9 inch was always the stronger rears. They have their pinion down lower on the ring that gives much more tooth contact. They also have the small support bearing on the nose of the pinion.
Also, you can pop the pumpkin out to change ratio's easily.
Be it a 8 inch or a 9 inch. They should both take off the same with the same gear ratio and tire size. 9 inch is heavier too.
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