I think housing flex is the reason for cap breakage in a lot of cases.
What's your theory on why that is? How does housing flex, let the pinion move away from ring gear?
Im not arguing your point Monte about the case having flex. But I have experienced caps breaking in an old 4spd truck I had with a 489 from doing Ronnie Sox impressions and the ring and pinion was still useable. I agree with Cass, I pointed my finger at housing flex in that case. Severe housing flex turns the axles into prybars against carrier and pops the caps.
