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The universal joints act as inner and outer pivots for the top link, which rotates to transmit drive from its inner pivot at the output of the differential/brake unit to its outer pivot at the wheel carrier. The wheel carrier takes the form of a splined stub axle (for knock-off wheels) or a stub axle and hub plate (for 5-lug wheels). In later ...
However, the 10.5" 14-bolt axle remains in production today, specifically utilized in GMC Savana and Chevrolet Express vans. Notably, the 11.5" 14-bolt axle is featured in third-generation Dodge Ram 2500 and 3500 trucks. There are discernible differences between the GM and Ram versions, evident in the gaskets used and the axle cover designs.
1st Generation Dodge Cummins trucks with non-OD transmissions are equipped with 3.07:1 "Dana 61" front axles with unique differential housings and carriers with extra clearance for the very large pinion gear. They can be easily "converted" to 3.54:1 gearing by replacing the carrier. Carrier break: 3.54:1 - 4.10:1 and 4.56:1 - 7.17:1
All Dana 70 rear axles are full floating and typically have a gross axle rating of 7,500 lb (3,400 kg). The Dana 70 rear axle was first used in the Dodge W300 in 1958. The Dana 70 started out using 10 spline pinions and 23 spline axle shafts. The later, more current, Dana 70 axles use 29 spline pinions and 32 or 35 spline axle shafts.
The input torque (i.e. from the engine or transmission) is applied to the differential via the rotating carrier. [8] Pinion pairs are located within the carrier and rotate freely on pins supported by the carrier. The pinion pairs only mesh for the part of their length between the two spur gears, and rotate in opposite directions.
The semi-floating axle setup is commonly used on half-ton and lighter 4×4 trucks in the rear. This setup allows the axle shaft to be the means of propulsion, and also support the weight of the vehicle. The main difference between the full- and semi-floating axle setups is the number of bearings.
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The M939 series uses 11:00 R20 tires with two tires per side per axle in the rear (rear tandem duals). This allows a heavy load to be carried on improved roads and most US trucks in the past have used them. The M939A1 and M939A2 series instead use oversized 14:00 R20 tires with a single tire on each side per axle, still with a tandem setup.