FORD 7L7Z-17D948-D Bumper Inserts Covers
fits model: Navigator. make: Ford. year: 2007–2017.
( Manufacturer Part Number: 7L7Z-17D948-D ), ( Part Type: Cover Bumper ), ( Genuine Oem: Yes ), ( Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Make: Lincoln ), ( Year: 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 ), ( Parts Included: Only Part Reference 6 On The Diagram Is Included )
Review FORD Genuine Side Support fits NAVIGATOR 2007–2017
The **Ford 7L7Z-17D948-D** is a high-performance, heavy-duty automatic transmission designed for Ford s full-size trucks, including models like the F-250, F-350, and Super Duty series, as well as select commercial and off-road applications. This transmission is a member of Ford s legendary **7-speed automatic family**, engineered to deliver exceptional torque capacity, durability, and efficiency for demanding workloads. Built with a robust **planetary gearset architecture**, the 7L7Z incorporates advanced hydraulic and electronic controls to ensure smooth shifting, precise torque conversion, and reliable performance under extreme conditions. Its **D948-D designation** indicates a specific variant optimized for high-torque applications, featuring a reinforced housing, upgraded internal components, and enhanced cooling capabilities to prevent overheating during prolonged heavy-duty use.
At the heart of the 7L7Z-17D948-D lies a **torque converter with a lockup clutch**, allowing for improved fuel efficiency by reducing slippage at higher speeds while maintaining full power delivery when needed. The transmission s **7-speed progression** ranging from a low first gear for towing and off-roading to a high seventh gear for highway cruising provides an optimal balance between power and efficiency, reducing engine strain while maximizing acceleration. The **D948-D variant** is particularly notable for its **increased torque rating**, making it ideal for towing heavy trailers, hauling large loads, or operating in rugged terrains where consistent power and stability are critical.
The 7L7Z-17D948-D is constructed with **high-strength steel and precision-machined components**, ensuring longevity and resistance to wear even under the most punishing conditions. Its **integrated torque converter and pump assembly** is designed for durability, with reinforced bearings and seals to minimize fluid leakage and extend service intervals. The transmission also features **Ford s advanced transmission control module (TCM)**, which works in tandem with the vehicle s engine management system to optimize shifting strategies, adapt to driving conditions, and provide seamless integration with modern infotainment and driver-assist technologies.
For applications requiring maximum reliability, the 7L7Z-17D948-D is compatible with **Ford s premium transmission fluids**, such as **Mercon LV or the newer Mercon SP**, which enhance lubrication, reduce friction, and protect internal components from degradation. The transmission s **cooling system**, which may include an external cooler or integrated radiator, ensures that heat is efficiently dissipated, preventing overheating during extended operation. Additionally, the **shift-by-wire technology** (in newer applications) allows for precise, responsive gear selection, whether through the shifter, paddle shifters, or automated driving modes.
Whether installed in a **Ford F-250 Super Duty for towing a heavy load**, a **F-350 for construction work**, or a **custom off-road rig for extreme terrain**, the 7L7Z-17D948-D delivers a blend of **raw power, adaptability, and engineering precision**. Its reputation for **durability and performance** makes it a favored choice among fleet operators, enthusiasts, and professionals who demand a transmission that can handle the toughest challenges without compromise. With proper maintenance including regular fluid changes, filter replacements, and inspections this transmission is built to last for hundreds of thousands of miles, making it a cornerstone of Ford s heavy-duty lineup.
### **Pros and Cons of buying a Ford 7L7Z-17D948-D Transmission**
The **Ford 7L7Z-17D948-D** is a heavy-duty automatic transmission commonly found in Ford F-250, F-350, and Super Duty trucks with **6.7L Power Stroke diesel engines**. Below is a detailed breakdown of its advantages and disadvantages, followed by a conclusion and recommendation.
---
### **Pros of the 7L7Z-17D948-D Transmission**
1. **High Torque Handling**
- Designed to handle the high torque output of the **6.7L Power Stroke** (up to **1,050 lb-ft**), making it ideal for towing and hauling heavy loads. It is built to manage the power of turbocharged diesel engines without excessive wear.
2. **Durability and Longevity**
- The **7L7Z** is a robust transmission with a reputation for lasting **200,000 miles** with proper maintenance. Its heavy-duty construction includes reinforced internals, thick-walled bearings, and a robust torque converter.
- Many owners report that with regular fluid changes and proper driving habits, this transmission can outlast the engine itself.
3. **Smooth Shifting Performance**
- When properly tuned and maintained, the **7L7Z** provides smooth, predictable shifts. It is designed for heavy-duty applications, where quick, aggressive shifts are less critical than reliability.
- The **17D948-D** variant (a specific control module or software iteration) may offer slight refinements in shift quality compared to earlier models.
4. **Compatibility with Ford s Heavy-Duty Platform**
- This transmission is engineered to work seamlessly with Ford s **6.7L Power Stroke** and other high-output diesel engines. It is part of Ford s **6-speed automatic** lineup, which is optimized for towing and off-road use.
- It pairs well with **Ford s 10-speed automatic (10R80)** in newer models, though the **7L7Z** remains a popular choice in older or modified trucks.
5. **Aftermarket Support and Upgrades**
- The **7L7Z** has a strong aftermarket presence, with available upgrades such as:- **Transmission coolers** (essential for heavy-duty use to prevent overheating).
- **Clutch kits** (for extended life in extreme towing scenarios).
- **Shift solenoids and valve bodies** (for improved shift feel or troubleshooting).
- **Torque converter upgrades** (for better torque multiplication in high-torque applications).
- Tuning options (e.g., **Ford Power Stroke Tuners**) can optimize shift points and torque delivery.
6. **Lower Cost Compared to 10-Speed Alternatives**
- While newer trucks come with the **10-speed automatic (10R80)**, the **7L7Z** is significantly cheaper to purchase used or rebuild. This makes it a cost-effective choice for budget-conscious buyers.
- Rebuilding costs are also lower than some high-end transmissions, though labor can be intensive.
7. **Proven Reliability in Extreme Conditions**
- Many **7L7Z** transmissions have been used in **off-road, racing, and heavy-duty towing applications** with minimal issues, provided they are maintained properly. This includes use in **rock crawling, logging trucks, and tow rigs**.
8. **Ease of Maintenance (Compared to Some Alternatives)**
- While not as simple as a passenger-car transmission, the **7L7Z** is more straightforward to service than some **heavy-duty industrial transmissions**. Fluid changes, filter replacements, and basic diagnostics are manageable for experienced DIYers.
---
### **Cons of the 7L7Z-17D948-D Transmission**
1. **Complexity and Maintenance Requirements**
- The **7L7Z** is a **heavy-duty transmission**, meaning it requires **more frequent and thorough maintenance** than a typical passenger-car automatic. Key maintenance tasks include:
- **Fluid changes every 30,000 50,000 miles** (or more frequently in extreme conditions). Using **Ford Motorcraft ATF 4** or a high-quality synthetic alternative is recommended.
- **Filter replacements** (both the transmission filter and the torque converter filter, if equipped).
- **Cooler system checks** (clogged coolers can lead to overheating and failure).
- Neglecting maintenance can lead to **premature wear, slipping, or complete failure**.
2. **Harsh Shifting in Some Cases**
- While the **7L7Z** is designed for durability, it is not as refined as a **10-speed automatic** in terms of shift smoothness. Some owners report:
- **Delayed or jerky shifts** if the transmission fluid is old or contaminated.
- **Harsh upshifts** in aggressive driving conditions (e.g., towing or off-roading).
- The **17D948-D** variant may improve shift quality slightly, but it is not as polished as newer transmissions.
3. **Sensitivity to Overheating**
- The **7L7Z** is not as forgiving as some modern transmissions when it comes to **overheating**. Prolonged exposure to high temperatures (e.g., from heavy towing without a cooler) can lead to:
- **Fluid breakdown** (reducing lubrication and cooling properties).
- **Seizure of internal components** (such as clutches or bearings).
- A **dedicated transmission cooler** is **highly recommended** for any serious towing application.
4. **Potential for Electronic Issues**
- Like many modern transmissions, the **7L7Z** relies on **electronic controls** (PCM, shift solenoids, and sensors). Common electronic problems include:
- **Faulty solenoids** (causing hard shifts or no shifts at all).
- **PCM or transmission control module (TCM) glitches** (leading to check engine lights or erratic behavior).
- **Sensor failures** (e.g., speed sensors or temperature sensors).
- Diagnosing and fixing these issues often requires **scan tools and some mechanical expertise**.
5. **Rebuild Costs Can Be High**
- While the **7L7Z** is durable, **rebuilding it is labor-intensive and expensive**. A full rebuild typically involves:- **Disassembling the transmission** (a multi-day process for experienced mechanics).
- **Replacing worn clutches, bands, bearings, and seals**.
- **Machining or replacing the torque converter** if damaged.
- **Costs ranging from $3,000 $6,000 **, depending on labor rates and parts quality.
- This makes it less appealing for casual drivers who may not want to invest in repairs.
6. **Limited Availability of New/Used Units**
- As newer Ford trucks shift to the **10-speed automatic (10R80)**, the **7L7Z** is becoming less common in new applications. This means:- **Used units may be harder to find** in good condition.
- **Parts and rebuild kits** are still available but may be less standardized than for newer transmissions.
- If you re looking for a **brand-new transmission**, you ll likely need to source it from a **specialty transmission shop** or rebuild facility.
7. **Not Ideal for High-Speed or Freeway Use**
- The **7L7Z** is optimized for **torque and towing**, not for **high-speed cruising**. Some owners report:- **Excessive noise** (whining or humming) at highway speeds if the transmission is not properly tuned or maintained.
- **Less efficient fuel economy** compared to a modern 10-speed transmission, as it may not shift as optimally for highway driving.
- If you primarily drive on highways, a **10-speed automatic** may feel more refined.
8. **Potential for Torque Converter Issues**
- The **torque converter** in the **7L7Z** can be a weak point, especially in high-torque applications. Common issues include:- **Slippage** (leading to poor acceleration).
- **Overheating** (if the converter is not properly sized for the engine).
- **Failure of the clutch pack** (requiring replacement).
- Upgrading to a **heavy-duty torque converter** (e.g., a **7.5-inch or larger unit**) can improve performance but adds cost.
9. **Compatibility Limitations**
- While the **7L7Z** works well with the **6.7L Power Stroke**, it is **not compatible** with all Ford engines. For example:- It **cannot be used** with **gasoline V8 engines** (e.g., 5.0L or 6.2L Coyote) without significant modifications.
- It is **not a drop-in replacement** for the **10-speed automatic** in newer trucks.
- If you re considering a **transmission swap**, ensure compatibility with your engine and drivetrain.
10. **Learning Curve for DIY Maintenance**
- Unlike simpler transmissions, the **7L7Z** requires **mechanical knowledge** to service. Tasks such as:- **Fl
Details:
Parts must be resalable and in the original packaging. Electrical parts are not returnable.
part #: 7l7z17d948 prices
- $44.25-$61.51
specifications vintagecarbumperus:
- for models: Navigator
- for makes: Ford
- for years: 2007-2017
- mpn: 7l7z-17d948-d
- part type: Cover Bumper
- genuine oem: Yes
- warranty: 1 Year
- fitment type: Direct Replacement
- make: Lincoln
- year: 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
- parts included: Only Part Reference 6 On The Diagram Is Included
shipping vintagecarbumperus:
- type: Fixed
- class: Standard, Expedited, One-day
- transit: 3-7 Days
- cost: $0.00
- service: Standard, Expedited, Overnight
seller vintagecarbumperus:
- rating: 100.0%
- city: Quincy, Massachusetts
- # reviews: 5275
payments vintagecarbumperus:
- wallet: Apple-pay
- other
- credit card: Mastercard
general vintagecarbumperus:
- Exterior Parts Accessories > Bumpers Components > Bumper Inserts Covers
- condition: New
returns vintagecarbumperus:
- policy: Returns Accepted
- time: 30 Days
- paid by: Seller
offer vintagecarbumperus:
- options: Ship-to-home
- quantity: 1
- sold: 0
- availability: In Stock
- started: February 17, 2026
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