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The Dana 44 rear axle first saw use in the 1940s and is still in use today. The Dana 44 has a GAWR up to 3,500 lb (1,600 kg) and is a semi-floating type, having one bearing on the end of the axle shaft which carries the weight of the vehicle on the axle and also allows axle rotation.
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.
Gross Axle Weight Rating (GAWR) 6500 lbs (full float, rear axle) 5500 lbs (semi float) GAWR is vehicle axle weight plus rated payload capacity; Ring gear diameter: 9 3 ⁄ 4 " Axle shaft diameter 1.41” Front (32 spline) 1.46” Rear (32 spline) 1.50” Front (35 spline) 1.50” Rear (35 spline) Inner axle shaft splines: 16, 23, 30, 32, 33 or 35
The axle tubes were increased to 4 inches (100 mm) diameter and carrier bearings were larger and thicker, the axle shafts were 35 spline only. These upgrades gave the Dana 70HD a gross axle rating of 10,000 lb (4,500 kg). The Dana 70 front drive axles used in the Chevrolet Kodiaks and GMC Topkicks also had these features.
The Dana 80 Trac Lok is unique being it is a 4 pinion unit, unlike other Dana Trac Lok units with 2 pinions. This was the only rear axle available for the 2nd generation Dodge Ram 3500 trucks. [2] 35 Spline Dana 80 in a 2002 Dodge 2500HD Diesel
The axle load of a wheeled vehicle is the total weight bearing on the roadway for all wheels connected to a given axle.Axle load is an important design consideration in the engineering of roadways and railways, as both are designed to tolerate a maximum weight-per-axle (axle load); exceeding the maximum rated axle load will cause damage to the roadway or railway tracks.
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. The semi-floating axle features only one bearing, while the full-floating assembly has bearings on both the inside and outside of the wheel hub.
As the wheel and axle system rotates around its bearings, points on the circumference, or edge, of the wheel move faster than points on the circumference, or edge, of the axle. Therefore, a force applied to the edge of the wheel must be less than the force applied to the edge of the axle, because power is the product of force and velocity. [17]
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