The Yukon Ring & Pinion Gear Set for Dana Spicer 70 axles and is an excellent choice for axle rebuilds, towing applications, heavy-duty street use, and restorations requiring balanced highway performance with dependable pulling power.Precision-machined tooth geometry and hardened gear surfaces are essential for proper load distribution, reduced friction, lower operating temperatures, and long-term durability in high-load axle applications. It is a strong option for diesel trucks, tow rigs, dually applications, and work vehicles that spend significant time on-road but still need usable torque under load.

Includes:

• Dana 70 Ring gear
• Matching pinion
• Available Gear Ratio: 3.54, 3.73, 4.11, 4.56, 4.88, 5.13, & 7.17

Sold as a matched gear set

Installation kit, bearings, shims, seals, and carrier components sold separately unless noted.

Specifications

• Brand: Yukon Gear & Axle
• Part Number: YG D70-354
• Product Type: Ring & pinion gear set
• Application: Dana Spicer 70
• Gear Ratio: 3.54, 3.73, 4.11, 4.56, 4.88, 5.13, & 7.17
• Ring Gear Diameter: 10.50"
• Pinion Spline Count: 29-spline
• Ring Gear Bolt Count: 12-bolts
• Cover Bolt Count: 10-bolts
• Quantity: Sold as a matched set

Fitment

• Verify axle model, spline count, carrier compatibility, and current ratio before ordering.

Tech Insight

What gear ratio should I choose for my Dana 70 axle?

The best Dana 70 gear ratio depends on tire size, vehicle weight, towing requirements, and transmission gearing. Ratios like 3.54 and 3.73 are excellent for highway driving and towing, while deeper ratios such as 4.56, 4.88, and 5.13 provide improved acceleration, towing power, and off-road performance. Extreme ratios like 7.17 are commonly used in specialized off-road and competition applications.

Is the Dana 70 a good axle for towing and heavy-duty trucks?

Yes. The Dana 70 is one of the most respected heavy-duty axles ever produced. Its large 10.5-inch ring gear, robust carrier design, and high load capacity make it a popular choice for diesel trucks, duallys, commercial vehicles, motorhomes, tow rigs, and work trucks that regularly carry heavy loads.

Will changing my Dana 70 gear ratio improve towing performance?

Absolutely. Proper gearing can significantly improve towing capability by keeping the engine in its optimal power band. If you've installed larger tires or regularly tow heavy trailers, switching to a deeper gear ratio can improve acceleration, reduce transmission strain, and enhance overall drivability.

Do I need a master install kit when replacing Dana 70 gears?

Yes. A complete install kit typically includes bearings, races, shims, seals, pinion nut, and other setup components needed to properly install new ring and pinion gears. Replacing these wear items during installation helps ensure proper gear setup and maximizes gear life.

Can these Yukon Dana 70 gears be used in off-road builds?

Yes. While the Dana 70 is commonly associated with towing and heavy-duty truck use, it is also widely used in rock crawlers, mud trucks, custom 4x4 builds, and competition vehicles. Its strength and aftermarket support make it a popular choice for applications requiring maximum durability.