2024 Ram 2500 Transmission & Axle Gear Ratios

Transmission gear ratios

The 2024 Ram 2500 offers two robust transmission options designed to handle the demands of heavy-duty work and towing: the 8HP75 8-speed automatic for gasoline engines and the 68RFE 6-speed automatic for diesel engines.

8HP75 8-Speed Automatic (Gasoline)

This advanced eight-speed automatic transmission provides a wide ratio spread, optimizing both acceleration and fuel efficiency for the 6.4L HEMI V8 engine.

68RFE 6-Speed Automatic (Diesel)

Paired with the legendary 6.7L Cummins Turbo Diesel engine, the 68RFE six-speed automatic transmission is engineered for durability and impressive torque delivery.

Available axle ratios

Ram offers several axle ratio options for the 2024 2500, allowing buyers to tailor their truck's performance to specific needs, whether it's maximizing towing capacity or optimizing fuel economy.

How to identify your axle ratio

Identifying the axle ratio on your 2024 Ram 2500 is crucial for proper maintenance, modifications, and understanding your truck's capabilities. Unlike some manufacturers that use RPO stickers on the door jamb for axle codes, Ram trucks typically require a different method.

Axle Tag: The most reliable way to identify your Ram's axle ratio is by locating the metal tag attached to one of the differential cover bolts on the rear axle. This tag usually contains the gear ratio stamped on it. You might need to clean the area to read it clearly.

VIN Decoder: Many online VIN decoders or a visit to a Ram dealership can provide detailed build information, including your truck's original axle ratio, using your Vehicle Identification Number.

Towing vs MPG impact

The choice of axle ratio significantly impacts your truck's towing capability and fuel economy.

• Numerically Lower Ratio (e.g., 3.73): A numerically lower ratio means the engine turns fewer revolutions per minute (RPM) at a given road speed. This generally results in better fuel economy on the highway, as the engine is operating at a lower, more efficient RPM range. However, it also means less mechanical advantage for towing, requiring the engine to work harder to pull heavy loads, potentially reducing towing capacity and increasing transmission temperatures during heavy use.

• Numerically Higher Ratio (e.g., 4.10): A numerically higher ratio means the engine turns more RPMs at a given road speed. This provides a greater mechanical advantage for towing, allowing the truck to pull heavier loads with less strain on the engine and transmission. While excellent for heavy hauling, a higher axle ratio typically leads to lower fuel economy due to the engine operating at higher RPMs more frequently.

For the 2024 Ram 2500, a 3.73 axle ratio offers a balanced approach, suitable for daily driving and moderate towing. The 4.10 ratio is the preferred choice for those who frequently tow heavy trailers or engage in demanding off-road activities, such as with the Power Wagon.

Common issues

While the transmissions and axles in the 2024 Ram 2500 are built for durability, certain issues can arise with heavy use or high mileage, regardless of the brand.

• Ring & Pinion Whine: A common symptom of worn gears, improper gear setup, or bearing issues within the differential is a distinct whining noise that changes pitch with vehicle speed. This often indicates excessive backlash or improper contact patterns between the ring and pinion gears.

• Carrier Bearing Wear: The carrier bearings support the differential carrier within the axle housing. Wear in these bearings can lead to humming, rumbling, or grinding noises, especially noticeable during acceleration or deceleration. If left unaddressed, it can cause further damage to the differential.

• Limited-Slip Clutch Wear: For trucks equipped with a limited-slip differential, the internal clutch packs can wear out over time, especially with aggressive driving or a lack of proper maintenance. Symptoms include a loss of traction in slippery conditions, chattering or clunking noises during turns, or a differential that acts like an open differential.

Regular differential fluid changes and inspections are crucial for extending the life of your axle components and catching potential issues early.

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