Forrester gearbox noise

[timbo]

Hi all, I have a 99 2.0 litre Forester and it’s been a great car, and have 320K kms on it, but have bearing and then later a clicking noise in the manual gearbox. Have stripped gearbox and found that the centre diff’s rear retaining clip or circlip had come loose and chipped the transfer driven and drive gears as it was consumed buy the gears. I had the gears welded and filed, replaced all suspect bearings, the 4 transfer bearings and the front diff carrier bearings, all others seem OK. Back in the car clicking gone but bearing noise still there, stripped again and rechecked all bearings all OK.
Questions Can the centre diff type 2 cause a bearing noise under load on all conditions? Can any S/H gearbox with 8 bolt bell housing and high/low fit car, box now is SG-TY755XS1AA or only 99 year box? Me, Toyota mechanic. Thanks. Tim