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At 11.90 ETs an 8 3/4" ring and pinion needs to be replaced every 100 passes.

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Huh, I guess my 8 3/4 didn't get that memo.

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I was gonna say the same thing!!!!
My 63 Dodge had hundreds and hundreds of passes with a best of 11.63, never even looked INTO the diff!

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My 1963 Plymouth M.W. stocker got hundreds of runs on the original 4.56 OEM gears, they never broke Most after market gears are not so good OP, as already said, how lucky are you feeling?