how much will they take

Forgot to ask is the 8 3/4 stock?? as in stock axles,factory gears,stock pinion yoke,stock u-joints..if so you'll deffinately need to upgrade..i'm running Moser axles with a spool,nodular center section,4.30 gears,1350 billet yoke last thing i'm worried about is breaking the rear...by the way i've seen the "can handle anything" dana 60 grenade more then a few times...