2020 Jeep Grand Cherokee: Transmission & Axle Gear Ratios

Transmission Gear Ratios

The 2020 Jeep Grand Cherokee comes equipped with two available automatic transmissions.

850RE 8-Speed Automatic Transmission (TorqueFlite)

ZF 8HP70 8-Speed Automatic Transmission

Available Axle Ratios

How to Identify Your Axle Ratio

There are a few ways to identify your 2020 Jeep Grand Cherokee's axle ratio.

• VIN Decoder: The easiest and most reliable method is to use a VIN decoder. There are many online tools available that can provide a build sheet for your vehicle, which will include the axle ratio.
• Axle Tag: You can also check the axle itself for a tag. This tag will have information about the axle, including the gear ratio. The tag is usually located on the differential cover.
• Door Jamb Sticker: While some manufacturers include the axle ratio on the door jamb sticker, this is not always the case with Jeep. It is still worth a look, but it may not be present.

Towing vs. MPG Impact

The axle ratio has a significant impact on both towing capacity and fuel economy.

• Numerically Higher Ratio (e.g., 3.70): A higher number means that the driveshaft turns more times for each rotation of the wheels. This provides more torque to the wheels, which is ideal for towing heavy loads. However, the engine will be running at a higher RPM on the highway, which will result in lower fuel economy.
• Numerically Lower Ratio (e.g., 3.27): A lower number means that the driveshaft turns fewer times for each rotation of the wheels. This is better for fuel economy, as the engine will be running at a lower RPM on the highway. However, it will not provide as much torque for towing.

Common Issues

While the 2020 Jeep Grand Cherokee is a reliable vehicle, there are a few common issues to be aware of regarding the axles and differential.

• Ring and Pinion Whine: Some owners have reported a whining noise from the differential, which can be a sign of a problem with the ring and pinion gears. This is more common on vehicles that are used for frequent towing.
• Carrier Bearing Failure: The carrier bearings support the differential carrier, and they can fail over time. This can cause a rumbling or grinding noise from the differential.
• Limited-Slip Clutch Wear: On models equipped with a limited-slip differential, the clutches can wear out over time. This can cause the differential to lose its ability to transfer power to both wheels, which can be a problem in low-traction situations.

If you are experiencing any of these issues, it is important to have your vehicle inspected by a qualified mechanic.

Find a Driveline Shop on Repairius

If you need to have your 2020 Jeep Grand Cherokee's axle or differential serviced, you can find a qualified driveline shop on Repairius. Our network of certified shops can handle any repair, from a simple fluid change to a complete overhaul.