2016 Jeep Wrangler Transmission & Axle Gear Ratios

Transmission gear ratios

The 2016 Jeep Wrangler was offered with two transmission options: a 6-speed manual and a 5-speed automatic.

NSG370 6-Speed Manual Transmission

W5A580 5-Speed Automatic Transmission

Available axle ratios

How to identify your axle ratio

Identifying your axle ratio in a 2016 Jeep Wrangler is straightforward. The easiest way is to check the build sheet or the door jamb sticker. Look for a three-digit RPO code (Regular Production Option). For the 2016 Wrangler, the axle ratio codes are typically: DM6 for 3.21, DME for 3.73, and DM7 for 4.10. These codes are usually found on a sticker located on the driver's side door jamb.

Alternatively, if the sticker is no longer legible or present, you can identify the axle ratio by inspecting the axle itself. There might be a metal tag attached to one of the differential cover bolts, although this is less common on newer vehicles. For a definitive answer without relying on stickers or tags, you can contact a Jeep dealership with your VIN, and they can provide you with the original build sheet information for your vehicle.

Towing vs MPG impact

The axle ratio significantly influences your Jeep Wrangler's performance characteristics, particularly concerning towing capability and fuel economy. A numerically lower axle ratio, such as 3.21, means the engine will operate at lower RPMs at a given road speed. This generally translates to better fuel economy on the highway, as the engine doesn't have to work as hard to maintain speed. However, this comes at the cost of reduced acceleration and diminished towing capacity, as there is less mechanical advantage for moving heavy loads.

Conversely, a numerically higher axle ratio, like 4.10, causes the engine to rev higher at the same road speed. This provides a greater mechanical advantage, resulting in improved acceleration, enhanced crawling capabilities for off-roading, and a substantially higher towing capacity. The downside, however, is a decrease in fuel economy, especially at highway speeds, due to the engine working harder to maintain pace.

The 3.73 axle ratio serves as a balanced option, offering a good compromise between towing capability and fuel efficiency, making it a popular choice for those who need to tow occasionally but also value reasonable fuel consumption for daily driving.

Common issues

While the 2016 Jeep Wrangler's driveline components are generally robust, a few common issues can arise with axle gears and related components:

• Ring and Pinion Whine: A persistent whining noise that changes with vehicle speed and throttle input can often indicate wear or improper setup of the differential's ring and pinion gears. This can be caused by improper backlash, worn bearings, or insufficient lubrication.
• Carrier Bearing Wear: The carrier bearings support the differential carrier within the axle housing. Worn carrier bearings can produce a rumbling or growling noise, especially when turning or under acceleration, and can lead to excessive play in the differential.
• Limited-Slip Clutch Wear: Many Wranglers, particularly those with certain packages, are equipped with a limited-slip differential (LSD). Over time, the clutch packs within an LSD can wear out, leading to a loss of the limited-slip function and sometimes clunking noises or shuddering during turns as the clutches slip or bind unevenly.

Regular differential fluid changes with the correct type and amount of fluid, including any necessary friction modifiers for limited-slip differentials, are crucial for prolonging the life of these components.

Find a driveline shop on Repairius.