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Originally Posted by Voodoo96743
If this is to become the official gears sticky, may I suggest adding info about what degree of rebuild kits would be needed at various mileage, what misc parts are needed (I recall some sort of special pin or grinding needed with 4.56+), etc.
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with 31 spline differentials, you get a thicker cross pin; and also, with steeper gears, the ring gear will be thicker, to the point the teeth of the gear will cover up some of the real estate needed to put in/take out the cross pin. I don't believe all 31 spline differentials offer similar thickness pins, so you might be able to slide by with some.
The Ford 31 spline traklok needs to have the pin ground to be able to fit 4.30s or higher on there. I believe same is the case with the Torsen differentials. Not sure about the eaton or auburn ones.