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post #1 of (permalink) Old 07-29-2003, 01:46 AM
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Properly Engaging 4 Wheel H/L?

I'm takin' off work tomorrow to do some off-roading at my step bro's Grandpa's farm. From what it sounds like, we'll be going up and down a trail, maybe some other stuff. Can anyone offer some advice on the usage of 4 H/L? Should I follow Jeep.com's directions for engaging 4 H/L?

According to Jeep.com you can be going up to 55 MPH, while shifting into 4 High. Only use it on slippery or loose surfaces.

For 4 Lo, Jeep suggests that you slow down to 2-3 MPH, put it in neutral, engage 4 Lo, then return the transmission to desired gear. Use for severe off-roading.

Is this info specifically for the TJ's only, or does it apply for the YJ as well? If so, that would answer my question, do YJ's have 'Command Trac'.

Is there a common mistake that most people make when engaging 4 wheel drive? Anything that could potentially break the axles, transfer case, or transmission? If I turn off the Jeep, leave it in 4 High or Lo, then start it back up again, can I just drive away or do I need to put it back into 2 Hi?

Thanks for answering my idiotic questions! [img]images/graemlins/grin.gif[/img] [img]images/graemlins/blush.gif[/img]
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post #2 of (permalink) Old 07-29-2003, 02:49 AM
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Re: Properly Engaging 4 Wheel H/L?

Good questions man, sorry i can't offer any answers, as I would like to hear them as well!!! [img]images/graemlins/tongue.gif[/img]
-Nick
post #3 of (permalink) Old 07-29-2003, 03:10 AM
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Re: Properly Engaging 4 Wheel H/L?

YJ's aren't new and weren't designed to be "shift on the fly" machines. IF POSSIBLE, stop before putting it in 4wd. Not that you'll hurt anything by grabbing 4 hi while moving, but it is easier on the equipment. If you have to stay moving, be patient, and wait for the t-case to slide into gear instead of forcing it. The only motion I would recoment when going from Hi range to low range would be just enough to get the t-case to engage. If it will go into 4 Lo at rest, then shift it at rest. Other wise let the vehicle roll a little until it engages. You can start and stop in whatever you have the t-case in (4 HI, LO, or 2wd), but I don't recomend doing your daily driving in 4wd as it puts more wear and tear on the front driveline.

Have fun wheelin' and let us know how it went [img]images/graemlins/grin.gif[/img]
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post #4 of (permalink) Old 07-29-2003, 07:48 AM
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Re: Properly Engaging 4 Wheel H/L?

To add to Generals info...my NP231 kinda likes to be engaged while rolling...I stop so that the Jeep will roll FORWARD when I let off the brake, then pull the shifter...I have the tranny in neutral.

If your off-roading will be just across fields and the like you will likely do just as well to leave it in 2wd then shift when you think your not getting enough grip from the rears.

This is also an excellent oportunity to see just how your Jeep drives in 4lo. Drop it down and see how differently it acts and reacts...have fun

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post #5 of (permalink) Old 07-29-2003, 08:41 AM
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Re: Properly Engaging 4 Wheel H/L?

Ive got the same nv231 transfer case in my tj, and it reacts the same way. You have to be rolling slowly in neutral to engage 4 low. My transfer case is a bugger to get out of 4 low and doesnt like to be babied about it. It comes out the same way but likes it to be done quickly. Otherwise it decides to do some grinding. 4 hi is a piece of cake. I can be driving "althouth ive never tried this above about 10mph" and just take it in and out of 4 hi without any trouble.
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post #6 of (permalink) Old 07-29-2003, 10:26 AM
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Re: Properly Engaging 4 Wheel H/L?

I'll echo Neuro. When engaging 4LO you roll slow ...just enough to get the mechanics spinning ..and engage the shifter in a swift and assertive manner. It'll engage with a mild "chink" or "clunk". If you do it too slow or too wimpy ..it will just grind away for a bit.

Do it once or twice and you'll be a master 4LO engage artiste~ [img]images/graemlins/grin.gif[/img] Find a piece of gravel or turf that you can practice this a couple of times before your ride.
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post #7 of (permalink) Old 07-29-2003, 02:21 PM
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Re: Properly Engaging 4 Wheel H/L?

Unless your getting into rocks and mid to deep mud you probably can keep it in 2 hi. Otherwise use 4 lo for the most part it saves a lot of ware and tear on yor clutch.(I learned this lesson the hard way) If you shut th vehicle off in 4wd yes you still have to shift it back into 2 hi it will not disengage itself it is not an electronic or push button system in anyway. It must be changed manually.
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post #8 of (permalink) Old 07-29-2003, 03:18 PM
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Re: Properly Engaging 4 Wheel H/L?

If you have a manual transmission... I didn't check your profile. Sometimes hitting the cluch makes things easier; although I believe not necessary. I like to get the transmission out of the equation while looking for 4 hi. I shift on the fly to 4 hi. 4 lo. I stop because I'm not really sure where 2-3mph is. I think that pretty much says stop.
The lever should just go in smoothly. Don't force anything.
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