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Old 04-03-2012, 12:49 PM   #1
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NEW to JEEPS. Grinding into 4 Low?

Hey everyone I'm new to site and just purchased my first jeep A 2000 Jeep Wrangler Sahara. I would like any information I can get, related to your experience with a similar model Jeep. I would like to know what I can expect.
Also any help with the below would be greatly appreciated.

I noticed that when I engaged 4 Low it made a horrible noise. I tried it in neutral and park with the same results. Should I be moving? Any suggestions?

Also looking to start modding, I already have a lift, 35's, detachable sway bars, a JET chip, and a K&N filter. I would like some recommendations as what should be next. Also I would like to keep these reasonable in price and avoid the expensive jobs until something breaks. Any suggestions would be appreciated.

FYI my mechanical skill is moderate, however IDK anything about Jeeps.
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Old 04-03-2012, 12:52 PM   #2
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neutral at a stop

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Old 04-03-2012, 12:53 PM   #3
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oh and regear for next mod.
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Old 04-03-2012, 01:00 PM   #4
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Quote:
Originally Posted by BAMA-TJ
Hey everyone I'm new to site and just purchased my first jeep A 2000 Jeep Wrangler Sahara. I would like any information I can get, related to your experience with a similar model Jeep. I would like to know what I can expect.
Also any help with the below would be greatly appreciated.

I noticed that when I engaged 4 Low it made a horrible noise. I tried it in neutral and park with the same results. Should I be moving? Any suggestions?

Also looking to start modding, I already have a lift, 35's, detachable sway bars, a JET chip, and a K&N filter. I would like some recommendations as what should be next. Also I would like to keep these reasonable in price and avoid the expensive jobs until something breaks. Any suggestions would be appreciated.

FYI my mechanical skill is moderate, however IDK anything about Jeeps.
Best advise is to read a lot on here or related forums before making a decision. Also, with help from here, you can do more mods yourself than you would have thought.
As for engaging 4-low, my best luck has always been moving slow (1-3 mph approx) in neutral. Just pull the lever into 4-low, no noise, smooth as butter.
Using the search function on here will help you a lot.
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Old 04-03-2012, 01:24 PM   #5
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Yeah you have to be moving to engage any of the 4wd be it 4h or lo. Up to 50mph for hi and up to 5mph for lo. You do not need to be in neutral eaither it will just pull right in and won't cause you any problems. Good luck!
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Old 04-04-2012, 12:05 PM   #6
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Yeah, just tried mine again. 4-low definitely does not like being in gear. 01 4.0 5-speed manual. Maybe there's something up with my t-case, which wouldn't surprise me. It's been that way as long as I can remember. Like I said, my best luck is neutral.
For the OP, just remember that when we say "moving" to go into 4wd, all the tires should be traveling at the same speed. If your rear tires are spinning and your front isn't, don't pull the 4wd lever.
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Old 04-04-2012, 12:57 PM   #7
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Quote:
Originally Posted by fourty4magjr View Post
Yeah you have to be moving to engage any of the 4wd be it 4h or lo. Up to 50mph for hi and up to 5mph for lo. You do not need to be in neutral eaither it will just pull right in and won't cause you any problems. Good luck!
This is only true when you are shifting between 2WD and 4HI. It is very incorrect when shifting into or out of 4LO.

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Originally Posted by HarryJeepGuy View Post
Yeah, just tried mine again. 4-low definitely does not like being in gear. 01 4.0 5-speed manual. Maybe there's something up with my t-case, which wouldn't surprise me.
Re-read your owner's manual--Jeep is very clear on this topic. Whenever you shift into or out of 4LO, you must press the clutch pedal and be moving less than 4 mph. There is nothing wrong with your transfer case; you are simply operating it incorrectly.
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Old 04-04-2012, 01:09 PM   #8
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There should be a little grinding when you go into 4 low. You are going from a 1:1 to a 1:2.72 or something like that. At the exact instant you decide to shift, the gears are probably not going to line up exactly. just like if you try to put a manual into gear with out using the clutch, it can be done but they need to line them up, or rev match going back to the transmission example.

This is why your supposed to be rolling slightly (1-3 mph), so if they are not perfectly lined up, they will grind until they line up. This is also why you should practice it before you need it, and it should be a firm, but not forceful pull back.

And always remember if you think you will need it, its easier to put it into 4L at the bottom of the hill, than stalled out / stuck halfway up...
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Old 04-04-2012, 01:13 PM   #9
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If the grinding is really freaking you out but you want to test to be sure it works, in N turn the jeep off and engage 4lo.
Also, don't test it on dry pavement.
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Old 04-04-2012, 01:19 PM   #10
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My instruction manual said that some grinding is normal when shifting in/out of 4LO. However what I have found to eliminate the grinding is to roll at 5mph, clutch-in, shift to neutral, keep rolling until speed is almost to a stop (1mph or so), then a smooth shift from 4HI to 4LO (or vice-versa) passing through (but not stopping at) transfer case neutral.
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Old 04-04-2012, 05:54 PM   #11
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Quote:
Originally Posted by Sherpa

This is only true when you are shifting between 2WD and 4HI. It is very incorrect when shifting into or out of 4LO.

Re-read your owner's manual--Jeep is very clear on this topic. Whenever you shift into or out of 4LO, you must press the clutch pedal and be moving less than 4 mph. There is nothing wrong with your transfer case; you are simply operating it incorrectly.
Re-read post 4... That's how I've always done it. Only tried it again after reading post 5. Thanks for the reassurance that my t-case is ok.
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Old 04-04-2012, 06:06 PM   #12
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Quote:
Originally Posted by Harddrive
My instruction manual said that some grinding is normal when shifting in/out of 4LO. However what I have found to eliminate the grinding is to roll at 5mph, clutch-in, shift to neutral, keep rolling until speed is almost to a stop (1mph or so), then a smooth shift from 4HI to 4LO (or vice-versa) passing through (but not stopping at) transfer case neutral.
This ^.
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Old 04-04-2012, 10:59 PM   #13
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Procedures for shifting 4HI-4LO vary slighty for auto/manual.

For Auto, you will get best results in 'N' and fully stopped.
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Old 04-05-2012, 11:00 AM   #14
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Thanks for all of the comments good people. After careful testing it would appear that less than 5 mph in Neutral is smooth as silk for 4 Low. 4 high will engage regardless of gear. Appreciate it and I look forward to learning all I can about upgrading my TJ myself.
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Old 04-05-2012, 11:51 AM   #15
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Quote:
Originally Posted by Sherpa View Post
This is only true when you are shifting between 2WD and 4HI. It is very incorrect when shifting into or out of 4LO.

Re-read your owner's manual--Jeep is very clear on this topic. Whenever you shift into or out of 4LO, you must press the clutch pedal and be moving less than 4 mph. There is nothing wrong with your transfer case; you are simply operating it incorrectly.
Ok so can you explain further on this not saying your wrong just curious as to why it's wrong when shifting into and out of 4l? It's worked for me effortlessly. Maybe I read wrong in the owners manual? Idk lol always willing to learn!
Oh and mine is an auto btw

Quote:
Originally Posted by SinfulDragon View Post
If the grinding is really freaking you out but you want to test to be sure it works, in N turn the jeep off and engage 4lo.
Also, don't test it on dry pavement.
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Old 04-09-2012, 05:59 AM   #16
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Shifting into 4 Hi or 4 Low

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Old 04-09-2012, 07:15 AM   #17
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Quote:
Originally Posted by mynewjeep View Post
A manual transmission needs to be shifted into neutral too, not just press the clutch in. Sure you can probably get away with just pushing in the clutch, but you will get some grinding noise as you make the transit from 4HI to 4LO.

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