I disagree with Sun Tuned that the 9.3 is stronger than the 9". I have been racing Pontiacs since the 1960's and the 9.3 is the only rear end that I ever broke the center case. This was on a 1962 Catalina making maybe 375-400 hp, 4 speed and 7" (yes 7") wide M?T slicks. Never hurt the ring and pinion just the case.
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