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The microprocessor would review input from sensors every 20 milliseconds and decide if the front axle needed more torque. Using this technique, the unit's computer watched for drive wheel slip. If it sensed as little as half an rpm difference between the front and rear axles, it sent a power signal to the multi-disc clutch.
This correction enables a larger maximum permissible air gap at the speed sensor. On a module m = 1 target wheel these new sensors can tolerate an air gap of 1.4 mm, which is wider than that for conventional speed sensors on module m = 2 target wheels. On a module m = 2 target wheel the new speed sensors can tolerate gap of as much as 2.2 mm.
The speed sensor for the rear wheels is located in the rear axle. This system provides individual control of the front wheels, so they can both achieve maximum braking force. The rear wheels, however, are monitored together; they both have to start to lock up before the ABS will activate on the rear.
The predecessor of modern electronic traction control systems can be found in high-torque, high-power rear-wheel-drive cars as a limited slip differential.A limited-slip differential is a purely mechanical system that transfers a relatively small amount of power to the non-slipping wheel, while still allowing some wheel spin to occur.
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.
The Dana 70 front drive axles used in the Chevrolet Kodiaks and GMC Topkicks also had these features. This axle was standard for the Big Three (automobile manufacturers) dual rear wheel trucks until 1985, when Ford started using the Sterling 10.25 rear axle. However Ford still kept the Dana 70HD an option until the Dana 80 was made available ...
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