Re: Re: What's the difference between FOUR-WHEEL DRIVE and ALL WHEEL DRIVE ???

Posted by Salmoneye on January 29, 2001 at 19:04:52 from (206.27.102.165):

In Reply to: Re: What's the difference between FOUR-WHEEL DRIVE and ALL WHEEL DRIVE ??? posted by Kimk on January 29, 2001 at 17:55:56:

You have crystalized my thoughts!
The only things I could add is that the modern 4WD system has the power go from the engine, through the tranny and into a 'transfer case' (as opposed to a differential) that then transfers the power to the appropriate differential/s depending how the case is engaged.
Modern 4WD has 2WD High (Rear Tires), 4WD High (Front & Rear), and 4WD Low (Front & Rear but with a gear reduction so as to give more torque).
The modern axle differentials are limited slip, which means that the tires can turn independant of each other to some extent, and when one tire loses traction (ie. spins) the other tire just sits there. This is to allow for some differences in tire size and cornering speeds. This is thought to eliminate some of the 'wind up hop' that was referred to above.
This type of 'wind up' was really a problem before the limited slip was in widespread use (ie. early Kaiser/Willys Jeeps). These had axles with no slip and when one tire turned, so did the other.
Hardcore off-road enthusiasts now pay major dollars to install 'lockers' on their differentials in order to make their vehicles be able to have all four tires turn at the same time.
Talk about windup on pavement!!!

:-)

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