2014 Ram 1500 Transmission & Axle Gear Ratios

Transmission gear ratios

The 2014 Ram 1500 offered two primary transmission options: the 6-speed 65RFE automatic and the 8-speed 8HP70 automatic. The 8HP70, sourced from ZF, was a significant upgrade, offering improved fuel economy and performance.

6-speed 65RFE Automatic

8-speed 8HP70 Automatic

Available axle ratios

The 2014 Ram 1500 offered a variety of axle ratios to cater to different needs, from maximizing fuel economy to heavy-duty towing.

How to identify your axle ratio

Identifying your Ram 1500's axle ratio is crucial when considering modifications or just understanding your truck's capabilities. Unlike some manufacturers that use a door-jamb RPO sticker with easily readable codes, Ram (and Chrysler/Dodge in general) often requires a bit more digging.

Axle Tag: The most direct way to identify your axle ratio is to look for a metal tag attached to one of the differential cover bolts on the rear axle housing. This tag will typically stamped with numbers like "3.21," "3.55," or "3.92," indicating the ratio. It might also contain other codes relevant to the differential type (e.g., limited-slip).

VIN Decoder: You can also use your vehicle's VIN (Vehicle Identification Number) to get a detailed build sheet from a Ram dealership or an online VIN decoder service. This build sheet will list all the factory options, including the axle ratio, often denoted by a 3-digit code.

Dealer Service Department: A quick call to your local Ram dealership's service department with your VIN can also provide you with the exact axle ratio your truck came with from the factory.

Towing vs MPG impact

The choice of axle ratio has a significant impact on both your truck's towing capability and its fuel economy.

• Numerically Lower Ratios (e.g., 3.21): A numerically lower axle ratio means the engine spins fewer revolutions for each rotation of the wheels. This translates to lower engine RPMs at cruising speeds, resulting in better fuel economy. However, it also means less mechanical advantage for the engine, reducing towing capacity and acceleration.

• Numerically Higher Ratios (e.g., 3.92): Conversely, a numerically higher axle ratio means the engine spins more revolutions for each rotation of the wheels. This provides greater mechanical advantage, significantly boosting towing capacity and off-the-line acceleration. The trade-off is higher engine RPMs at cruising speeds, leading to decreased fuel economy.

For the 2014 Ram 1500, the 3.21 ratio was geared towards maximizing MPG for daily driving, especially with the 8-speed transmission. The 3.55 offered a good balance, while the 3.92 was the go-to for owners who frequently towed heavy loads or desired stronger acceleration.

Common issues

While the drivetrains of the 2014 Ram 1500 are generally robust, some common issues can arise with differential components.

• Ring and Pinion Whine: A persistent whining noise that changes with vehicle speed (and often pitch when accelerating or decelerating) can indicate wear or improper setup of the ring and pinion gears within the differential. This can be caused by low fluid, heavy towing, or simply age.

• Carrier Bearing Wear: The carrier bearings support the differential carrier assembly. Signs of wear include a growling or rumbling noise that may get louder as vehicle speed increases. If left unaddressed, worn carrier bearings can lead to more extensive differential damage.

• Limited-Slip Clutch Pack Wear: If your Ram 1500 is equipped with a limited-slip differential, the internal clutch packs can wear out over time. This can result in a clunking or chattering noise, especially when turning at low speeds. It also diminishes the effectiveness of the limited-slip feature, reducing traction in slippery conditions.

Regular differential fluid changes using the manufacturer-specified lubricant can help prevent these issues and prolong the life of your axle components.

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