Been working on all sorts of areas on car. Tightened up some exaust leaks, added a couple hangers after changing out old glass packs to some walker mufflers , tweaked the pipes a bit where they were touching frame. Notices the top of trans was touching the floor and fixed that . Replaced control arm bushings and strut rod bushings . Replaced front shocks , noticed last installer left off lower shock rubber bushing and washer, shock was loose. Replaces u joints on driveshaft and noticed there was no Balancer weight .Could it be he never balanced drive shaft? Not sure but I don't recall ever seeing a drive shaft without a weight, have removed many but in all honesty probably didn't look too close at all of them. Still hage some minor viberations . Think I will get driveshaft checked .