Diff Woes - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

GT BLOKE · 05-29-2002, 15:50

I have a problem with the diff in my EB GT.

After about 15mins of highway speeds nasty clunking noises come from the diff when I slow down to about 40ks and under.

It doesn't do it just putting around town. As the car only does about 10k's a day, the first time I heard was when I took it out of town for a service. The Ford guys said to change the oil as it only happens when it heats up.

I did that and the noise still prevails.

Does anyone have any ideas or am I up for a rebuild.

Thanks in advance,

GT Bloke

XR8XTC · 05-29-2002, 23:28

Let me know how you go, in my EB XR8 sometimes when i am slowing from 100 kays just as i am about to stop at a set of lights my diff will clunch a couple of times. I am thinking about dropping my diff ratio so the centre would be replaced but incase i dont go ahead with it i would like to get 2 the bottom of the problem.

Martin · 05-29-2002, 23:35

Mine did exactly that too, found out it was because I was still driving with the spare which was a 205/65/15, the other tyres are 215/60/15.

When I finally got the correct size back on there it stopped doing it.

GT BLOKE · 05-30-2002, 00:02

Martin,

I've cheched the tyres and the P Zeros are same all round.

I think I will have to find a good diff doctor

shaynet · 05-30-2002, 03:25

What type of diff does a EB GT run?

OUTBACK · 05-30-2002, 06:02

Speaking of diff bits.. Does anyone have borg warner 3.89 : 1 crown wheel and pinion ? Doesn't matter if they are a bit noisy as they are for a speedway v8

Great White · 05-30-2002, 06:21

It could be that one of your hemisphere teeth are chipped or a tooth broken. The little bit is now floating around inside the diff and from time to time is getting caught up between the ring and pinion. For your sake Im probaly wrong though.

Futura97 · 05-30-2002, 06:44

I'm starting to get the same problem, but its in an XF. I found out that its just the rear brakes. When you put the brake on, the noise goes away, release the brake and it comes back.

Could be worthwile just tap the brakes and hold it and see if the noise goes away. Might be the brakes??

Anyway im gonna fix mine tommorow. Just a loose bolt i assume.

Cheers
Matt

GT BLOKE · 05-30-2002, 20:07

Shaynet,

Couldn't give you exact details at the moment but as far as I know it's the same LSD as found under EB & ED XR8s

RichardXR8 · 05-31-2002, 05:13

The EB XR8 had an LSD as an OPTION - it definitely wasnt standard.......... Not sure about ED.
Maybe its the clutchpacks grabbing ?? Are you using LSD diff oil of "proper" spec ?? There is an additive available for LSD diffs to stop chatter, but the chatter is usually when cornering slowly eg U-turns. Is the noise there/worse when doing slow small circles ? (NOT donuts !!)