78 Series Troopy with clunking noise

Hi All,

After a piece of advice as to what I have broken in the Troopy. Went to the greens tip yesterday and to get the last branches out of the trailer, I took off quickly a'la what you see people doing at boat ramps to remove a boat off a trailer.

There was a clunking/grinding noise which sounds as if it is coming from the transfer case/ gearbox area. You can drive for a 100 meters or so slowly with no noise and then it starts again. The RAC don't know if it is the transfer case or diff and when it was towed to the mechanic's place (he is on holiday until Tuesday) I found that driving it up a small incline, the grinding was there again as if cog teeth were mismatched or slipping against each other.

I know that I will find out on Tuesday what it is but not knowing is bugging me and I can't work out why it will drive for a short distance without the noise.

It is a RV Troopy with factory turbo and tows a trailer (1.5T) three or four days a week.

Any ideas on what it could be?

Thanks in anticipation.

Cheers

Mark