Didn't get any satisfaction from Trailblazer Forum. More experts here, so I'm fishing for help.
2003 Chevy Trailblazer 6cyl 4WD LS Starts vibrating through the steering wheel and can feel it generally at about 30mph and above. If I let off the gas, the vibration stops. It is a rust-bucket on the bottom side, but the universal joints "look" OK. I don't feel any looseness, but that doesn't guarantee anything. Any suggestions as to isolating the problem i.e. rear end, transmission, drive shaft?? It shifts O.K. in 2 wheel, 4 wheel high, 4 wheel low.