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The GM AAM axle tubes exhibit a smaller diameter at the spindle compared to the AAM Dodge axles—measuring 4" for GM and 3.5" for Dodge from the housing. In design variation, newer GM trucks are aligned with Dodge axles. Additionally, GM incorporates a vibration damper on the yoke, while Dodge positions it on the drive shaft.
A variation of the Dana 60 known as a Dana 61 was made to accommodate gear ratios that allowed for better fuel mileage. This was done as a direct result of the 1973 oil crisis. A 3.07:1 gear ratio was common for these axles and unachievable in a regular Dana 60. To allow for the different gearing, the Dana 61 had a greater pinion offset.
The Dana/Spicer Model 80 is an automotive axle manufactured by Dana Holding Corporation and has been used in OEM heavy duty applications by Chevrolet, Dodge, and Ford.It can be identified by its straight axle tubes, 10 bolt asymmetrical cover, and a "80" cast into the housing.
The second overdrive is with ring 2 braked which will cause sun 2 to spin faster than in the first overdrive gear. There is one reverse gear. Ring 1 and ring 3 are braked with the input only connected to sun 1. Sun 1 will drive ring 2 in the forward direction and with carrier 2 braked, sun 2 and sun 3 will spin in reverse.
GM's Automatic Safety Transmission (AST) was a semi-automatic transmission released in 1937. The first mass-produced fully-automatic transmission developed for passenger automobile use was the GM Hydramatic introduced in 1940. [1] The Hydramatic was a big success, and had been installed in the majority of GM models by 1950.
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The reverse unit ring gear was held stationary by the reverse anchor. The driveshaft could still turn to cause the reverse unit sun gear and attached rear unit ring gear to rotate at a very high speed, were it not for the fact that the rear unit ring gear band was now applied by a heavy spring.
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