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Which case do you have??

489 have a crush spacer it should be replace everytime you have the yoke off.



It is a 489 case.

The howling is more noticeable when decelerating. It barely makes any noise under load, but screams when you lift.

72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72. Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.