Do not know what the life exp of the GT are, but everyone I know that has one (which is not that many to be honest) has had problems. Mine developed cracks in the worm gears, at which point it was put on the shelf. Did not want to have the same experience as Eddie and have it blow out while on the highway. The R&P gears, which are stock MB parts, do not seem to be the weak link, only the worm gears. Some of us were looking into having new worm gears made but so far I do not know of anyone getting this done yet. GT's are great diffs, but only while they last.
Dave
'87 560SEC AMG Widebody - 49k miles
Dave
'87 560SEC AMG Widebody - 49k miles