I had one guy tell me a 6.2L is doomed when bolted to an SM465. Claimed the wide ratios in the tranny make it lug, putting extra stress on the crank, causing the crank to eventually break or cause main bearing failure. He'd never seen a snapped crank with an auto, and, as a trend, seen much higher miles with an auto. /forums/images/graemlins/shocked.gif What's the verdict guys? Is he speaking from his backside? /forums/images/graemlins/tongue.gif Personally, I think his reasoning is flawed. I think it has more to do with driving style, and that sm465/6.2L combos only came in pickups - most likely 1-tons that were probably used beyond their capabilities.