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Old 01-23-2014, 09:39 AM   #1
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4W High

How fast can you safely drive in 4WH? I ask because my side streets are terrible but main roads are clear and I'd rather not shift back and forth if I don't have to.

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Old 01-23-2014, 09:48 AM   #2
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I know on the TJs the OM states we can operate the Wrangler in 4H up to 55 MPH. I'd imagine the JKs are similar.

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Old 01-23-2014, 09:54 AM   #3
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Originally Posted by CarloDiMarco View Post
How fast can you safely drive in 4WH? I ask because my side streets are terrible but main roads are clear and I'd rather not shift back and forth if I don't have to.
You can drive as fast as you dare in 4 high.

If the main roads are clear then shift back into 2 high. It takes little to no effort and driving in 4 high (or low) on clear roads will damage your Jeep. Your transfer case and drive shafts will thank you.
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Old 01-23-2014, 10:05 AM   #4
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As fast as conditions allow....

Just keep in mind that 4WD does not make one invincible.
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Old 01-23-2014, 10:43 AM   #5
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You can drive as fast as you dare in 4 high.

If the main roads are clear then shift back into 2 high. It takes little to no effort and driving in 4 high (or low) on clear roads will damage your Jeep. Your transfer case and drive shafts will thank you.
X2. It really is a minimal effort. I can't understand why you wouldn't.
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Old 01-23-2014, 10:46 AM   #6
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I always get very nervous switching in and out of 4wd while driving... my TJ almost felt like the drive shaft blew up once when i did it
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Old 01-23-2014, 10:50 AM   #7
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They call it shift on the fly for a reason. You can go in and out of 4H with no ill effects.
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Old 01-23-2014, 10:58 AM   #8
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They call it shift on the fly for a reason. You can go in and out of 4H with no ill effects.

So if you're driving regularly and want to go into 4H or vice versa, do you just put it in neutral (while moving) then shift into 4WD?
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Old 01-23-2014, 11:01 AM   #9
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2WD and 4-Hi are super easy to shift between while driving. 4Hi to 4Lo not as much, needing to be in neutral and only supposed to be going at ~2-3MPH


You only need to be in neutral to shift between 4hi and 4lo, you can shift between 2WD and 4hi while in gear
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Old 01-23-2014, 11:07 AM   #10
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So if you're driving regularly and want to go into 4H or vice versa, do you just put it in neutral (while moving) then shift into 4WD?
no need to put it in neutral just pull back on the transfer case lever and it slides right in up to about 60mph

give it a try on a side street where there is no traffic so you get the feel of it and you will go dang this is too easy lol.
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Old 01-23-2014, 11:19 AM   #11
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neutral is not necessary, but letting off the gas while shifting will make it easier.
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Old 01-23-2014, 11:39 AM   #12
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OK, cool so I can be going up to 60 mph and go in and out of 4H?
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Old 01-23-2014, 11:43 AM   #13
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I brain-farted one day last week and left mine in on the interstate at 60... certainly would never do it on purpose but don't think any damage done.
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Old 01-23-2014, 11:47 AM   #14
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I shift in and out of 4 Hi many time a day going to work in the snow. Just let of the gas and reach down and pull or push the lever. If it does not go smoothly then there is a problem. If you are OFF the gas you should not have any handling issues. i do not understand why you would be leary about using the "Shift on the Fly" system?
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Old 01-23-2014, 11:49 AM   #15
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I tried going from 2wd to 4wd high on pavement on a long straight away. I didn't even feel a change. The only way that I knew it was in 4wd was the light on the dash and the fact that I pulled the lever...
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Old 01-23-2014, 11:55 AM   #16
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OK, cool so I can be going up to 60 mph and go in and out of 4H?
I would not go from 2wd to 4hi on dri pavement going that fast but have many times on snow packed roads. No issues at all going the other way.
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Old 01-23-2014, 12:04 PM   #17
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Old 01-23-2014, 12:59 PM   #18
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Old 01-23-2014, 01:09 PM   #19
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Thank you. I had no idea you could shift on the fly. I thought you needed to be stopped and in park. Appreciate the discussion.
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Old 01-23-2014, 01:11 PM   #20
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The gear ratio from 2WD from 4WD is 1:1 so so shifting out of 4wd at any speed is fine--I usually let up on the gas and shift out of 4wd just to unload the drive train. The owners manual says it is ok to shift from 2wd to 4wd at any speed below 50 mph. I let up on the gas and shift into 4wd. The most importing thing when shifting into 4wd reguardless of the speed is to ensure you are not spinning the rear tires when you shift into 4wd because it will "slam" the front end in 4WD since the front tires and rear tires will be spinning at a different speeds.
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Old 01-23-2014, 01:16 PM   #21
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Thank you. I had no idea you could shift on the fly. I thought you needed to be stopped and in park. Appreciate the discussion.
Your avatar explains why you didn'y know that. You couldn't do that in the old days! I would strongly advise downloading the owners manual from www.jeep.com and reviewing the 4WD section. There is lots of good information there.
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Old 01-23-2014, 04:24 PM   #22
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OK, cool so I can be going up to 60 mph and go in and out of 4H?
I think the book indicates 55, at least it used to, but if you can safely travel approx. 50 mph I don't see why it would be needed.
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Old 01-23-2014, 04:26 PM   #23
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Your avatar explains why you didn'y know that. You couldn't do that in the old days! I would strongly advise downloading the owners manual from www.jeep.com and reviewing the 4WD section. There is lots of good information there.
I think this says it best, especially for using 4L if you have to.
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Old 01-23-2014, 04:34 PM   #24
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My offroading is 'light' so I switch back and forth from 4wd to 2wd a lot. No issues. Like others have said just don't force it. Stop and retry if you feel something funny.
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Old 01-23-2014, 05:07 PM   #25
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Keeps annoying me that one could be 'surprised' by, for example, black ice in a curve and having the jeep in 2wd. Clearly one would be way too slow in putting the jeep in 4hi.
Living in the Alps the road conditions vary highly in just a couple hundred of meters due to wind or sun exposed area's and difference in height.

I do not mind my full time 4wd Land Rover these days to be honoust...
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Old 01-23-2014, 05:14 PM   #26
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4WD is of no use on black ice.
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Old 01-23-2014, 05:26 PM   #27
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Touché....
But I hope you got the essence of my comment
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Old 01-23-2014, 05:48 PM   #28
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4WD is of no use on black ice.
only to make you drive faster than you should!!
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Old 01-23-2014, 06:42 PM   #29
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Originally Posted by rdg04578 View Post
The gear ratio from 2WD from 4WD is 1:1 so so shifting out of 4wd at any speed is fine--I usually let up on the gas and shift out of 4wd just to unload the drive train. The owners manual says it is ok to shift from 2wd to 4wd at any speed below 50 mph. I let up on the gas and shift into 4wd. The most importing thing when shifting into 4wd reguardless of the speed is to ensure you are not spinning the rear tires when you shift into 4wd because it will "slam" the front end in 4WD since the front tires and rear tires will be spinning at a different speeds.
Not exactly. The important thing to remember is that you don't want to shift back and forth when there is a large differential of speed/traction front to back or even side to side for that matter. This is a part time 4WD system. Speed isn't a factor as long traction/speed is uniform across all wheels. This is usually the condition when not turning. Unloading the the drivetrain as much as possible by easing up on the gas is also great advice.
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Old 01-23-2014, 09:24 PM   #30
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Thank you. I had no idea you could shift on the fly. I thought you needed to be stopped and in park. Appreciate the discussion.
Here's what it says in the 2013 owner's guide:

Shifting between 2H and 4H can be
made with the vehicle stopped or in
motion. Shift the transfer case lever
firmly to 4H at any speed up to 50 mph
(80 km/h).


As far as how fast you can drive in 4H, you can go as fast as you can in 2H.

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