bullet recomemded a 373 gear for my turbo car.. but it also revs to 8500... you shoulda went with a 9 inch.. a turbo challenger here in town went through 3 8 3/4 center sections.. went with e 35 splined n cased 9 inch never broke again..
these 489 8 3/4 will go through the center section if you don't install a crush ring aliminator in them thats one problem they have when you start romping on them the pinion keeps getting looser with out that kit