Just my 2 cents when everyone is giving you spare change.
Upon further consideration, I don't think you have driven the car enough for it to be a chassis flex issue. But with you trying to see what the axle would stand a 2nd time, you might have snapped the housing under the load of that might Small Block Chevy you have in there. The rear axle is really just hanging there and the CV or U-joints will handle any misalignment pretty easy. My guess is that winters might have the same factory in China make their axles and cast their center sections. Currie makes a nice Independent suspension center section.
Or that tame looking small block with painted cylinder heads is really a Nascar Cup engine. And those super all weather tires might be really sticky.
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