sapper:
No leaks, 185943 kms on the clock
Sapper
Clearly shouldn`t be happening at that kilometrage. Have you dropped the oil to check for metal filings? Check quantity/quality at the same time of course. I had one vehicle (not a truck) where a totally unsuitable grade of oil was put in the gearbox. Wrecked it. If no luck either get the spanners out, or treat it as a crash box. Slightly longer changes but a lot cheaper!
EDIT: would using it as a crash box would then make it a Grand Dad box?
Sorry.