Mk1 strange noises

[sdenny]

My brother in law has a very nice restored Mk1 that he's somewhat frustrated with. There's a funny noise. His description:

Metallic noise very easily heard but only in top gear but only between 3000 and 2,500 rpm on overrun. If the clutch is dipped or the lightest throttle load applied the noise disappears.
In summary car bought as a restoration project. Engine, gearbox and axle rebuilt by Lotus specialists. Three different diffs and propshafts have been tried. Two complete rear axles been used, drums balanced and half shafts swapped out and numerous thrust release bearings and carriers tried.

As you can see, he's tried lots of things to fix it - any body got any other suggestions as to what it could be?

Thanks in advance

Steve

ps I also have this posted on http://www.lotuselan.net, so if you've replied there, thanks very much

[Rob]

The bush in gear linkage often gives out a strange metallic buzzing noise
(Directly under gear stick)


Rob

[Keith Halstead]

Prop shaft UJ ?

[Pete G]

Any idea where he noise is coming from, prop, rear axle, gearbox?
If it is only in 4th gear and none of the others whatever the road speed, it would suggest gearbox?