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  1. D

    489 w/power-loc ?

    Yes. 8.75" (Power-Lock) clutch sure-grips are the old stand-by for a street/strip application.
  2. D

    489 w/power-loc ?

    8.75" Power-Locks were originally made by Dana/Spicer. They are the same design as the Dana 60 version, but smaller to fit the 8.75" ring gear.
  3. D

    8 3/4 goes boom

    I stock a thick, nodular iron 489 casting made with the same forged steel caps found on a 9" race case. This super duty 8.75" casting helps, but unfortunately, the 8.75" ring gear diameter and tooth contact area is not large enough for a heavy, torquey application.
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