broken rear dana 60

[69CvyPickup4x]

yesterday i was takin off and i reved up the motor pretty good and dumped the clutch and didnt have good results.. i gotta a chirp out of the tires and a snap ping from the rear axle and that was that. I think i snaped an axle shaft, but not quite sure yet, ill find out later today if the rain doesnt keep up. I put it in gear, let the clutch out and the drive shaft turns and i get a thunk....thunk....thunk....thunk.. from the rear axle on the driver side. and the truck does not move absolutely anywhere.. The rear is from a 72' c20 with leaf springs has 4.10 gears and a limited slip. Im running a mild cammed 454 bored 60 over, with a sm465 tranny and 35" mud terrain tires.. I was kinda surprised i broke it.