those with 4 full time

Guest · **Posted:** Tue Oct 02, 2007 12:18 pm

hyedipin wrote:

KJpilot wrote:

hyedipin wrote:

sleeve84028 wrote:

with or without that slack, the full time system is really handy when you need to get around town and the weather is bad.

Sure, I used 4x4 FT All the Time until I started hitting slow traffic and the bang started bothering me, so now I only use it when I don't have to do a lot of slow-traffic, where the bang seems to show its ugly face the most. Otherwise, it is the best thing ever. I am lucky that I didn't get a sport and get stuck with 4HI. I actually thought 4HI acted funny since it just cannot seem to settle on the road when driving on bumpy or mixed road conditions like partially snow, partially wet.

BANG?!? Holy cow, there's not that much slack!

Oh yeah, there is. I gotta record it for you guys one day. It is LOUD!

OK, let me rephrase that... Holy Cow there shouldn't be that much slack!

There definately is not in my KJ and was not in my WJ.

JeepBeat · **Posted:** Tue Oct 02, 2007 11:36 pm

bugnout wrote:

JeepBeat wrote:

what mode should I be in when I want 4WD?? Should I shift into full time or part time for travelling in town and highway, on snowy, and/or ice covered roads? The part and full time confuses me, I guess only because I haven't used it yet.

Part Time 4WD has constant drive to both the front and back axles but differential drive to each wheel. and should not be used where traction is good as you can damage the transfer case especially when cornering. Best used on snow and ice.

So, part time will give drive to each wheel independently, depending on traction? Is this correct? So, if I had the Jeep in full time, all four wheels are driven at the same time, regardless of traction or slip on any particular wheel?

zexipher · **Joined:** Wed Sep 19, 2007 10:29 am **Posts:** 13

For JeepBeat:

I've only had my KJ for a few weeks, and only realized I had Select-Trac today. I thought I had Command-Trac until I bothered to actually look down in a ridiculous rain storm this afternoon irritated at my HD tires slipping around and saw FULL TIME. Needless to say I enjoyed the discovery...

To answer your question from what I know... and don't quote me... but....

Part Time 4WD forces the front and rear wheels to rotate at the same speed locking the transfer case inter-axle differential. On dry pavement, through a turn, these wheels WANT to rotate at different speeds but cannot in Part Time. So this can cause damage if used for normal driving and would probably be dangerous.

Full Time 4WD uses a center differential to allow the front and rear wheels to rotate at different speeds. So on dry pavement, where there is no slipping, you can still drive without damage to your vehicle.

sleeve84028 · **Posted:** Wed Oct 03, 2007 7:34 am

That's pretty much it.

Part Time shouldn't be used on ground that doesn't allow for wheel slippage. Surfaces like dry roads + turns can really damage your truck.

Full Time can be used in all conditions because of the open differential inside of the transfer case.

Northbee · **Posted:** Wed Oct 03, 2007 10:39 am

Full Time 4WD is keeping me from buying the Wrangler Unlimited.

I spend 80% of driving on paved roads and simply enjoy Full Time 4WD in rainy or slippy conditions where you would not use Part Time yet.

With the Wrangler you are always in 2WD in those situations .... or does the Wrangler have something similar to Full time 4WD ?

Guest · **Posted:** Wed Oct 03, 2007 2:25 pm

Northbee wrote:

Full Time 4WD is keeping me from buying the Wrangler Unlimited.

I spend 80% of driving on paved roads and simply enjoy Full Time 4WD in rainy or slippy conditions where you would not use Part Time yet.

With the Wrangler you are always in 2WD in those situations .... or does the Wrangler have something similar to Full time 4WD ?

Nope, Command-trac & Rock-trac, which is a beefier lower geared version of Command-trac.

JeepBeat · **Posted:** Wed Oct 03, 2007 3:39 pm

sleeve84028 wrote:

That's pretty much it.

Part Time shouldn't be used on ground that doesn't allow for wheel slippage. Surfaces like dry roads + turns can really damage your truck.

Full Time can be used in all conditions because of the open differential inside of the transfer case.

Thank you guys!! That totally answers my questions and wonders. For my needs, I will stick with Full Time for snow/ice conditions. So, what is the largest use for Part Time? I would assume rock or uneven terrain, where there is not a lot of turns, or chances of slippage in turns. Thanks again....

_UnLiMiTeD_ · **Posted:** Wed Oct 03, 2007 3:43 pm

part time would be better for lots of snow and ice since its forces the wheels to turn, less slippage

JeepBeat · **Posted:** Wed Oct 03, 2007 3:53 pm

For lots of snow and ice, if I used Part time, I guess it wouldn't hurt when turning, because there would be enough slippage,, right??

_UnLiMiTeD_ · **Posted:** Wed Oct 03, 2007 8:06 pm

well since we are on the subject of 4wd. Today i was using the full time 4wd because it was a huge rain storm out. I get to work and park it and leave it in 4wd full time. By the time work ends, the storm is gone and its sunny out and almost dry. Yes our weather is very wierd

So i turn it on, put it in neutral, drop it back into 2wd and put it in reverse then drive and start to go. I get about 5 feet and i hear this pop and the vehicle lurches forward a bit and it was like in neutral, didnt move when i gave it gas. Freaked me out a bit, so i put it in neutral, put it in 4wd and then back to 2wd and tried it again and it was fine once it found the gear. I know someone mentioned sometimes it wont fully be in 2wd and could do this, im just wondering if this will hurt anything? first time its done it because i dont use 4wd that much.

I checked the 4wd when i got home and everything still worked and went back to 2wd fine.

tjkj2002 · **Posted:** Wed Oct 03, 2007 8:15 pm

Quote:

Rock-trac, which is a beefier lower geared version of Command-trac.

The RockTrac t-case is labeled the NV241J,the 241 series t-case's are 3/4ton-1ton rated t-cases.They added extra ribbing on the 241J case to take the abuse of rockcrawling and went from the 2.72:1 low to 4:1 low ratio.The 241 is totally different then the 231 t-case in everyway besides it also only has 2hi,4hi,N,and 4low like the 231 and 90% of all other t-cases.

KY Liberty · **Joined:** Sat Jul 09, 2005 1:46 pm **Posts:** 1195

_UnLiMiTeD_ wrote:

well since we are on the subject of 4wd. Today i was using the full time 4wd because it was a huge rain storm out. I get to work and park it and leave it in 4wd full time. By the time work ends, the storm is gone and its sunny out and almost dry. Yes our weather is very wierd

So i turn it on, put it in neutral, drop it back into 2wd and put it in reverse then drive and start to go. I get about 5 feet and i hear this pop and the vehicle lurches forward a bit and it was like in neutral, didnt move when i gave it gas. Freaked me out a bit, so i put it in neutral, put it in 4wd and then back to 2wd and tried it again and it was fine once it found the gear. I know someone mentioned sometimes it wont fully be in 2wd and could do this, im just wondering if this will hurt anything? first time its done it because i dont use 4wd that much.

I checked the 4wd when i got home and everything still worked and went back to 2wd fine.

Don't shift the transfer case like that. It's best to leave it in the FT4WD until you get to a straight stretch. Then shift it. Otherwise you end up jamming it into a different mode.

tjkj2002 · **Posted:** Wed Oct 03, 2007 8:30 pm

KY Liberty wrote:

_UnLiMiTeD_ wrote:

well since we are on the subject of 4wd. Today i was using the full time 4wd because it was a huge rain storm out. I get to work and park it and leave it in 4wd full time. By the time work ends, the storm is gone and its sunny out and almost dry. Yes our weather is very wierd

So i turn it on, put it in neutral, drop it back into 2wd and put it in reverse then drive and start to go. I get about 5 feet and i hear this pop and the vehicle lurches forward a bit and it was like in neutral, didnt move when i gave it gas. Freaked me out a bit, so i put it in neutral, put it in 4wd and then back to 2wd and tried it again and it was fine once it found the gear. I know someone mentioned sometimes it wont fully be in 2wd and could do this, im just wondering if this will hurt anything? first time its done it because i dont use 4wd that much.

I checked the 4wd when i got home and everything still worked and went back to 2wd fine.

Don't shift the transfer case like that. It's best to leave it in the FT4WD until you get to a straight stretch. Then shift it. Otherwise you end up jamming it into a different mode.

And that is why the 242 is so much weaker then the 231 and much undisireable for offroading.Keep doing that and the fulltime mode will not work anymore and you'll be stuck in part time 4x4 and can't get it out into 2wd,seen it happen to XJ's with the 242 and I know others here have to.

_UnLiMiTeD_ · **Posted:** Wed Oct 03, 2007 8:55 pm

dont worry, i wont again. But doing it once wont hurt it right?

KY Liberty · **Joined:** Sat Jul 09, 2005 1:46 pm **Posts:** 1195

_UnLiMiTeD_ wrote:

dont worry, i wont again. But doing it once wont hurt it right?

Everybody's done it. You should be fine, but you need to learn how to shift it between 2WD and FT4WD. I find the easiest way is to drive at a constant speed on a straight stretch of road with my foot lightly on the gas. Then shift it to the desired mode. Then slowly let my foot off the gas until I feel it shift through my foot. Then start speeding up. If you practice it a few times, you should get the feel of it so that the transfer is only barely noticeable. You also do not want to turn before it shifts. You really won't like the way that feels.

_UnLiMiTeD_ · **Posted:** Wed Oct 03, 2007 9:24 pm

yes that surging feeling, yes that happend too, i was trying to get out of the parking lot, had no choice! lol

I was always told to drop it into neutral before i shift into 4wd then put back into drive while going down a stretch of road at a decent speed

Guest · **Posted:** Wed Oct 03, 2007 11:00 pm

tjkj2002 wrote:

Quote:

Rock-trac, which is a beefier lower geared version of Command-trac.

The RockTrac t-case is labeled the NV241J,the 241 series t-case's are 3/4ton-1ton rated t-cases.They added extra ribbing on the 241J case to take the abuse of rockcrawling and went from the 2.72:1 low to 4:1 low ratio.The 241 is totally different then the 231 t-case in everyway besides it also only has 2hi,4hi,N,and 4low like the 231 and 90% of all other t-cases.

Uh, yeah... that's why I said "basically"

Guest · **Posted:** Wed Oct 03, 2007 11:03 pm

_UnLiMiTeD_ wrote:

part time would be better for lots of snow and ice since its forces the wheels to turn, less slippage

Lots of snow, absolutely. It's when the snow is plowed or starts melting leaving mostly dry pavement with scattered slick spots that makes FT4WD worth every penny. Black Ice at 70MPH really sucks!

sleeve84028 · **Posted:** Thu Oct 04, 2007 7:50 am

JeepBeat wrote:

For lots of snow and ice, if I used Part time, I guess it wouldn't hurt when turning, because there would be enough slippage,, right??

You can use part time when you drive in:

grass
dirt
lots of snow (enough to keep the tire off of a paved road)
unimproved road surfaces like 2-tracks or dirt roads
Or other conditions.... there's plenty (mud, ice, etc...)

KJ Pilot is spot on about the advantages of the FT feature in the winter. For me in Michigan it goes like this: Snow storm over night typically drops around 3" of snow. This is enough to cover all roads so the plow trucks go out and keep the highways clear but no other roads. I park with FT engaged (overnight) and then don't have to worry about shifting in and out of 4x4 mode while I drive to work. It's really a great thing to drive over all the different road conditions [snow, slush / ice, dry road] without having to do anything except concentrate.

I would never try to select a 4x4 mode and then drive in reverse... I'd be afraid of the aftermath.

_UnLiMiTeD_ · **Posted:** Thu Oct 04, 2007 3:42 pm

great tips and advice in this thread, more i know the better.

Ok for engaging full time. Some say put it into neutral and put it in then go back to drive. Others say just let off the gas mostly and shift it doing a constant speed.

Which one is the best and safest method? i know the method i did yesterday sure as heck didnt work! lol

those with 4 full time

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