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Binding 4x4 on pavement question

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Old 11-04-2010, 09:50 AM   #1
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Binding 4x4 on pavement question

I have a TRD Off-Road. I know you're not supposed to use 4x4 on dry pavement.

I'm just wondering why it binds? My understanding is the front is an open differential. Why would it react differently than the rear axle where the wheels turn at a different rate when in a turn?
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Old 11-04-2010, 09:52 AM   #2
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I'm pretty sure it's the transfer case that doesn't allow it. The mechanics of it escapes me ATM.
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Old 11-04-2010, 09:55 AM   #3
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Because you will have two wheels (one front right, one rear left IIRC) that will be spinning at the same rate.
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Old 11-04-2010, 10:02 AM   #5
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The bind is not left to right but front to back as I understand it. You are right- The open diff allows the drivers and passenger sides to spin at different speeds. But there is no inter-axle differential...so the tires need some latitude to slip when both the front and rear diffs are tied together.
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Old 11-04-2010, 10:05 AM   #6
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Quote:
Originally Posted by OffroadToy View Post
Cool, thanks everyone. I thought it was a left-right bind issue but it's a front-back bind.

From the article:
The transfer case on a part-time four-wheel-drive system locks the front-axle driveshaft to the rear-axle driveshaft, so the wheels are forced to spin at the same speed. This requires that the tires slip when the car goes around a turn. Part-time systems like this should only be used in low -traction situations in which it is relatively easy for the tires to slip. On dry concrete, it is not easy for the tires to slip, so the four-wheel drive should be disengaged in order to avoid jerky turns and extra wear on the tires and drivetrain.
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Old 11-04-2010, 10:12 AM   #7
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Old 11-04-2010, 10:05 PM   #8
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Full time 4WD or AWD has a third differential that allows the front and rear driveshafts to rotate at different speeds= no binding. Off road rigs with full time systems have a differential lock-out for serious off roading where you want an even split between the front and back driveshafts... AWDs that don't have the center differential locker have unequal split of power to the front and rear.

(yes, I know it all is in that great link.. I just like typing it out )
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Old 11-05-2010, 06:22 AM   #9
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power goes 50/50 front and rear but the axles follow 2 different paths on a corner. the front axle will be out wider than the rear axle if you hold a turn and look. That is essentially 4 different diameter turns for 4 different tires. With more traction pavement allows stress builds until released......hop hop hop This getscompunded with locked diff. that wont allow left /right speed differences. Mine has 2 open diffs , the bind comes from a fron and a rear tire with the most traction ... one releases eventually.
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Old 11-06-2010, 06:56 AM   #11
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Just wondering if you put it in 4WD on pavement and turned or backed up and turned will it wreck anything?
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Old 11-06-2010, 08:05 AM   #13
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Quote:
Originally Posted by Lewman View Post
Just wondering if you put it in 4WD on pavement and turned or backed up and turned will it wreck anything?
If you did it a little bit it probably wouldn't hurt it but it's definitely not good for it as it puts a lot of strain on the drivetrain.
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Old 11-06-2010, 10:32 AM   #14
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Dont turn sharp in 4wd on pavement. Switch to 2wd for that.
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Old 11-06-2010, 10:51 AM   #15
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Quote:
Originally Posted by Lewman View Post
Just wondering if you put it in 4WD on pavement and turned or backed up and turned will it wreck anything?
Personally I would never have the 4wd engaged on pavement (except snow or ice.) If you feel the need just be careful and make very gradual turns...
http://www.4x4abc.com/4WD101/axle-wind-up.html

http://www.4x4abc.com/4WD101/def_turnpart.html
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Old 11-06-2010, 11:29 AM   #16
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Guys... 4WD is for when 2WD won't drive you any further.. at least for off the dry pavement. Since turning your truck on dry pavement does not require 4WD, that is a good indicator to not put it in 4WD. It is so difficult to turn a truck around on dirt in 4WD, I put it in 2WD when steering is difficult.
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Old 11-06-2010, 11:33 AM   #17
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[quote=OffroadToy;2358969]Personally I would never have the 4wd engaged on pavement (except snow or ice.) If you feel the need just be careful and make very gradual turns...
http://www.4x4abc.com/4WD101/axle-wind-up.html

http://www.4x4abc.com/4WD101/def_turnpart.html[/quote]

Very good link!:
http://www.4x4abc.com/4WD101/def_turnpart.html
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Old 12-28-2010, 08:36 AM   #18
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Clearly the Tacoma 4WD should only be engaged on slippery surfaces, not on dry pavement. What I find amazing is that Neither the 2010 manual nor the dealer tells you this. Particularly when the manual directs you to drive in H4 for 10 miles once a month to lubricate the system, they should advise that you should only do this while driving in a straight line or off road, preferably both.

The way the manual reads, you'd think it is no big deal to drive in 4WD mode whenever you feel like it.
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Old 12-28-2010, 08:53 AM   #19
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Quote:
Originally Posted by DanT View Post
Clearly the Tacoma 4WD should only be engaged on slippery surfaces, not on dry pavement. What I find amazing is that Neither the 2010 manual nor the dealer tells you this. Particularly when the manual directs you to drive in H4 for 10 miles once a month to lubricate the system, they should advise that you should only do this while driving in a straight line or off road, preferably both.

The way the manual reads, you'd think it is no big deal to drive in 4WD mode whenever you feel like it.
As soon as you try to steer in 4WD, on dry pavement, you will know you shouldn't be in 4WD! If it is hard to do, then find an easier way!
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Old 12-28-2010, 09:37 AM   #20
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My 4wd use is mostly when driving in the snow. And I LOVE the challenge of "can I make this in 2wd???" I enjoy challenging my truck and quietly beat my chest when I make it in 2wd. But if I am stopped and can no longer move forward in 2wd, I switch to 4wd and usually ease right through it (or up it).

The problem is when you are tracking on something that requires 4wd and forget to switch back to 2wd when you reach pavement. Of course you will know it when you try to turn but...its not good for the drivetrain.
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