Although Randys ring and pinion does not supply a lot of drive line parts, they have one of the best articles I've seen written on drive line vibrations (see below)

Click here for the Randy's R&P article (Under General Information)

So I include a link to His site here, with reminder that we can do all the solutions he suggests plus, where he says a double CV jointed drive line is the only answer, (because rotaing the housings, especially fronts, is difficult) I say we can easily rotate that housing front or rear for you, plus keep any wheel alignment specs right on for you.