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Post by spiked3cylinder on Dec 12, 2009 2:27:18 GMT -5
This may be a rather ignorant question and partially due to my misunderstanding of this awesome vehicles 4wd set-up. But, during an uphill battle with packed snow (creating an ice-effect) in 1st gear - I got stuck!!! I noticed only, the rear wheels were spinning....
Why are not all wheels attempting to spin in this situation. OR rather, why don't the wheels that aren't spinning, GRIP and get me up the hill??
Prior thanks to your explanation.
Adam
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Post by RedRooJusty on Dec 12, 2009 4:06:31 GMT -5
**spiked3cylinder** this is not a bad question at all. I don't think you have a worry if the car drives fine on traction surfaces in FWD.
In 4WD both of your diffs are open (not limited slip, not locked). So even though in 4WD you have a front to rear "locked" 50/50 power distribution, the individual open diffs can still allow side-to-side wheel slip. You probably didn't notice the the spinning front wheel on the other side. Remember that you have a bit more weight over the front wheels as well, so the rear wheels loosing traction first is to be expected.
Most "crawling" 4x4's have to lock the diffs to overcome this issue.
Does this make sense? I think all is well -RRJ
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Post by Raw Justyce! on Dec 12, 2009 16:48:06 GMT -5
RRJ is right on the money for this one.
When you are in 2x4 mode: there is power available to 2 out of 4 wheels (in our case the two front wheels), but there will only be power going to one wheel. In 4x4 mode: all wheels have the opportunity to be powered, but only 2 (one in the front, and one in the rear) will be spinning at any given time in a stock 4x4 system.
This is an over simplification, but hopefully it helps to illustrate the explanation for you.
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Post by spiked3cylinder on Dec 23, 2009 18:31:08 GMT -5
Gentlemen to the North,
I appreciate your responses, very clear indeed. I realize now, after more snow drifting and mountain cruising what you are writing about. Sounds good to me.
BTW, seems as though the Justy is popular up there in Oregon?? Love that state!
Thank you, Adam
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