|06-21-2013 02:50 AM|
|MikeK46||I had 4WD engaged for literally 10 feet on dry pavement while turning the wheel, and it bound up & my steering went out of alignment...Jeep was pulling to one side & steering had to be adjusted.|
|06-20-2013 05:47 PM|
|06-20-2013 04:33 PM|
|06-20-2013 01:29 PM|
|06-20-2013 01:23 PM|
|sevenservices||The full time your thinking of may be on some grand cherokee's, thats how our durango r/t is. Its all wheel drive basically w/limited slip to each tire. Then you have the option for 4-highlock and 4-lowlock which changes the gearing and engages the lockers in the front and rear difs. Some traction systems have a lot of options as well. If you have an owners manual see what it says about your specific model.|
|06-20-2013 01:15 PM|
|06-20-2013 01:09 PM|
The front driveshaft on the JK is always turning when you're driving. This makes the chain inside the case move, pushing fluid around everywhere, along with the rest of the parts moving.
In older 4x4 trucks with manual locking hubs you can unlock the hubs and in 2WD, the front shaft doesn't turn. In my J10 I have an NP208 (predecessor to the NP231/241) and lock out hubs. My chain doesn't move much when I have that in 2WD and unlocked hubs. You get some fluid moving around but not as much. It's more important in that truck to run in 4WD once in a while to make sure things get moved around and properly lubricated.
That being said, it's never a bad idea to head out to a dirt road somewhere once a month or so and throw it in 4HI (and even 4LO) for a couple of miles just to make sure everything still works and checks out.
|06-20-2013 12:36 PM|
|Plasticpirogue||My brother (mechanical engineer and heck of a good mechanic) recommended that I "exercise" the 4WD from time to time. Reason: splashes fresh, warm lube on all of the seals, fully soaks all of the moving parts, prevents sludge buildup, and "flexes" all of the linkages. It also helps to insure that the system works as designed when you really do need it and reach for the selector lever, yank on it, and nothing happens. I just pop mine into 4H on dirt and gravel roads every weekend when I am headed out fishing.|
|06-20-2013 12:12 PM|
|06-20-2013 11:55 AM|
|06-20-2013 11:51 AM|
I have a 2012 4 runner SR5 with part time 4wd. Toyota recommends that the 4H be engaged for at least 10 miles/month in order to keep the gears lubricated.
Why is the JK different?
|06-20-2013 11:41 AM|
Bascically....unless you wheels can "slip", don't engage 4WD.
When you are in 4WD, your front and rear axles are locked together...and even with differentials in each pumpkin, one front wheel and one rear wheel have to rotate at the exact same speed. Not so much an issue when going in s straight line...but when you make a turn, all 4 wheels rotate at different speeds....if two of the wheels (one front and one rear) are locked together, you get binding when on dry pavement because one wheel is trying to turn at a differnt speed than the other, but they are locked together.
JK's have Command-trac...which is part-time 4WD. Part time because it can only be used part of the time.
I had Selec-trac in my old Libby, which had a full-time mode. Since it had a center differential, I could leave it in 4WD on any pavement. The center differential allowed the "locked" wheels to rotate at different speeds.
|06-20-2013 10:49 AM|
|64Chevy||I was taught in the 4WD course I took (that used Jeep Rubis, but the way) to always put it in 4WD when you hit the dirt. That way you don't get surprised or forget. This is when you are actually going wheeling, and not (of course) necessary on well maintained dirt roads, etc.|
|06-20-2013 09:41 AM|
Of course one should be cognative of their speed, and full time 4WD is a superior choice, but don't be scared of using your part time system when it can be of benefit.
|06-19-2013 11:44 PM|
|06-19-2013 11:34 PM|
|06-19-2013 11:29 PM|
|06-19-2013 11:19 PM|
|06-19-2013 10:44 PM|
I actually find that I need 4H pretty often in the winter where I live- even if there is only an inch or two of snow on the road I can hit patches of slush and packed snow that require 4x4 even though it's paved road that is not necessarily completely covered. I know what you all are getting at- 4 wheel drive is something to be used when needed and disengaged as soon as it's no longer needed- but even here in northern CT we get enough snow and sleet that I have to engage 4H pretty regularly. Once I hit the main roads in town I'm always fine in 2wd though.
Note: I live in a very rural, hilly area with very old and winding roads which are plowed by independent contractors (i.e. kids with Silverados)
|06-19-2013 06:32 PM|
"Hold on, hold on. I am going to do a donut too! I just have to remember to hit this silly button!"
|06-19-2013 06:24 PM|
|06-19-2013 04:42 PM|
For instance, if you were on ice with all four wheels having the same lack of traction, all four wheels would spin.
The issue is if one front and one rear wheel is on ice and the other two are on pavement. The torque will be applied to the wheel/s with the least resistance. Traction control, BLD, and LSD help combat this and generally do a good job, as it's rare to have 0% friction.
That's why rock crawlers want lockers, as they frequently have one or two wheels off the ground. Without lockers, if you had one front and rear wheel off the ground, those wheels would simply spin and you couldn't move.
|06-19-2013 02:33 PM|
Yea, I guess my wording is a little jacked.
I guess I meant 4 wheels are "driven", "powered".....well ya know what I mean.
|06-19-2013 02:28 PM|
Yes, I know what you meant.
|06-19-2013 02:17 PM|
A lot of people also forget that not all 4 wheels are turning in most 4x4's, even in a Jeep. More like one front and one rear.
Unless you have lockers. Love me some Lockers....."The Saviors Savior"
|06-19-2013 02:12 PM|
|Kennyksu||Also, remember that not being in 4wd in your Wrangler means that you are in RWD. For folks not used to RWD in slick stuff, it can feel a bit hairy when you see your back end starting to pass you. Easy on the gas until you've slid around a bit and know how to recover.|
|06-19-2013 12:59 PM|
most people dont realize just what you can do with 2wd; 4wd isn't some sort of savior setting, you need it alot less then you think you do. on pavement you pretty much just dont need it, unless as mentioned above, its covered in slush/ice/snow or mud or standing water, etc.
Now, having said that, the tires you choose will also help/hurt how much you maintain traction, so make sure you're choosing an appropriate tire to the conditions, not just the biggest knobbiest mud tire you can find.
|06-19-2013 10:43 AM|
Turn on dry pavement with 4x4 engaged will make your JK hop and bounce like crazy.
|06-19-2013 10:32 AM|
|panthermark||Ivory and derf were spot on.... Wrangler's do not have a center differential, so you cannot run 4WD on dry pavement (unless you are going in a perfectly straight line....which would make no sense little sense to use 4WD). Use 4WD for deep mud, snow, and off-roading.|
|06-19-2013 10:26 AM|
|ToothDoc||I'm surprised at what mine will go through in 2 wheel drive!|
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