Different Modes of 4WD

[holden4th]

Hello, my first post here (after my intro) and I have a newbies question which may seem obvious to most. My previous fourbie was a Pajero and I had access to 2WD, 4H, 4H centre locked and 4L centre locked.

My GU IV only seems to have 2WD, 4H and 4L. So the question I am asking is when is centre locked engaged? Is it right from the moment I go to 4H or is it only in 4L? Is the mode indicated anywhere on the dash controls? I know that I have to manually engage the front hubs and am assuming that this engages the 4WD once I've put the transfer case lever into the desired position. Can I leave the hubs in this mode or will I get transmission wind up.

Where I would engage 4H in the Paj on dirt, friends of mine in Patrols seemed quite happy to stay in 2WD mode and this is also puzzling. I don't think I will be needing to use any 4WD mode until the new year so I've got a bit of time up my sleeve to learn the ropes.

Thanks for answering this. I have other questions and if I can't answers by searching the forum then I'll come back and ask again.

[Bigrig]

Hey mate - no such thing as an obvious or silly question, so keep em coming.

If you have auto hubs (assuming you do) you can simply go from 2wd to 4wd on the fly up to about 60klms per hour (they state up to 80 I believe but I always play on the side of caution) and the hubs lock in automatically and you are now in 4H and ready to roll - no centre locking mechanism. You need to be stationary in neutral to engage 4L and same rule applies - ready to go. Same process for going out of the gears, stopped to go from 4L to 4H but can change back from 4H to 2H on the fly.

If you have manual hubs, you'll need to put them into the locked position to be able to engage 4wd, but you can lock them in prior when you first get to dirt, sand etc and run in 2H with them locked until you need to engage 4wd with no dramas at all.

Hope this helps mate - others will have more to offer also.

[philws]

G'day,

The difference between the Paj and the trol is that the paj is constant all wheel drive, thus engine is always driving the front and back wheels, this is why you don't have hub locks on the paj. it is also why the paj has a center differential, to deal with differences in wheel speed between the front and back when you are driving on tarmac the paj uses a centre differential to split the drive, when you are 4x4ing though you want an equal 50/50 split of drive going front and rear which is why you can lock the centre diff on the paj. with the troll only when you engage 4h or 4l does the drive shaft to the front axle start to spin. to aid driving and reduce wear the troll has free wheeling hubs for when you are on the road, this means that the wheels can spin independently of the axle which is why when you engage 4 wheel drive you need to lock the hub to the axle via either auto hub locks (most GU trolls) or manual hub locks, which you said you have.

Cheers

Phil

[philws]

Sorry the paj isn't constant all wheel drive

[patch697]

G'day,

The difference between the Paj and the trol is that the paj is constant all wheel drive, thus engine is always driving the front and back wheels, this is why you don't have hub locks on the paj. it is also why the paj has a center differential, to deal with differences in wheel speed between the front and back when you are driving on tarmac the paj uses a centre differential to split the drive, when you are 4x4ing though you want an equal 50/50 split of drive going front and rear which is why you can lock the centre diff on the paj. with the troll only when you engage 4h or 4l does the drive shaft to the front axle start to spin. to aid driving and reduce wear the troll has free wheeling hubs for when you are on the road, this means that the wheels can spin independently of the axle which is why when you engage 4 wheel drive you need to lock the hub to the axle via either auto hub locks (most GU trolls) or manual hub locks, which you said you have.

Cheers

Phil

Couldn't have put it better & it also saved me some typing.....hahahaha

Nicely done.

[patch697]

Sorry the paj isn't constant all wheel drive

they still run a center diff which is why they have a center diff lock, much like the early LandRovers. So your post is still relevant to the explanation you gave.

[Dr Drift]

so whats the difference when i put the troll in 4h without locking the hubs as apossed to locking the hubs and 4h or same with 4l....
When i tow the boat up the ramp i just shift the 4x4 stick into 4h and i dont get out off car to lock the hubs? Im new to 4x4ing and thought thats all i need to do and i feel the fronts grip on the ramp and she pulls me up fine...

Dr Drift....

[Dr Drift]

Sorry mine is a 2008 CRD... with manual hubs as there is no button in the car so thats what i assume your talking about as diff lock...
So whats the difference off locking the hubs compared to just shifting into gear without locking hubs... I think the original poster is asking the same thing?

Dr Drift...

[philws]

Are you sure you have manual hubs? Auto hubs don't have a button in the car, the mechanism is still located on the hub but with auto hubs it is actuated by the application of drive to the front axle. manual hubs however require that you get out of the car and twist a switch on the hub to lock it to the axle. As your is a 08 it will have auto hubs unless you have changed it to manuals.

[Dr Drift]

Are you sure you have manual hubs? Auto hubs don't have a button in the car, the mechanism is still located on the hub but with auto hubs it is actuated by the application of drive to the front axle. manual hubs however require that you get out of the car and twist a switch on the hub to lock it to the axle. As your is a 08 it will have auto hubs unless you have changed it to manuals.

Sorry to be a real newbie so dont laugh... Im new to 4bying and i know that i dont have a button in the car. So i assume its manual hubs. I just went to look at the car and yes your right! It says AUTO or locked.... so whats the difference in that sense. Told youz that im new to all this stuff.... rofl

Dr Drift...