2014 Jeep Grand Cherokee Transmission Type
The 2014 Jeep Grand Cherokee. It's a name synonymous with rugged capability, luxurious comfort, and a surprising amount of on-road refinement. But beneath that sculpted sheet metal lies a critical component that dictates how all that power gets to the ground: the transmission. While seemingly a simple topic, diving into the specifics reveals a fascinating story of engineering choices and model-specific variations. So, buckle up, because we're about to explore the intricacies of the 2014 Grand Cherokee's transmission offerings.
The 8-Speed Automatic: A Universal (Almost) Hero
The star of the show is undoubtedly the ZF 8HP45/8HP70 8-speed automatic transmission. This gearbox, licensed and built by Chrysler as the 845RE, was a game-changer for the Grand Cherokee, replacing the older 5-speed automatic and dramatically improving fuel economy, performance, and overall driving experience. However, the "universal" descriptor comes with a caveat, as the specific variant used depended on the engine.
Let's break down the pairings:
| Engine | Transmission Variant | Torque Capacity (Nm) |
|---|---|---|
| 3.6L Pentastar V6 | 845RE (8HP45 derivative) | 450 Nm (332 lb-ft) |
| 5.7L Hemi V8 | 8HP70 (845RE derivative) | 700 Nm (516 lb-ft) |
| 3.0L EcoDiesel V6 | 8HP70 (845RE derivative) | 700 Nm (516 lb-ft) |
| 6.4L Hemi V8 (SRT) | 8HP70 (Reinforced) | 700 Nm (516 lb-ft) - *Note: May have reinforced components* |
As you can see, both the 5.7L Hemi and the 3.0L EcoDiesel utilize the 8HP70 variant, necessary to handle their higher torque outputs. While officially listed with the same torque capacity as the standard 8HP70, anecdotal evidence and some sources suggest the SRT version of the 8HP70 may have received some internal reinforcements to withstand the constant pounding from the 6.4L Hemi. Jeep wasn't keen to advertise these differences.
Driving Impressions: Noticeable Differences
The 8-speed automatic offers a significant improvement over the previous 5-speed. The shifts are quicker, smoother, and more intuitive. The increased number of gears keeps the engine in its optimal power band, resulting in better acceleration and fuel efficiency. However, subtle differences exist between the V6 and V8/Diesel models.
- 3.6L Pentastar: The 8-speed feels well-matched to the V6. It makes the most of the engine's available power, offering smooth and responsive acceleration. Gear changes are almost imperceptible during normal driving.
- 5.7L Hemi: With the Hemi, the 8-speed transforms the Grand Cherokee into a true performance SUV. The abundance of torque means effortless acceleration in any gear. Downshifts are quick and decisive, providing instant power for overtaking.
- 3.0L EcoDiesel: The 8-speed complements the diesel's low-end grunt perfectly. It allows the engine to operate in its sweet spot, maximizing fuel economy and providing ample torque for towing and off-roading.
- 6.4L Hemi (SRT): The transmission’s responsiveness is paramount in the SRT. It needs to handle brutal launches and quick shifts under immense strain. The SRT benefits from unique software tuning that prioritizes performance, resulting in aggressive downshifts and minimal torque converter slip.
Pros & Cons of the 8-Speed Automatic
Pros:
- Significantly improved fuel economy compared to the previous 5-speed.
- Quicker and smoother gear changes.
- Improved acceleration and overall performance.
- More intuitive gear selection.
- Enhanced towing capabilities.
Cons:
- Some owners have reported occasional harsh shifts, particularly in early production models.
- The complexity of the transmission can make repairs more expensive.
- Potential for "hunting" for the right gear in certain driving conditions, although this is relatively rare.
Transfer Cases: Not Just One Flavor
While the 8-speed transmission is the primary focus, it's important to remember that the Grand Cherokee's 4x4 system relies on a transfer case to distribute power to the front and rear axles. The 2014 model offers several different transfer case options, each with its own capabilities and characteristics, depending on the trim level and chosen 4x4 system. These include Quadra-Trac I, Quadra-Trac II, and Quadra-Drive II, each offering varying degrees of off-road prowess. The Quadra-Drive II features an electronic limited-slip differential (ELSD) in the rear axle, providing even greater traction in challenging conditions.
Final Thoughts: An Evolution of Drivetrain Excellence
The 2014 Jeep Grand Cherokee's 8-speed automatic transmission was a major step forward in terms of performance, efficiency, and overall driving experience. While some minor issues have been reported, the benefits far outweigh the drawbacks. The specific variant used in each model is carefully chosen to optimize performance and durability, making the 2014 Grand Cherokee a well-engineered and capable SUV. The various transfer case options further enhance its off-road capabilities, making it a versatile choice for a wide range of drivers.
Now for the fun part: Let's debate! Which engine/transmission combo from the 2014 Grand Cherokee lineup is the *ultimate* choice for a cross-country road trip, considering fuel efficiency, power, and overall comfort? V6 with the 8-speed for maximizing MPG? Hemi for effortless cruising? Or the EcoDiesel for its torquey efficiency? Let the arguments begin!