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looking for a 8 3/4 posi chunk for my challenger I have a 3.23 posi in it right now but would like to have one I can switch out when I go to the track .I am looking for one in 3.91 or a 3.73 gear set 489 case would be awesome but I have 741 case now and have no problems with it and my motor makes 450hp at the fly