2017 Jeep Cherokee Transmission & Axle Gear Ratios

When it comes to optimizing the performance of your 2017 Jeep Cherokee, understanding the transmission and axle gear ratios is crucial. These ratios directly influence everything from fuel economy to towing capacity and off-road prowess. This guide will break down the available options and help you make informed decisions about your vehicle's setup.

Transmission gear ratios

The 2017 Jeep Cherokee predominantly used the 9-speed automatic transmission (948TE), though a few variants might have come with a 6-speed manual or automatic depending on the market and engine.

9-Speed Automatic (948TE)

Available axle ratios

The 2017 Jeep Cherokee offered several axle ratios, depending on the engine, trim level, and 4x4 system. These ratios play a significant role in how the engine's power is delivered to the wheels.

How to identify your axle ratio

Identifying your Jeep Cherokee's axle ratio is essential for proper maintenance and upgrades. For Chrysler/Jeep vehicles, the most reliable way is typically through a VIN decoder or by checking the build sheet. Unlike some GM vehicles with RPO codes on the door jamb, Jeep often doesn't explicitly list the axle ratio on a sticker. However, you can often find codes on the rear axle housing itself. Alternatively, a dealership's service department can provide your vehicle's original build sheet using the VIN, which will detail all factory-installed options, including the axle ratio.

Towing vs MPG impact

Axle ratios have a direct and significant impact on your vehicle's performance characteristics:

• Numerically Lower Ratio (e.g., 3.25): A lower numerical ratio means the engine doesn't have to rev as high to maintain a given road speed. This generally results in better fuel economy on the highway. However, it also means less torque multiplication to the wheels, which can reduce towing capacity and make the vehicle feel less responsive, especially when accelerating from a stop or climbing steep grades.

• Numerically Higher Ratio (e.g., 3.73, 4.08): A higher numerical ratio means the engine will rev higher at a given road speed. This provides greater torque multiplication, which is beneficial for towing heavier loads, off-roading, and brisk acceleration. The trade-off is typically reduced fuel economy, particularly at highway speeds, as the engine is working harder.

For the 2017 Jeep Cherokee, if your primary use involves frequent towing or serious off-roading, a higher axle ratio like the 3.73 or 4.08 would be more suitable. If daily commuting and fuel efficiency are your main concerns, the 3.25 ratio is generally preferred.

Common issues

While the 2017 Jeep Cherokee's driveline components are generally robust, some common issues related to axles can arise:

• Ring & Pinion Whine: A high-pitched whining noise that typically changes with vehicle speed (and sometimes load) can indicate wear or improper setup of the ring and pinion gears. This is often more noticeable at certain speeds and can be exacerbated by towing or aggressive driving.

• Carrier Bearing Wear: The bearings that support the differential carrier can wear out, leading to a rumbling or growling noise, especially when turning or under acceleration. If left unaddressed, this can lead to further damage within the differential.

• Limited-Slip Clutch Wear (if equipped): If your Cherokee is equipped with a limited-slip differential, the clutch packs within it can wear over time. Symptoms might include shuddering or chattering from the rear end during turns, or a decrease in the effectiveness of the limited-slip feature.

Regular differential fluid changes with the correct fluid type are crucial for extending the life of these components and preventing premature wear.

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