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What would be the edge limit for HP/TQ using the stock axles in the 8 3/4" rear? Currently I have a 489 case (West Coast Diff.) with only @ 3500 miles on it if memory serves me right it has the 1 7/8 pinion which they highly recommended. SS springs, otherwise the housing is the original unit...

My '70 Duster, pictured top left..I currently have the standard front disc, rear drum brakes, manual steering box. Of course, without saying the 70-72 kelsey hayes front disc setup sucks. Its expensive, and thats available is rebuilt at the parts stores. Nothing aftermarket that works w/sm...