I've been running a HP D30 / 29 spline 8.25 with 35's for several years now. 4.56 gears, alloy shafts, e-locker in front and Detroit in the rear. I wheel it fairly hard, but I always keep in mind I'm on "stock" axles with 35's, so I'm light on the skinny pedal. So far, no issues with the D30...