How do Transfer Cases work?
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How do Transfer Cases work? - 1/11/2008 5:06:14 AM
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HummerGuy
Posts: 6673
Status: offline
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Since apparently mine hasn't been working right for months, maybe a year or so now that I see it doesn't fishtail anymore  I have some questions about the T-case.
My first question is does the T-Case ONLY function to transfer power to all 4 wheels, or is it engaged all the time to transfer power to the rear and then when you lock 4WD, it becomes fully active?
When you engage 4WD and all 4 wheels are locked, does that also turn the front differential off?
Also, I always complained that my H3 tires were bad, but now that the t-case is working properly again, it seems it was the power transfer problem the entire time (months) and power is actually going to the front wheels again where there was no power going to them at all unless I locked in 4WD. Now, I can feel the difference dramatically in the snow and rain and no longer have fishtailing or wheel spinning issues.
That being said, does the t-case transfer power to the front wheels ONLY when needed or the rear wheels slip, or is the 60/40 split active all the time? If it is, then it sure wasn't before I got it fixed. That's dissappointing to know it's been like that for months and I didn't know there was a problem.
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RE: How do Transfer Cases work? - 1/11/2008 6:25:48 AM
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Doc Olds
Posts: 3559
Joined: 7/11/2007
From: Boat Town USA (Michigan 48045)
Status: offline
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An AWD T case is always TRANSFERS power from the transmission shaft to a front and rear output shafts. A two speed T case has a Hi and Low set of gears.
All-wheel drive (AWD) is often used to describe a "full time" 4WD that may be used on dry pavement without destroying the drivetrain (It should be noted that "Full-Time" 4WD can be disengaged and the center differential can be locked, essentially turning it into regular 4WD.
AWD can be used on dry pavement because it employs the use of a center differential so to speak (think of it like a series of clutches), which allows each tire to receive different amounts of power. This eliminates driveline binding, wheel hop and other driveline issues associated with the use of 4WD on dry pavement.
When you Lock the H3 T case it becomes a 4WD, and is now locked front to rear 50% - 50%. Hence the O Manual provisions on limits of speed and restristions on use on pavement driving.
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