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

[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."