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Loud Knock in rear end.

Jackos94

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It started today at intersections when taking off i would hear a couple of loud bangs in the rear, at the time i thought it was a backfire.
Then later this arvo the rear started playing these huge knocking noises when sitting at roughly 5-10km/h i haven't been game enough to go any quicker as the knock is vibrating through the whole back of the car.
I can drive it roughly walking pace with no sign of a knock and also in reverse the knock doesn't seem to show.
I'm assuming something either in the rear axle/diff if anyone could enlighten me.

To explain the sound it just sounds like metal on metal clunking, that you would hear from 500m away. lol
 

woteva

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Could be Tailshaft centre bearing and also check uni- joints.

Is it VR or VS ?
V6 or V8 ?
Solid rear axle or IRS ?
 

Jackos94

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Its a VS v6, Im assuming its IRS it was an ex ambulance Ute.
 

losh1971

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If its a ute it will most likely be live axle.
 

losh1971

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My guess is it's the centre bearing. Pretty common they begin to crack and if left too long they go bang. Mine did and it trashed the shaft. I bought a SH one and had a new bearing fitted, along with new uni's. If it's slapped around a bit then you will be best to grab a SH one and have it rebuilt. The smacking around can make it out of balance and it could fail again, unless it's rebalanced but that works out expensive.
 

woteva

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Its a VS v6, Im assuming its IRS it was an ex ambulance Ute.
As losh said, it won't be irs on a ute.
Yours is a stretched ute being ex ambo ?
Jack up the rear and check for play in the tail shaft. The centre bearing is more towards the front and on the next bracket behind the trans mounting.
 

Jackos94

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It’s on the side of the road so will check in morning, might be able to limp it home but afraid it will do damage might have to get a trailer.
 
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