we would weld the spider gears together in an open carrier in our Cutlass circle track car that had the 602 crate in it and that rear never had a problem except the right axle would break from the stress of the cornering. Guys would also break an axle if the ended up in tjhe infield and hit the gas pedal too hard and the tire that hit the pavement with other wheel spinning on grass an axle would sheer most of the time.