Everyone has their own experience. I ran a 9" in a 3000 lb street ElCamino with 31 spline axles, M/W aluminum bolt thru center section but the housing was stock. NO modifications. Very stout 700+hp small blk and 300 in the fog, 1.30 60', 5.62 1/8th. Not to say there won't be, but so far no problems but axles are showing some twist.
HOW LUCKY DO YOU FEEL...