I've got motive 4.56s in my 9.25 axle under the big block dakota. just got it back on the road, so no longevity input yet, but so far, I like them. a tiny ringing or "tone" comes from them at part throttle cruise and light acceleration...anything more than light acceleration, and I can't hear it because the engine noise drowns it out.

quick and easy break in so far, they've got maybe 200 miles on them?

I like them. I picked up the entire install kit from Moe's Performance, he had the best price AND free shipping