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Old 06-14-2014, 03:32 PM   #1
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Using 4wd question

So i went to the beach and used my 4wd for the first time. Goes in and out of 2h and 4h fine but my question is, when in 4l should i put it in neutral before i go back to 4h? When i was stopped in drive and tried to go from 4l to n to 4h, it screamed at me. Well, made a loud grinding noise. I know its a silly question but its the first time ive ever used it.
Thanks in advance

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Old 06-14-2014, 03:43 PM   #2
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You can shift between 2Hi and 4Hi while driving at any safe speed. That is because 4Hi is a "synchronized" gear, like a manual transmission's gears are.

Regarding 4Lo, that particular gear is not synchronized. So you have to be either stopped or at a dead-slow crawl to shift into or out of 4Lo. Depending on the transmission, being at a dead-slow crawl can help minimize grinding when shifting in/out of 4Lo. A little grinding is normal at times when shifting into 4Lo, I minimize mine by driving driving at that "dead-slow" crawl I mentioned. Any slower and I'd be stopped. Rolling just at that dead-slow crawl will allow the gears to mesh since if you're completely stopped, the gears may not be aligned well enough against each other to mesh without grinding. The more you shift into/out of 4Lo, the more you'll acquire the feel for how to shift into it to minimize the grinding.

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Old 06-14-2014, 05:26 PM   #3
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Actually the transfer case in the TJ has no synchronizer unlike the earlier version of the 231 but the tj does not need one since it has fixed hubs the front wheels always keep the front driveshaft up to speed so the engagement is between two that are already spinning at same rpm so no syncro needed

Now the yj with CAD did not have the front drive shaft up to speed in 2WD so there the bronze cone synchronizer found in that early version of the NP 231 was useful to bring the front driveshaft up to speed as you shifted to 4 hi
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Old 06-14-2014, 05:35 PM   #4
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I didn't say 4Hi had a synchronizer, I said 4Hi was synchronized.
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Old 06-14-2014, 05:38 PM   #5
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Yes but in a manual transmissions they aren't spinning same speed until the syncro bring the gear to a matching rpm

So not synchronized like a manual transmission is synchronized
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Old 06-14-2014, 06:30 PM   #6
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Old 06-14-2014, 06:39 PM   #7
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Regardless of tranny, come to a slow crawl as suggested and either depress the clutch or shift auto to neutral prior to going into 4L and coming out of 4L
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Old 06-14-2014, 07:38 PM   #8
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Regardless of tranny, come to a slow crawl as suggested and either depress the clutch or shift auto to neutral prior to going into 4L and coming out of 4L
Thank you

And thanks to everyone else.
Just got home and double checked everything. Its auto btw.
I def have to go into neutral to get out of 4Lo. Otherwise the grinding is horrible. Also, when its in 4hi, is it normal for "part time" to light up on the dash? I had a early 90s cherokee before but never used the 4wd. So its completely new to me.
When do i use 4hi and when do i use 4lo?
When i was on the beach i used 4hi and honestly didnt even look at the dash. It worked great.
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Old 06-14-2014, 07:57 PM   #9
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My 00 says "PART TIME" also, both 4Hi and 4Lo. I usually run low range in the sand but depends on how fast you want to drive. Mine has 33s with 3.07 gears behind a 3 speed auto to so usually in the river bottom (much like beach sand) it's low range with the tranny in drive.
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Old 06-14-2014, 08:07 PM   #10
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Thank you Doubleought. Youve been supplying me with a lot of helpful info. I dont know what gears im running yet. I think its all stock but the tires and a small lift. I dont plan to go on the sand much anymore. It was just my first real drive with it today. Ran 259miles no problem.
I will usually be going to gore, va to big dogs off road. For some minor rock crawling type stuff. But im just beginning. Im a competent mechanic and all but never had the pleasure to work on jeeps. Just wanted to make sure the part time thing wasnt an issue.
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Old 06-14-2014, 08:55 PM   #11
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The TJs are amazing vehicles. I owned a CJ5 back in the early 80s for a few years and loved it, but our TJs, especially my 00 has been the most reliable vehicle I have ever owned. It is still my favorite to drive out of all the vehicles we own. Pushing 200K now on original motor and tranny. They aren't perfect but dang near it. Also, a lot of great info and good folks on this forum. I have been referring to it for over 4 years. Hope you enjoy yours as much as we enjoy ours!
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Old 06-14-2014, 10:44 PM   #12
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I'll never sell my TJ. Once had a dream I sold it, what a nightmare.
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Old 06-15-2014, 12:47 AM   #13
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Old 06-15-2014, 08:19 AM   #14
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Quote:
Originally Posted by PineappleOranges View Post
I have a 5 GB Verizon hot spot and if I download this video (49 min) it will cost me. Where can I get this video? I recently purchased a 2004 Wrangler TJ Sahara and love it. I have not used 4WD and have not removed the top yet, this video would be great help.
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Old 06-15-2014, 08:53 AM   #15
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Free wifi McDonald's Lowes most libraries and community centers park or go inside and log on without using your hotspot
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Old 06-15-2014, 09:05 AM   #16
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Free wifi McDonald's Lowes most libraries and community centers park or go inside and log on without using your hotspot
Thanks, I had not thought of that. What do you mean "go inside and not log on "?
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Old 06-15-2014, 09:33 AM   #17
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You have to hit agree but you can get signal inside the store or in a close by parking spot in your car and since you are suing their wifi you don't use your hotspot just the wifi On your handheld tablet or pc
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Old 06-15-2014, 11:42 PM   #18
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Got it, thanks.
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Old 06-16-2014, 12:04 AM   #19
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Part time is just signifying it's in 4x4 mode and doesn't imply it's working part time. Unlike my Wife's Durango, Jeep didn't separate it into 4hi and 4lo as anyone SHOULD be able to figure it out .


Theres basically 2 different "styles." Part time and Full time.

Part Time HATES hard stuff like asphalt and HARD dirt. It's not intended for it and if you crank too hard the whole vehicle will start "jumping." Part time loves mud, shallow water, sand, loose soil, etc.

Full Time doesn't care what the road surface is. It can drive in 4x4 (High or low) mode both Hard or Soft

4X4 high gives you "normal" driving with power to all 4 wheels. 4x4 Low amplifies your torque and gives you MUCH slower speeds but with MASSIVE "pulling" power. If you're riding the clutch pretty good or the the vehicle seems to struggle mightily, then it's time to grab 4lo. You have MUCH more precise control of the entire situation.

And may I say that body is FANTASTIC....and the gal standing next to it isn't shabby either
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Old 06-16-2014, 06:29 AM   #20
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Another way to look at it part time requires front and rear driveshaft to make same number of rotations while full time has a viscous or geared differential between the front and rear driveshaft

Thus in a given tranny gear at a given engine rpm both need a total of x driveshaft rotations but in part time front does x/2 and rear does x/2 but in a full time mode front does a and rear does b and a+b=x
But one can increase as long as other decreases the same amount which comes in handy on non straight line travel

Cherokee used same cluster as wrangler some years and they had the np231 like yours or the np242 which had a extra position of full time 4wd so they put both lights in the cluster

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