Thankyou all mounts are good and I have replaced the centre bearing as the rubber there was a little soft (bearing itself was ok ) have put a jack under the rear mount to test if it was moving but all tested ok. In the morning when it is cold it is pretty good it only gets bad when it warms up even if you are driving up the highway and not using the clutch.Whilst i had the tailshaft out checked the uni's and all good. So perhaps I will take it back to where i got the clutch replaced as it has only done nearly 30,000kms since it was installed. I could live with a little chatter on take off but it has gotten to a stage that is pretty hard to take off.
Kind regards. Jim Prentice
Ps. are you in Brisbane or elsewhere? I am in Perth. Can't remember the model and type of clutch they put in but will try and find some paperwork.
I got a F Truck specific workshop to do the clutch as they had a hoist that would accomodate my 250.