Danny555

Hello everyone

I'm hoping someone has had the same symptoms as me.

Right my car is a 2wd sapphire Cosworth and at around 70 onwards I get a really nasty rumble, vibration coming through my car! Almost feels like the gearbox is going to fall out. It's rumbles through the gearstick and all over the car to be fair. Getting to the point I don't enjoy driving it anymore.

What I've done so far is refurbished all my wheels, new tyres and balanced. I have had the gearbox re-built and the propshaft doughnut changed and checked. Plus a good Standard gearbox mount replaced.

My next point of call is the driveshafts and diff

I hope someone has had this and can tell me what it is
Thanks

botters

iTrader: (2)

check the differential mount

gingerturbo

iTrader: (2)

Check the cv joints in the shafts too, do you get the vibration still out of gear?

RSMK4TURBO

Mine was shaking and vibrating through cabin and gearstick when car was coming on boost, turned out to be the engine mounts. Check you exhaust isnt fouling underside of car to.

Danny555

I had it up on the ramp and put a transmission jack up on the sump to check the mounts. Not a lot of movement and I couldn't see any splits. Plus I checked the diff mount too.

I haven't had the joints checked yet so will take the shafts out and check that during the week.

Danny555

The rumble goes out of gear and a slight vibration at around 2,500rpm but is worse under load.

gingerturbo

iTrader: (2)

Did you check the spigot bearing in the flywheel when you took out the box?

gingerturbo

iTrader: (2)

Also is it a 2wd or 4wd

Danny555

I didn't think to check it mate. But the engine was re built last year and the flywheel was re faced and checked.

Danny555

Sorry it's 2wd

gingerturbo

iTrader: (2)

Also a slightly sized up rear calliper could cause this, really odd? Hope you get to the bottom of it,
Did you get the propshaft checked to see if its balanced

Danny555

I had the prop checked when I did the gearbox.

I will strip the brakes tomorrow and check them.

Thanks mate

costina

iTrader: (1)

Any updates with this?

Danny555

Just a small update

I've now replaced my exhaust with a better fitting one.

I removed my driveshafts and replaced the joints with new ones so they are nice and tight now.

I changed my diff with my mates spare and still now joy!

My next thing I will try is I will remove my prop and get it balanced.

costina

iTrader: (1)

Is your prop in line and do you have spacers under the centre mount ?

Also check your turbo damper.

Danny555

It looks ok to me mate and it does have the spacers on it too.

I've uprated the turbo damper with a AS one

gingerturbo

iTrader: (2)

What bushes are you running on the rear? And have you got poly spring bushes, if its not a rotation issue then you need to look for a shiny part of your shell where something's rubbing
You seem fairly clued up, the box isn't touching the tunnel is it?