I've searched and found a topic from Oz, describing similar symptoms, which turned out to be an out of balance tail shaft.

I don't know what/where a tail shaft is...

 

its located in the secret compartment

 

in all seriousness though... probably the prop shaft

 

I did consider that, but surely everyone would just refer to that as a propshaft!?

But lets say for the sake of argument it is the prop shaft - Can they be rebalanced or is it a new part?

 

It would; a tail shaft is pretty much what it says on the tin.

You'll find one in front of that, in the back of the gearbox between the return gearset (the one that runs dry & whistles, apparently) and runs under the shift tower.

Perversely, you can also find a forward-facing tail shaft in the diff, when an elongated torque tube is used for live axle location. Opel did that with fair success for a number of years.

 

Lets say, for the sake of clarity, that I'm illiterate and cant read "the tin". Could explain what the tail shaft does? I'm not sure if you're agreeing that it probably is the propshaft (in which case you don't need to explain what it does) or if you're saying yes, there is a separate tail shaft.

 

I think what he's saying is that the prop shaft is the thing that connects the gearbox tail shaft to the diff tail shaft.

 

http://holdenpaedia.oldholden.com/Tailshafts



I's the old bonnet, hood, fender, lug nut, rotor, trunk think all over again, a general bastardisation of British engineering terms by countries who think they speak English, in this case Australian, a tailshaft is technically the back end of a boats propeller shaft.

 

The tail shaft (of any piece of powered machinery) is the last shaft in the series. The shaft farthest from the power source. The shaft that sticks out the back of a transmission. The shaft to which the propeller of a boat is attached. Etc.

-- Chuck

 

When my propshaft failed, the symptoms I suffered where: clunking in gear changes - prominent in first and reverse.

It feels like the diff is about to be ripped from under the car.

Second hand prop for a fair price solved that. I dismantled the old prop and found that the lube in the UJ's was no existent and what was there was Nutella.