here's the situation my truck is on toy axles has a toy front shaft in the rear and had a 4to1 tcase. Well a bearing went in the case so i figured i'll put my stocker back in till I get it fixed. Only problem is NOW i get vibes and i didn't before. used the same arms, same everything but i can't seem to shake the vibes in the 70-100 km/h range? what could it be?

If it wasn't a CV rear shaft I would guess you took the drive shaft apart and put it together out of phase. Are you using adapters to connect DS to the t-case? Could it be off center?

i'm using rat adapters, i never took the shaft apart but i suppose that would be a good place to start huh