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In rear-wheel drive cars and trucks, the engine turns a driveshaft (also called a propeller shaft or tailshaft) which transmits the rotational force to a drive axle at the rear of the vehicle. The drive axle may be a live axle, but modern rear-wheel drive automobiles generally use a split axle with a differential. In this case, one half-axle or ...
Distinguishing it from the GM 14-bolt 9.5-inch ring gear rear differential is the latter's utilization of C-clips to retain axles, differing from the free-floating axle mechanism of its heavy-duty counterpart.
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.
An epicyclic differential uses epicyclic gearing to send certain proportions of torque to the front axle and the rear axle in an all-wheel drive vehicle. [citation needed] An advantage of the epicyclic design is that it is relatively compact width (when viewed along the axis of its input shaft). [citation needed]
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.
It can be identified by its straight axle tubes, 10 bolt asymmetrical cover, and a "80" cast into the housing. Dana 80's are made as full floating, rear axles only and are a step up in overall strength compared to the Dana 70. 1988 Ford was the first company to use the Dana 80.
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