we went to a S60 from Dr. Diff after we continued to twist axles and knew with the power we were putting down (launching off T brake 3800-5500) that the "set it and forget it" route would be the D60. I do like to play with combinations, and it would be much easier to set up complete 9" center sections, but it is what it is. So far I have 4.30, 4.55, and eventually I'll set up my 5.13's too. Once you have the shim packs changing gears is no big thing..... however, set up on your back in the garage..... not so fun! At least the S60 has side adjusters instead of the shim packs like the stock units.
