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[lefty]

Just had somebody who claims they are an expert telling me that I should never use 4wd full time on a dry road??

I thought that 4wd part time might damage the transmission because of "wind up" but I was under the impression that FT was OK???

I don't actually use it much but when it's wet the MT's are really crap and it gets interesting negotiating dual carriageway roundabouts at 40mph...  

Anyone got any opinions? is he talking out of his ass or am I??  :?

[UKJeeper]

Your "expert" is a tosser.

4wd "full-time" is just fine on the tarmac, "part-time" is for loose. slippery sufaces.

The difference is that "full-time" allows the front and rear axles to turn at different speeds, just like the diff you have in both axles allows the wheels to turn at different speeds in corners.

"Part-time" locks that ability out.

Its OK to leave "full-time" engaged all the time. Doesn't hurt anything and makes no real extra fuel consuption as the front axle is turning all the time anyway (no disconnects like a part time ONLY system IE: YJ's and TJ's).

[lefty]

That's exactly what I thought mate, thanks for the that!!

[chrisjones]

On road:

4WD Full time GOOD.

4WD Part time VERY BAD!!!

Off road:

4WD Full time GOOD

4WD Part time MUCH BETTER!!!


He's talking out of his ass!- You're right, he's wrong.

[lefty]

4WD Part time MUCH BETTER!!!

lol

and as for:

Your "expert" is a tosser

and

He's talking out of his ass!- You're right, he's wrong.

It's a mechanic at the garage who are fixing my UJ's who told me that.  

I'm gonna tear him a new one when i go along this avo to pay for it...

[Mort]

Trish runs her XJ in Full-Time 4x4 all the time.  Never any problem, and handling much improved.  

It might be worth trying it to see how it compensates for your MTs - I reckon you'll be surprised how much better it handles.

[lefty]

Well that's the thing, i do use FT when it's wet because otherwise it's oversteer city!

[Anonymous]

Couldn't agree more with whats been said, the mechanic is a tosser  

[Anonymous]

Hmmmm.... now, my knowlege on this is from reading the Paj sites, but I believe the XJ Tranny is a chain drive as well.

It has been said on the Paj forums that running in Part time 4x4 can lead to premature streching / f'ing of said chain in the tranny box and a nice repair bill. obviously it's MUCH worse if you try Part time on road.

Using Full time on road when needed is fine, but unlike the Yota, it is designed to run in 2wd for general everyday use and full time 4x4 when needed.

I Restate, this was the opinion when this was discussed on the Paj forum.

Maybe someone can shed some light?

EE

[Mick O]

On road:

4WD Full time GOOD.

4WD Part time VERY BAD!!!

Off road:

4WD Full time GOOD

4WD Part time MUCH BETTER!!!


He's talking out of his ass!- You're right, he's wrong. :!:  :!:


 

[chrisjones]

Bugger! and I was doing so well to!

I alway run mine in 4WD FT on the road.

I've never heard of this causing premature ware in the T case.  I guess it could ware quicker than if you use 2WD, but the general opinion amongst XJ owners seems to be that its fine.

[Mort]

Hmmmm.... now, my knowlege on this is from reading the Paj sites, but I believe the XJ Tranny is a chain drive as well.

It has been said on the Paj forums that running in Part time 4x4 can lead to premature streching / f'ing of said chain in the tranny box and a nice repair bill. obviously it's MUCH worse if you try Part time on road.

Using Full time on road when needed is fine, but unlike the Yota, it is designed to run in 2wd for general everyday use and full time 4x4 when needed.

I Restate, this was the opinion when this was discussed on the Paj forum.

Maybe someone can shed some light?


EE

I'd have thought that the stress would be concentrated in the axle, rather than the chain, due to torque.  

FWIW the manual and the sticker behind the driver's visor say that Full-Time can be used all the time - I haven't seen anything that says 2WD is the default position.  The main advantage of 2WD is marginally better fuel consumption (about 1 mpg according to my tests).

[Anonymous]

Only thing that gave it any weight in my mind was that the chain would be under tension during use.

Prob urban myth though, Japs normally do stuff properly, and I reckon there's a fair chance the LC has a chain too and that doesn't have a 2wd option.

EE

[lefty]

I picked up the xj today and made the point by showing the mechanic in question both the manual (states that "4wd Full time can be used in all conditions on all road surfaces") and the panel on the sun visor which says the same thing in slightly fewer words.

Response?

"Well, it's all we could think of that would have worn out the UJ"

Twats. I paid £150 for the privelege too. They claim they dismanled the axle to check the driveshaft but it was fine.

Thanks for your help guys, without you i might well have been taken for an £800+ bill for a new shaft...  

[KELTICKNIGHT]

can you drive 4wd at high speed like 60-80 mph like in 2wd without probs

[chrisjones]

Response?

"Well, it's all we could think of that would have worn out the UJ"

 :wink:

[Woody]

KelticKnight

if your Jeep (sorry don't know what you've got) has 2WD, Part Time 4WD-Hi and Full Time 4WD-HI then you can run Full Time 4WD as fast as the Jeep will go.  I run my XJ in Full Time everywhere on road and have never had any problems at 70mph (well I can't admit to anything faster can I   ).

[KELTICKNIGHT]

hey  woody
have a 2.5 cherokee crd commerical[liberity] which is diesel
has 2wd hi
4wd hi
4wd low
mostly use 2wd low as l thought driving on 4wd all the time would be bad for it,only have used 4wd hi in wet conditions
so its ok to use it in all conditins

[Mike Pavelin]

You have a 231 transfer case, which has part time 4wd only. You must only use this in extreme slippery conditions or you run the risk of severe driveline wind-up and possible severe damage.

[KELTICKNIGHT]

You have a 231 transfer case, which has part time 4wd only. You must only use this in extreme slippery conditions or you run the risk of severe driveline wind-up and possible severe damage.

Mike
is it me has the 231 case or lefty

[isle of man]

it's you....

peter henry

[KELTICKNIGHT]

cheers
so only in wet conditions use 4wd hi,
which is when l use it
cheers

[Mort]

cheers
so only in wet conditions use 4wd hi,
which is when l use it
cheers

Errr......... no!  You don't use Part-Time 4WD on-road EVER - unless the road is completely covered in thick snow, and there aren't patches where the tarmac is visible.  

Your Part-Time 4WD system is designed exclusively for off-road use (whether hi or low ratio) and it locks the central diff, so that the front and rear axles are turning at the same speed.

If you run in 4WD you run the risk of breaking something bigtime, or suffering from dangerously unpredictable handling.  

Only vehicles with FULL-TIME 4WD should be used in 4WD on-road.  These have an open diff in the transfer case, so the front and rear axles can turn at the different speeds that are necessary when, for example, turning a corner.

Sorry to lay it on thick, but I'd hate you to break something, or get involved in a accident because of this.

[KELTICKNIGHT]

cheers mort,
wont worry about snow as its rare to see the white stuff here
now to fix this bloody heater swtich or motor