How knows??
 

:confused: I have a vibration in the engine of my '72 Grandé. At a local USA car garage they told me that there was something wrong with the 'flex disk' it should be located between the engine and the transmission. I own a repair manual and I can't find anything which is comparable to and 'flex disk'. (They did not mean the torc converter or the balancer at the front of the engine)

Does anyone know what a 'flex disk' could be????

Niels

From the description I would swear they are talking about the flex plate. The Flex plate is the automatic transmission equivelent of a flywheel and attaches the torque converter to the crankshaft. It also has the teeth for the starter to turn against. I think the reason they are not called flywheels is that they don't have the mass of a flywheel, but that is just a guess. Not sure what to say about their diagonosis? I have heard the flex plate can become cracked and I suppose that could be the problem.

the flex disk
 

I am not sure if they r write on their diagnosis, I would say it is a possibility, but when they said "flex disk", sounds to me like they meant the flex plate.
Ryan

Your both probably right, it's a flex plate. The literal translation (from dutch to englisch) is flex plate, I thought it didn't sound right. Could it be that the repair manual used an other name for the flex plate? If you have a picture of the flex plate could you attach it to your reply?

Niels

a picture
 

here is a pic, not sure how this is going to turn out on the quality, but should help.
Ryan

It could definitely be the flex plate, or in this instance could even be the harmonic balancer if the engine you are talking about is a small block. As far as I know, all ford small blocks are externally balanced with the harmonic balancer and flex plate (or flywheel depending on the application), so if either of them has somehow been disturbed, the engine could very well be out of balance and the source of your vibration. That's my $.02, hope it helps!

Engine?
 

Are you sure the vibration is coming from the engine? Does it do it reving the engine in neutral or only when your driving at speed? The most common source of vibration for me has been bad u-joints. That would only be apparent when driving at speed and not when reving in neutral.

Rev

driveshaft
 

i had a bad vibration, but mine was only in overdrive....machine shop said I actually hit something with my driveshaft, and tweaked....something else to look at
Ryan