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Unread 12-06-2007, 04:21 PM   #1
rfoster458
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How Fast is too Fast in 4-wheel drive?

Just a quick question. My wife is driving my 04' TJ that has the automatic overdrive because of bad weather (finally some snow to play in!). She has some highway driving where the road is clear and she doesn't need to be in 4-wheel, except that her driving to get to that point, the road is bad. So she can't really stop to take it out of 4-wheel because she needs it when she gets off of the highway as well. Anyway, let me get to the point. How fast is too fast to drive our 6 cyl. 4 speed auto when it is on the highway and it's in 4-high?

Thanks!

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Unread 12-06-2007, 04:24 PM   #2
BadAddetude
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They say 40 mph, but the way it should be viewed, if you have to have it in 4wd, then you shouldn't be going faster than 25-35 mph. 4wd keeps you in a strait line and gets you going, it doesnt stop it.
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Unread 12-06-2007, 04:33 PM   #3
mrblaine
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Quote:
Originally Posted by BadAddetude
They say 40 mph, but the way it should be viewed, if you have to have it in 4wd, then you shouldn't be going faster than 25-35 mph. 4wd keeps you in a strait line and gets you going, it doesnt stop it.
Who says 40 mph in 4HI? Check the owner's manual and follow it.
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Unread 12-06-2007, 04:34 PM   #4
03silversport
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I have always heard 55 mph.
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Unread 12-06-2007, 04:36 PM   #5
DBLJ
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If you need it then you shouldnt be going fast.
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Unread 12-06-2007, 04:38 PM   #6
rfoster458
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She doesn't need it on the highway, but needs when she exits. The exits are crap and don't get plowed. And I don't have a manual to refer to unfortunately.
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Unread 12-06-2007, 04:40 PM   #7
ChiliPalmer
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I would recommend that she only drive as fast as she feels comfortable with; And she doens't have to stop to take it out of 4wd - the 231 is a shift on the fly TC. I believe the manual says up to 55 mph. So when she gets to the good part of the road all she has to do is push the TC handle forward and she's good to go...
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Unread 12-06-2007, 04:41 PM   #8
mdm
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Quote:
Originally Posted by rfoster458
...she can't really stop to take it out of 4-wheel because she needs it when she gets off of the highway as well...
You don't have to stop the shift between 2Hi and 4Hi. It is an "on the fly" shift. Depending on the year model the manual may say you can make the shift at speeds up to 55 mph or "at any legal speed".
Quote:
Originally Posted by BadAddetude
They say 40 mph,...
Who is "they"? I've not seen this anywhere.
Quote:
Originally Posted by BadAddetude
...if you have to have it in 4wd, then you shouldn't be going faster than 25-35 mph. 4wd keeps you in a strait line and gets you going, it doesnt stop it.
I do pretty much agree with this part. If you need to be in 4Hi because of road conditions your speed should be pretty low.

If you are in road conditions that require you to be shifting in and out of 4Hi on a regular basis your speed should be fairly low. If you are hitting ice/snow patched that require you to be shifting into 4Hi, what are you doing? Driving in 2Hi at 50+ and then slamming into 4Lo and slowing down when you hit the ice/snow? What happens when you don't see it in time because of a hill or curve?
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Unread 12-06-2007, 04:42 PM   #9
rfoster458
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Awesome, thanks! I know the 231 is a shift of the fly TC, but I've always been scared of doing that since I'm used to my old Jeep. Thanks for the info though!
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Unread 12-06-2007, 04:43 PM   #10
Crashnburn80
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Quote:
Originally Posted by Chili Palmer
I would recommend that she only drive as fast as she feels comfortable with; And she doens't have to stop to take it out of 4wd - the 231 is a shift on the fly TC. I believe the manual says up to 55 mph. So when she gets to the good part of the road all she has to do is push the TC handle forward and she's good to go...

Exactly.
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Unread 12-06-2007, 04:46 PM   #11
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Quote:
Originally Posted by rfoster458
How fast is too fast to drive our 6 cyl. 4 speed auto when it is on the highway and it's in 4-high?

Thanks!
Short answer... 0 mph! The 4-wheel drive system in our TJ's need slippage when in 4wd. You do NOT have to stop to go into or out of 4HI. You can go from 2HI to 4HI and back at any legal speed. You do not have to be in nutral either, just let up a little on the gas and pull the lever up to 4HI or down to 2HI.

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Unread 12-06-2007, 04:48 PM   #12
rfoster458
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The highway is completely clear of snow and ice, but the side roads are not. There are people flying by her going like 80 and she asked me how fast she could go while in 4-wheel. I thought 55, but I wasn't for sure, so I thought I would ask. Yes, I understand that if it needs to be in 4-wheel then you shouldn't be going that fast, but humor me here. Thanks for all the input. And why does our 4-wheel need slippage?
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Unread 12-06-2007, 04:51 PM   #13
mdm
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Quote:
Originally Posted by Brian P
Short answer... 0 mph! The 4-wheel drive system in our TJ's need slippage when in 4wd...
Longer question - How far can you drive in 4Hi on pavement before you do damage to the drive train?
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Unread 12-06-2007, 04:52 PM   #14
rfoster458
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That's a good question mdm. I am curious to know that and to know why the TJ needs slippage?
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Unread 12-06-2007, 04:53 PM   #15
Dr. Marneaus
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Quote:
Originally Posted by rfoster458
The highway is completely clear of snow and ice, but the side roads are not. There are people flying by her going like 80 and she asked me how fast she could go while in 4-wheel. I thought 55, but I wasn't for sure, so I thought I would ask. Yes, I understand that if it needs to be in 4-wheel then you shouldn't be going that fast, but humor me here. Thanks for all the input. And why does our 4-wheel need slippage?
it locks the front and rear axles going the same speed, if there is any difference in rotation from the front to the back, all that energy is bound up in the transfer case, if the tires cant slip to release that, then boom, there goes your t-case.

its part time 4wd for a reason, not meant to be used on dry roads.

maybe you should get your wife a grand cherokee, with all-wheel drive.
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