This came up recently,iirc fwd internal concentric slave/thrust bearing, easily seen if external type anyway.
Copper slip and a lump hammer and you'll be just fine!
2007 t350 lwb m/h 140 goes like stink!......for a bit!
2000 t350 lwb m/h 90 big red reliable all is forgiven!
1994 swb l/r 2.5di 80 nice consistent drive and lovely Gearchange.