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watch out! noob questions!


 
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fibulator
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Joined: 31 Jul 2005

PostPosted: Mon Aug 01, 2005 3:30 am    Post subject: watch out! noob questions! Reply with quote

i did read and appreciate the stickied noob section, but i still got some questions...

what the heck is in a transfer case?

what does a differential do?
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Last edited by fibulator on Sun Feb 13, 2011 7:42 am; edited 1 time in total
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Code3TJ
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PostPosted: Mon Aug 01, 2005 10:08 am    Post subject: Reply with quote

Fluid wise or mechanically? Most transfer cases use ATF, but check your manual to be sure. Mechanically, they're either gears or sprokets and a chain. That's very basic, but basically, the input shaft from the transmission, spins a shaft or gear. When it's in 2wd, the rear output (the part that connects to your rear driveshaft) spins at a ratio of 1:1. When you put it into 4hi, the transfer case engages the gears for the front output and now both driveshafts spin at a ratio of 1:1. When you put it into 4lo, it mulitplies the torque coming from the transmission and causes your driveshafts to spin at whatever your low range ratio is i.e. your driveshafts will spin 2 3/4 times every time the transmission output spins once.
Here's an NV242 that's been opened up, courtesy of Swamp Boy.


And here's a good explanation on how differentials work. Basically, they take the torque from the driveshafts, the gears reduce it and transmit it to the tires. If it's an open diff, it allows the tires to turn at different speeds while you're going around a turn (or one of them is stuck, in the air, etc) and if it has a locker, it effectively locks the two axle shafts together.
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ehirner
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PostPosted: Mon Aug 01, 2005 12:56 pm    Post subject: Reply with quote

www.howstuffworks.com
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