rear diff wound up

[henryandlesley]

will it be easier to take my diff out and replace it with another one or unwind mine it has been like it since i have had the truck and now i am doing work on it i want to do the diff the last owner drove it arround in diff lock which i was told would wind up a diff

[eugene]

at least its the diff you wound up and not lesley again lol had to get that in  :dance:

[eugene]

i know what you told me last night bbut me been thinking surley it would of wound the t.box up as well just a thought mate

[crazymac]

What symptoms are you getting??

I would have thought that if the previous owner had driven in difflock all the time then they would have broken something in the drive train?? The diff will only take so much untill something goes BANG!!!

Get it onto some soft ground and that will unwind things. No need for removal that I can see?

[Disco_Stu]

Let it spin, stop it after a few secs, let it go again and continue until its not wound up any more.

No need to remove the diff unless it breaks.

[wizard]

Yep wot he said.
When it stops spinning all is good.
If it goes  bang when driving all is bad.

You dont need to replace it.

wizard :twisted:

[crazymac]

can i do that whilst it is on axle stands and the front on ramps

If you can get all  wheel off the ground then that will guarantee that all will spin until unwound.

[crazymac]

how will i know when it has un wound its self

Stops spinning

[Disco-Ron]

Simply jack up one of the rear wheels, you won;t need to physically spin it, if it is wound up at-all it'll release itself, you ideally need to do this with the handbrake off, so if it needs to it can undo any tension in the transfer box, ......

The other option, is to simply find a gravel drive or similar to drive on nif there is any tension in the system it will unwind itself.......

[wizard]

Just because the diff lock light is off doesnt' mean the transfer box has disengauged.

wizard

[boss]

Just because the diff lock light is off doesnt' mean the transfer box has disengauged.

wizard

i second that my T/box had to have a rebuild becasue the previous owner had left the lock in and just pulled the swith off of the transfer case.

the drive line shouldnt stay wound up.  things brake to easleley :lol:

[muddymud]

Just because the diff lock light is off doesnt' mean the transfer box has disengauged.

wizard

i think i have this!

in my truck i blew the rear diff and then put a new one in. but when i turn full lock something goes bang  and the wheels are always scrubbing a bit. i tryed reversing for ages and the diff lock light is off. could i jack all 4 wheels off the floor and see if any wheels spin?

[wizard]

Sounds like you have the center diff engauged.
have a look at the linkages under ther transfer gear lever while someone is operating it from side to side. Hopefully you will be able to seeif its stuck.

wizard :twisted:

[Range Rover Blues]

I think some of you might be confused a little.  Just how far can a diff become "wound up"?.

[Disco_Stu]

Depends what you say about it's mother.

[wizard]

Here,s a bit of info i borrowed from somewhere. :shock:



When a 4WD is travelling in a straight line all four wheels rotate at the same speed, but during cornering each wheel travels at a different speed due to the radius of the turn. All vehicles have a differential on the front and rear axles to allow the wheels on the same axle to rotate at a different speed. Constant 4WD’s have a central differential fitted  to allow for different speeds between front and back wheels, but most part-time four wheel drives do not.

When a part-time 4WD (without a centre differential) is in 4WD an attempts to corner on bitumen, all wheels need to rotate at different speeds, but without a centre differential they cannot. This creates the phenomena called "axle windup" or "transmission windup". High strain is placed on the drive shafts and transmission, eventually causing one of two things to happen. Either one of the wheels slips or spins to overcome the stress or the drive-shaft/transmission breaks. This is why part time 4WD’s should never select 4WD on bitumen.

Constant 4WD’s have a central differential within the transmission to overcome this problem. However once in the dirt a constant four wheel drive can be bogged with only one wheel spinning. This is why they have a central differential lock that stops the action of the centre diff and makes it like a part-time four wheel drive in 4WD mode. The centre diff lock should never be used on bitumen or non-slip surfaces for the reasons mentioned above.

In reality, a 4WD is only a two wheel drive with one front and one back wheel driving when traction is lost. One wheel on each axle spins while the other receives no drive at all due to the action of the differential. The exception to this is where a limited slip or locking differential is fitted. A limited slip diff allows a limited amount of drive to be applied to the stationary wheel before the other wheel on the same axle spins. A locking diff allows no slip at all and both wheels on the same axle turn at the same speed, regardless of the amount of traction



wizard :twisted:

[Range Rover Blues]

I was with it up to the last paragraph, a 4wd is really a 2wd :-., then surely a 2wd is really a 1wd et al.  The point of 4wd is that provided only 1 axle is in the puddle at once you never notice the loss in grip, that and the amount of power availbel is spread between twice as many wheels to reduce the chance of wheelspin.

Anyhoo, back to the question at hand, windup.  In degrees how far will the transmission wind up before it breaks? does anyone know :-k

[wizard]

4WD is a bit missleading. If you have front and rear lockers and a center diff then you really are 4WD Most 4x4's are effectively 2wd because if you engage the center diff and lift a wheel on each axle off the ground (cross axled) you wont go anywhere because the drive (power) takes the path of least resistance.
Winding the diff up is also not totally accurate, but transmission wind up is.

I dont know how much "windup" is required to cause any damage.
To test this we need a volunteer to engage diff lock and  record the mileage on tarmac before something brakes. (only joking)


wizard

[carracarra13]

you paying for fixes lol :lol:

[Disco Matt]

The impression that I get from various magazine letters pages is that you would notice before breaking something. The steering will feel very odd and it won't want to turn tightly.

I know that if I'm on a loose but dry surface like gravel I tend not to use the diff lock, as it makes the car reluctant to turn in.

[chris9119]

stupid question, but what has the diffs/transfer box got to do with steering..... diffs/transfer go around and around, the steering goes side to side and technically, are not interconnected other than the half-shafts......

[tack43]

During cornering (turning) the front wheels travel different distances ( radius). With difflocks engaged the wheels will want to travel the same distance. Somethings got to give either wheel slip, something breaking (diff, halfshaft) or the steering tries to staighten itself (heavy steering). This will be noticable with centre difflock engaged an even more so with axle lockers engaged!

Rich

[Range Rover Blues]

Heavens, don't try in with axle lockers engaged :shock: ask me how I know :-.

[Range Rover Blues]

4WD is a bit missleading. If you have front and rear lockers and a center diff then you really are 4WD Most 4x4's are effectively 2wd because if you engage the center diff and lift a wheel on each axle off the ground (cross axled) you wont go anywhere because the drive (power) takes the path of least resistance.
wizard

This discussion needs more beer :?

[Xtremeteam]

Heavens, don't try in with axle lockers engaged :shock: ask me how I know :-.

hell yeah

build some boost & pop the clutch


not advisable unless you have a seriously uprated transmission

[lurch_917]

 ive actuly seen a fitter jack the back up to change a tyer and the motor spun its self off the jack oops thats alot of wind up

[wizard]

You want to get this sorted before you break something.
Have you had a look at the linkages on the transfer lever yet.
What position is the transfer lever in. It should be close to the drivers side and back.

wizard

[ibruceuk]

I dont know how much "windup" is required to cause any damage.
To test this we need a volunteer to engage diff lock and  record the mileage on tarmac before something brakes. (only joking)

Well interesting you should say this!

When I went to look at a new Disco, one unscrupulous seller on a farm was selling a very clean R plate disco.  It drove brilliantly round the farm and was very tidy for the money.  The difflock lever would move side to side (i.e. not connected)  he said it was just disconnected as all police vehicles are disconnected.

He was very very rulctant for me to take it on road, his farm was huge, and he kept going on about not insured etc.  I sorted out my insurance to cover it as I insisted I wanted to see what it was like at a reasonable speed.

To cut a long story short, it was jammed in Difflock and he had disconnected the light and lever.  It lasted half a mile on tarmac before BIG band as the front prop snapped.  Needless to say I didn't buy it and he was most unimpressed!

So to answer your question, half a mile!

[thermidorthelobster]

From reading this thread you could be forgiven for concluding that by driving around in diff lock you get wind-up which you need to somehow unwind many miles later.

The wind-up either (a) breaks something if you leave diff lock in and drive around on tarmac, which you will notice; or (b) unwinds just fine thanks when you disengage diff lock, or when you drive backwards and forwards a bit whilst trying to disengage diff lock.

It's not like screwing something in and then it stays there until you unscrew it again.

[tack43]

You can also lose the wind up with wheel slippage as ibruceuk found out while driving on loose surfaces on that farm!

Rich