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Can I leave my truck in Full-Time 4WD all winter?

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Old 11-27-2010, 09:17 PM
nottidurango nottidurango is offline
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Question Can I leave my truck in Full-Time 4WD all winter?

My transfer case is the NV242HD. It has 2WD, Part Time 4WD, Full Time 4WD, Neutral, and 4-Low. Two questions:

1) Can I leave it in Full-Time 4WD all winter, even on the freeway too? My truck is tricky to take in and out of 4WD, so if it can't hurt anything I would rather leave it Full-Time 4WD until the snow disappears in March. Most driving will be on wet/dry pavement, but when it snows it will be heavy for a few days, then back to pavement when the snow melts. On and off all winter.

2) Will my gas mileage suffer if I leave it in Full-Time 4WD? My assumption was Full-Time 4WD is actually 2WD until a wheel slips, then it locks in 4WD. So I assume gas mileage wont suffer since most of the time my wheels wont be slipping.

Thanks guys!
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Old 11-27-2010, 09:30 PM
DurangoOwner DurangoOwner is offline
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Don't quote me on this but I am fairly sure that you do not want to drive more than 35-40 mph in 4wd. Also not on firm surfaces.
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Old 11-27-2010, 09:55 PM
sparkmarv sparkmarv is offline
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Thats what ive always been told, no more then 45mph, but id wait for a more reliable source to answer your question.
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Old 11-27-2010, 10:38 PM
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for part time 4wd what has been said above is correct, the full time 4wd option offered on your t-case is similar in practice to AWD in that you can leave it in at all times on dry pavement/wet pavement/snow and it shouldn't hurt anything to leave it there at highway speeds. however your gas mileage WILL suffer doing this since you are splitting power btwn the front and rear axles and you are making the engine DIRECTLY turn more mass (yes the whole driveline turns in 2wd too, but in 4wd there is a connection btwn the engine and the front driveline, in 2wd the front is turned by the front wheels),
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Old 11-27-2010, 11:39 PM
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My transfer case is the NV242HD. It has 2WD, Part Time 4WD, Full Time 4WD, Neutral, and 4-Low. Two questions:

1) Can I leave it in Full-Time 4WD all winter, even on the freeway too? My truck is tricky to take in and out of 4WD, so if it can't hurt anything I would rather leave it Full-Time 4WD until the snow disappears in March. Most driving will be on wet/dry pavement, but when it snows it will be heavy for a few days, then back to pavement when the snow melts. On and off all winter.

NO, you should not drive in 4HI all the time. You can ware out the Viscous Coupler and blow the T-case.

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2) Will my gas mileage suffer if I leave it in Full-Time 4WD? My assumption was Full-Time 4WD is actually 2WD until a wheel slips, then it locks in 4WD. So I assume gas mileage wont suffer since most of the time my wheels wont be slipping.
Yes your gas mileage will suffer.

Your assumption is incorrect. Don't do it! Torque can move between front and rear, but it usually moves more to the slip point than the grip, however it will also move through the Viscous Coupler. This is not something that should be used all the time. You are going to have to get used to only locking in the 4X4 when you NEED it and not when it's just a little slick.
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Old 11-28-2010, 01:21 AM
nottidurango nottidurango is offline
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Thanks so much for both your inputs, but I am getting two different answers... anyone may be able to explain which answer is best, in detail. It would be really nice to leave it in Full-Time 4WD, but I do not want to do it if it is going to wear anything out. Thanks again, you both are a big help around here.
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Old 11-28-2010, 11:02 AM
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notti, Just my 2 cents, I would not leave it in 4 wd all winter. Bad for mpg's, bad for drivetrain, bad for truck in general. The switch in right in right in front of you so just switch it in and out of 4wd when you need it, otherwise always leave it 2wd. A flip of the 4wd switch is a whole lot cheaper than replacing a transfer case or a transmission, even if it takes a minute or two to get it to shift the t-case. I would rather take the extra time than chance busting something in the driveline.
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Old 11-28-2010, 03:29 PM
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im not going to lie, im not 100% familiar with your transfer case, hydra owned a truck which had the case in it iirc, so trust him on it, all our trucks have had part time 4wd 2wd and 4 lo so i went w/ my gut and was apparently wrong
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Old 11-29-2010, 09:17 AM
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Our Ds were made for 2wd primarily. That's why we have the switch in the cabin. Personally, I would not leave it in 4wd hi all the time. Like duram and others have said, just use the switch when you need 4wd. Just my .02.
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Old 11-29-2010, 10:17 AM
1999_Durango_SLT 1999_Durango_SLT is offline
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I use mainly 2WD. If I start slipping in that I throw it in 4 WD PT, If I need better traction than that I throw it in 4 WD FT pulling over each time putting the drive in Neutral to pop it in the four wheel drives. If there is snow/ice really bad on the road I just slap it in 4 WD FT and go on for the day then when I am done running around paying bills or shopping I put it back into 2 WD. I think this is the same that Hydra said to do as well more less.
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Old 11-29-2010, 03:30 PM
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yea close to the same as hydra said, but you got the pt and ft backwards i believe, pt gives you better traction than ft does. and also, just so you know, you do NOT have to stop and shift into neutral to go into 4hi or 4ft, you can do that at a roll at speeds under (i believe) 30, i usually just let it coast while making the switch, but the neutral pause is only necessary for 4lo (maybe save you some time next time you need it)
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Old 11-29-2010, 03:37 PM
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anyone may be able to explain which answer is best, in detail.


I had the NV242HD case and understand it entirely. Do not use 4X4 unless you need it.

Quote:
Originally Posted by 1999_Durango_SLT View Post
I use mainly 2WD. If I start slipping in that I throw it in 4 WD PT, If I need better traction than that I throw it in 4 WD FT pulling over each time putting the drive in Neutral to pop it in the four wheel drives. If there is snow/ice really bad on the road I just slap it in 4 WD FT and go on for the day then when I am done running around paying bills or shopping I put it back into 2 WD. I think this is the same that Hydra said to do as well more less.


You my friend are miss-informed!

You have the NV242HD Transfer Case as well. The 4X4 PT is only for that PART TIME! Do not use this ever unless you HAVE to have MAXIMUM traction. The PT stands for Part Time and thus you are supposed to use it only when need, not when you just start to slip, that is what 4 FT is for.

4X4 FT is the normal 4X4 selection you should be using on slightly slippery road conditions. This is good for all conditions including switching from dry to loose surfaces.

If you use the 4 PT selection for all conditions you are winding up your Transfer Case and differentials and you will blow your case and or other drive train components. The reason is that in 4 PT the drive lines are LOCKED and if you turn, the front moves more rotations that the rear causing the wind up (Axle Bind). This is what happens to people that use the 4PT on conditions that are semi slippery or dry. Can you say EXPLODE? http://dodgeforum.com/forum/1st-gen-...-exploded.html

Look at the sun visor in the driver’s side and even it will tell you how to use your Transfer Case!


Quote:
our trucks have had part time 4wd 2wd and 4 lo so i went w/ my gut and was apparently wrong
This is correct as all the Transfer Cases are considered "Part Time" except the AWD case. The difference between the hi-bred NV242HD cases is that it actually has 5 different settings not 4.

NV242HD
2WD
4PT
4WD
Neutral
4LOW

NV133
2WD
4Hi

NV231
2WD
4WD
Neutral
4LOW

NV241
2WD
4WD
Neutral
4LOW

NV244 (AWD Case)
AWD
Neutral
4LOW

By definition, a Transfer Case that operates in regular 2WD and has the ability to run in 4X4 by driver switching is technically a "Part Time" transfer case. The difference between those and the NV242HD case is that it actually has an additional 4PT selection, where all other cases just the normal selections.

So yes, you are correct Sharps, but with a slight miss-understanding.
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Old 11-29-2010, 03:48 PM
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apparently thats what i get for posting at 2300 after a day of cutting/hauling firewood . . .
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Old 11-29-2010, 03:48 PM
 
 
 
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