Rear diff noise?

[Rsnash]

Hi I've recently bought a restored big turbo escort .it's had 95% of it's parts replaced with new.its done 88k and I'm getting like a grrrr noise on lift off over about 30 or 40 mph .which sounds like it's coming from the rear .it's had new wheel bearings all round etc and since rebuild has only done a few hundred miles .any help would be greatly received.

[the youth]

could be the chain in the transfer box that can wobble about when slack as the car comes off load

Steve

[The Radman]

does the noise go when you press the clutch down? and does it only do it at the speed you mention. ie does it do it at 60 or 70 etc or if you lift off is it quiet until the speed drops to 30/40 then it kicks in?

[Rsnash]

Yes the noise goes when the clutch is pushed in and it still does it at higher speed.but maybe not as loud? The rear diff gets hot with normal driving aswell

[Gensc]

Following this. I have the same problem, whenever i am on engine brake there is a harsh noise coming from the mid-back of the car. Only while on engine brake though.

Rsnash please let us know if you find the source of the problem.

[garet]

stick go pro camera on the back....i did it on mine...at the end ,it was the exhaust pipe hitting the fuel tank...

[BillyEdmonds]

I had the exact same symptom with my car. Was driving me crazy.
Turned out to be the rear sway bar touching the the upper mounting bolt of the diff. I ground a tiny relief in the sway bar & it cured the noise completely. When I say ground a relief I mean I just barely touched it with a grinder sanding disc.

If you look at the mount upper bolt you'll likely see it rubbing against the sway bar.

[Rsnash]

I'll have a look thanks

[Cossie col]

Nice car fella, get some pics up

[Rsnash]

Here she is at fordfair

[Rsnash]

I had the exact same symptom with my car. Was driving me crazy.
Turned out to be the rear sway bar touching the the upper mounting bolt of the diff. I ground a tiny relief in the sway bar & it cured the noise completely. When I say ground a relief I mean I just barely touched it with a grinder sanding disc.

If you look at the mount upper bolt you'll likely see it rubbing against the sway bar.

There is a couple of slight marks on the sway bar it won't let me upload it .I'm going to wrap some tape round it and go for a drive and see if it is rubbing

[twin turbo]

How hot does the diff get? If gets very hot, something need check...

[Rsnash]

How hot does the diff get? If gets very hot, something need check...

It does get hot .checked it after normal driving and it was hot

[Rsnash]

does the noise go when you press the clutch down? and does it only do it at the speed you mention. ie does it do it at 60 or 70 etc or if you lift off is it quiet until the speed drops to 30/40 then it kicks in?

The noise stops when I put the clutch down and it doesn't seem as bad at 60 70 mph

[The Radman]

it could well be the clutch if you have an after market one fitted,i had same problem on one of mine once,changed the diff and all sorts,id ruled out the clutch as it was a new ap item but i was told by someone i know who is an expert to change it for standard item,seeing as i was only running 300 bhp and a standard clutch was ok for that i fitted a gen motorcraft one and problem solved instantly