I'm in the same boat I got eibach stage 2 coilovers with rears and cognito UCA'S, I had the same question about diff drop I called eibach he said he thought the coilers came factory set 2.5" and did not think diff drop was needed .I said I wonder if its good for 3' I think that's what I need but could not get a good answer on that height from him about cv angles. so ill watch this tread see if you get input.