Salisbury Diff noise - clunk/twang sound when rolling backward then moving forward

[86mud]

Hi All

Vehicle is a 1998 130 HCPU with 299,000kms

Sometimes when I roll back at traffic lights then move forward, I hear a twang like noise out of the back diff. It reminds of the noise I used to hear when I was learning to drive in an 1969 MGCGT which had splinned knock on hubs and my dad always said there was some play in the splines.

Anyway, some history - I had an ARB locker installed in the rear diff exactly 5 years ago. At the time the locker was installed, the rear axles were what I was lead to believe to be Bearmach "upgraded" axles. I was also using Bearmach heavy duty drive flanges. I was always worried about these axles so about a year later I purchased a set of maxi drive axles and drive flanges.


Now over time I have this noise. It is not there all the time, only in the scenario mentioned above - when the weight of the truck moves backward then forward.

I have removed and inspected the axles and the splines look fine with no signs of wear at either end.

When I jack up the car and rotate a wheel, I notice a lot of slack in the diff.

Could I have somehow warn the splines inside the locker or could it back lash in the diff or could it be crown wheel/pinion wear?

I just rang ARB who originally installed the locker and they told me to go to a diff place.

Can anyone recommend a diff place on the southside of Brisbane or will the likes of MR Automotive be about to advise?

Thank you

[wollomi1962]

MMMMM. Just a chance, but how do the Unis look ?
I will watch with interest. Good luck.

[86mud]

Uni's are ok. They were checked just recently after changing the rear diff pinion seal.

However, they are on the list of things to change before I head for the Cape in June.

I've just booked the truck into MR Automotive for them to check it out....but they are book up a month in advance so will have to wait until 5th March

[Hools]

Check your a-frame ball joint. I had a noise which sounded like it was coming from the diff. Turns out my ball joint was flogged out.

[86mud]

Sorry yes, should have mentioned that - A-frame ball joint as well as the A frame bushes and bolts all checked and are ok.

The worry is that when I jack up one wheel, there is an excessive amount of play when I turn the wheel - which leads me to think that it is caused by wear in the splines in the ARB locker

[Ancient Mariner]

When you rock one wheel back and forth check the pinion is not moving

AM

[Duarte19]

Hi All

Sometimes when I roll back at traffic lights then move forward, I hear a twang like noise out of the back diff. It reminds of the noise I used to hear when I was learning to drive in an 1969 MGCGT which had splinned knock on hubs and my dad always said there was some play in the splines.



I had similar symptoms

LT230 Clunk (https://www.aulro.com/afvb/technical-chatter/225643-lt230-clunk.html)

[swaggi]

i saw a friends 110 county making strange 'whacking' noises from the rear diff a while back.
we looked into it and he had drive to all axles.... then after we removed the long axle we found it had a lengthwise break. most of the time it had drive and then would, i spose, slip a revolution and realign itself for further drive

[Tombie]

And of course the axle shafts.

[uninformed]

And of course the axle shafts.

1st post:

"I have removed and inspected the axles and the splines look fine with no signs of wear at either end."

[Tombie]

1st post:

"I have removed and inspected the axles and the splines look fine with no signs of wear at either end."




Apologies. I missed that for some reason...

[uninformed]

Apologies. I missed that for some reason...

all good, im curious on this one??

[justinc]

That twang is usually associated with pinion drive flange not being tight enough. If it was loosened a little it wouldn't do it and if it were tighter it wouldn't do it. The giveaway here is that it happened after the pinion seal replacement 😎. There was a bulletin about loctiting the pinion on to the p38 diff on the later td5 defenders due to this kind of noise if i remember.

[86mud]

Sorry JC, the twang was there before the pinion seal was replaced (and I did loctite the flange nut when it went back together)

I can't do much about it until early March so thanks for all your replies and I'll let you know the verdict once it gets pulled apart.

Cheers

[Duarte19]

Sorry JC, the twang was there before the pinion seal was replaced (and I did loctite the flange nut when it went back together)

I can't do much about it until early March so thanks for all your replies and I'll let you know the verdict once it gets pulled apart.

Cheers


JC means loctite the splines with a bearing retainer, check TSB LD205-002 and my earlier post