fitted the Nolathane front bushes yesterday about 2 hours not overly hard. no vibration at all no difference at all. as for balance issuses with the forward shaft I cannot see how you would get any and as for balance would think more a tyre problem as it is a complete assy drive shaft hub brake and wheel. not sure if the way the original bushings are timed or not however I placed them in the same position as they came out. if you where to place the original type press bushing in I can see the length of time it would take to install and the cost involved in carrying out that job. and before anyone says about balancing I am an aircraft engineer and balance aircraft props and helicopter main and tail rotors using specialized balancing tooling far more technical than found in your local car workshop down to less than a gram. the test will be at the end of the week will have a 1500km drive down south via country queensland and nsw roads. best thing about the Nolathane bushes is all you need to remove is the wheel and diff bushings and attach bolts I didn't remove brake rotor or calliper therefore nothing was disturbed in the drive train at all.