materials and manufacturing processes. However, for classic or high-mileage vehicles, OEM parts can be ideal.

4. **Availability Issues** Depending on the vehicle model and year, genuine Mopar parts may be harder to find, especially for older or discontinued models. You might need to order from a specialty dealer, which could delay repairs.

5. **Weight Considerations** While durable, the rear rail is a heavy component. If you re modifying the vehicle for weight reduction (e.g., for racing), this part may not be the best choice, as it doesn t offer any weight-saving benefits over the original.

6. **Potential for Counterfeit Parts** Buying from unauthorized sellers (e.g., eBay, Facebook Marketplace) risks receiving counterfeit or low-quality parts labeled as "Mopar." Always purchase from verified dealers to avoid this issue.

7. **No Performance Enhancements** This is a replacement part, not an upgrade. If you re looking to improve handling, towing capacity, or off-road capability, you ll need to pair it with additional modifications (e.g., aftermarket axles, suspension upgrades).

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### **Conclusion**

The **Mopar 68172255AA rear rail (left side)** is an excellent choice if you prioritize **reliability, warranty coverage, and direct fitment** for your Mopar vehicle. It s ideal for **restorations, classic car maintenance, or situations where OEM quality is non-negotiable**. However, if you re working on a budget, seeking performance upgrades, or need parts for a newer vehicle, aftermarket alternatives might offer better value.

For **classic or high-mileage Mopar vehicles**, this part is a **safe, long-term investment** that minimizes compatibility risks. For **modern or performance-focused builds**, weigh the cost against potential aftermarket benefits.

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### **Recommendation**

- **Buy from an authorized Mopar dealer or official distributor** to ensure authenticity and warranty coverage.

- **Verify compatibility** with your exact vehicle model and year to avoid mismatches.

- **Consider aftermarket options** if you re looking for cost savings or performance upgrades.

- **Factor in installation costs** if you re not experienced with axle work, budget for professional labor.

- **If restoring a classic vehicle**, prioritize OEM parts like this one to maintain original integrity.

**Final Verdict:** If you need a **direct, high-quality replacement** for your Mopar rear axle rail and can afford the premium, this is a **strong choice**. If you re open to alternatives for cost or performance reasons, explore reputable aftermarket brands with good reviews.

Details:

Nobody likes the return process so let us help you. Parts must be resalable and in the original packaging. That's why we maintain a robust inventory, ensuring fast shipping, and minimizing downtime. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

Electrical parts are not returnable.

part #: 68172255aa prices

• $15.38-$15.62

specifications frontbumperus:

• for makes: Mopar
• mpn: 68172255aa
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• parts included: Only Part Reference 12 On The Diagram Is Included
• type: Brackets, Flanges And Hangers

payments frontbumperus:

• other
• credit card: Mastercard
• wallet: Paypal

shipping frontbumperus:

• class: Standard, Expedited, One-day
• service: Standard, Expedited, Overnight
• cost: $0.00
• type: Fixed
• transit: 8-14 Days

returns frontbumperus:

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

offer frontbumperus:

• quantity: 3
• options: Ship-to-home
• sold: 0
• availability: In Stock
• started: February 23, 2026

seller frontbumperus:

• # reviews: 2555
• city: Orlando, Florida
• rating: 99.1%

general frontbumperus:

• Exterior Parts Accessories > Bumpers Components > Bumpers Reincements
• condition: New

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