Diff wind up in 4wd

Submitted: Friday, Jul 13, 2012 at 21:21
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Just had to put two new tyres on my ute and was wondreing if there will be diff wind up in 4wd as the other two are half worn out. There's about 10mm differance in tread depth and I don't think i will have a problem. What is your opinion on this.

Murray
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Reply By: Michael ( Moss Vale NSW) - Friday, Jul 13, 2012 at 22:11

Friday, Jul 13, 2012 at 22:11
If its full time 4x4 on the blacktop no problem, if its part time on the dirt no problem but you would not drive a part time 4x4 engaged in 4x4 the blacktop at all, regardless of tyre wear. Michael


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Reply By: aussiedingo (River Rina) - Friday, Jul 13, 2012 at 22:14

Friday, Jul 13, 2012 at 22:14
G'day Murray, just run a tape measure around the centre circumference of the tyre tread on the new & old tyres & see how much difference there is - it won't be much to make a difference, if there is maybe put 1 on front 'n 1 on rear to balance it out if it is a big difference. hoo roo
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Reply By: blown4by - Saturday, Jul 14, 2012 at 00:41

Saturday, Jul 14, 2012 at 00:41
Won't be problem because you would only engage 4WD in rough going so the difference in slip angle will equalise through the normal slippage that occurs on loose surfaces all the time. (If that makes sense)
Don't put one new tyre and one well worn tyre on the same axle otherwise the diff will be working overtime to compensate for the different tyre diameters even when travelling in a straight line instead of only when cornering which is what it is supposed to do.
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Reply By: Member - Bucky - Saturday, Jul 14, 2012 at 06:11

Saturday, Jul 14, 2012 at 06:11
Murray
Getting too technical mate.

Will not worry it, as you will be in 4X4 mode in bush, and then slippage will ballance it all out.

If you had 31 1/2's in front, and 35's on the back then you may have a slight problem, but the difference is not that mich, is it ?

Cheres
Bucky
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Follow Up By: Bill BD - Saturday, Jul 14, 2012 at 09:14

Saturday, Jul 14, 2012 at 09:14
I have found it isn't in the Bush that's a problem, rather, on gravel where 4WD is engaged for better traction - that's where different tyre diameter was a problem for me (my spare was a different diameter and I didn't realise). In those conditions there is much less slip and the degree of slip can drop as the surface changes. As for would 10mm be a significant difference... I will leave that to more knowledgable people than I.
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Follow Up By: Polaris - Saturday, Jul 14, 2012 at 13:20

Saturday, Jul 14, 2012 at 13:20
Bucky said ;** "If you had 31 1/2's in front, and 35's on the back then you may have a slight problem, but the difference is not that mich, is it ? "**

Not much difference !! You must be joking - or haven't bothered to do the research !!

As an example.

A BFG Radial All Terrain 31x10.50R15LT/C does 677 turns in a mile.

A BFG Radial All terrain 35x12.50R15LT/C does 599 turns in a mile.

That is a difference of 78 turns or 13% !!

If you think that difference won't cause wind up - sorry, but you are living in fairyland.
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Follow Up By: blown4by - Saturday, Jul 14, 2012 at 15:47

Saturday, Jul 14, 2012 at 15:47
I think what Bucky meant was that if you have 35's on one axle and 31.5's on the other you would have a problem but with the 10mm difference between his old and new tyres that is not much to worry about.
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Follow Up By: Michael ( Moss Vale NSW) - Saturday, Jul 14, 2012 at 17:00

Saturday, Jul 14, 2012 at 17:00
What Bucky said was if you are on the dirt, it doesn't matter a toss!! He is correct !! Michael


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Follow Up By: Member - Murray R (VIC) - Saturday, Jul 14, 2012 at 19:45

Saturday, Jul 14, 2012 at 19:45
Bucky & Michael
I'm not concerned about in the bush as I know there will be wheel slippage, my concern was on those long gravel roads that go no for miles. Had a mate with a Suzuki stockman that had new rear and 3/4 worn front and suffered wind up.
Who would put 31's on front and 35's on rear anyhow, just looking for trouble.
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Follow Up By: Member - Bucky - Sunday, Jul 15, 2012 at 06:09

Sunday, Jul 15, 2012 at 06:09
Girls
Settle down.

The original post said
"There's about 10mm differance in tread depth and I don't think i will have a problem. What is your opinion on this."

It's the same tyre, with new "full tread", only 10 mm difference.
And it's an opinion, not law !

Murray it will not matter.

Cheers
Bucky

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Reply By: Member - John and Val - Saturday, Jul 14, 2012 at 09:16

Saturday, Jul 14, 2012 at 09:16
Murray,

Just as Michael said above. Never use 4WD on a hard surface, unless it's a full-time all wheel drive. As also said above, don't mix wheel sizes on the one axle.

Cheers

John
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Follow Up By: Member - Murray R (VIC) - Saturday, Jul 14, 2012 at 19:48

Saturday, Jul 14, 2012 at 19:48
John
yes agree with that.
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Reply By: Member - nick b - Saturday, Jul 14, 2012 at 10:07

Saturday, Jul 14, 2012 at 10:07
Murray : To be sure you could try this , Take it for a drive in 4x4 them jack up just one wheel if it spin's then you may have wind up !!! ( start with just a short drive ) try this in different tracks ,road, conditions . The longer the drive the worse it will be , also if its hard to get out of 4x4 then you may have wind up .

good luck nick

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Reply By: Bonz (Vic) - Saturday, Jul 14, 2012 at 10:21

Saturday, Jul 14, 2012 at 10:21
Only if you put 35's on the rear mate.

But you could also put the two new tyres on the drivers side only and the diffs will take care of anything awry.
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Follow Up By: Member - MUZBRY(Vic) - Saturday, Jul 14, 2012 at 13:12

Saturday, Jul 14, 2012 at 13:12
Gday Murray
I would agree with Bonz on this. The difference between old and new is taken up with the differential, as that is its job. The two tyres that are worn are both from the same axle, possibly the two that drive the vehicle all the time. Rotate them more often old son front to back.

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Follow Up By: Member - Murray R (VIC) - Saturday, Jul 14, 2012 at 20:03

Saturday, Jul 14, 2012 at 20:03
Bonz
Sorry mate I disagree with different size tyres on one axle, the LSD in the ute is tight as you can hear it dragging a wheel on the black top on slight turn, so can see diff wear possible with the hyway km's I do if I did that.

Muzbry
Had to replace the 2 front as i got a boggy wheel alignment and realized to late and the damage was done. And yes I do rotate them every 20,000 km.
Like your new profile photo whats it like on the other side of the fence.

Murray
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Follow Up By: Member - MUZBRY(Vic) - Sunday, Jul 15, 2012 at 09:15

Sunday, Jul 15, 2012 at 09:15
Good morning Murray
All your problems came from taking Betty to the airport to many times instaed of coming with us to Dargo. How is your little darling anyway after the big trip. I just had a message from Wes , he is in the waiting line at Mascot on his way to Bali . I hope he doesn't bring back anything that he didn't take with him.

On the other side of the fence the difference is vast. The old Nissan was a small car compared with this monster. The toyota has a much better turning circle and more power and economy . I took out a personal loan to fill the tank before the trip ( 160 ltrs ) to Dargo and still drove around for a week after the trip.
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Reply By: blown4by - Saturday, Jul 14, 2012 at 15:54

Saturday, Jul 14, 2012 at 15:54
It is not the job on the diff to take care of different tyres diameters. The diff is there to take account of the difference in distance travelled by inner and outer tyres when cornering. Yes, the diff will take account of different tyre diameters but it will be working overtime to do this and with the diff working all the time to compensate for the different tyres sizes will result in premature wear of the diff gears and if the diff in a LSD the clutches as well.
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Reply By: Bill BD - Saturday, Jul 14, 2012 at 20:46

Saturday, Jul 14, 2012 at 20:46
Its a simple question - will a 10mm difference in tread depth make a difference when driving on gravel? 10mm difference in tread depth sounds like a fairly significant difference in overall circumference. Is it significant enough? I have no idea but think you will soon know when you try because it will be murder to get out of 4WD. If you have full time 4WD (where you can drive on any surface) you can usually slip it into that mode if you can't get it into 2WD (or I can with my XJ Jeep). That will get you back on the road. Do a short test run.
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