Im building a sled puller and im woundering at what point in time do i need to move into rockwell axles? I have a 14 bolt rear now and i want to run pulling tires. will this axle live? the motors a 12v cummins, balanced, studs all the way around, fire ringed head and block, girdel, haisely truck pull cam, valve clearnsed piston, custom intake, 5x20s injectors. 13mm p-pump 5 grand rev kit. south bend iron gaint clucth with an nv5600 tran and a 205 t case.