Started out thinking the fwd/rev clutch pack had gone.After some research and draining the transmission oil revealing bits of bearing we have concluded there is a bearing gone in the gearbox,dealer foreman confirmed they have done several,not sure why as it is on the bottom shaft running in oil all the time.Big job as the whole back end has to be dismantled.Bit disappointing really as only 4300hrs,and this transmission has been around for about 30 years going back to Fiat days,albeit in less powerfull tractors,obviously at its limit with 115hp.Just wondering if anyone else has had the same problem,up to now ive always been told these tractors are pretty bombproof.