Transmission noise

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There is a heavy clunk from the rear of my Bongo when the transmission takes up. E.g, when I go from forward to reverse or vice versa or when I put it into drive and move off. I think that this only or mainly occurs when it's warmed up (but mu wife's not so sure). A mechanic says he can't see anything externally. Any ideas anyone?

[mikeonb4c]

I tend to keep my foot on the brake pedal when selecting D or R from N in order to minimise any clunking. Do you do that / have you tried it? I think its considered good practice. I've no problems of note other than that. Oh and my front brakes may a noise when I change direction from forward to reverse then apply them, buts thats just the brake shims and nothing to worry about.

[Dolly1]

Sounds like prop shaft u/j coupling is knackered

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Thanks guys

I thought the prop shaft myself but a mechanic said it was ok. I think a second opinion is called for!