New Guy Busted Rearend

[85 c-10]

Hello all. I am relatively new. Just been looking at all the info for a while. Over this past Winter, I built a 355 for the truck. I built this to take a 70mm turbo that I wanted to put on in June. Ive got most of the turbo parts except for the fule lines, and hotside parts. Engine consists of:

GM Steel Crank
Manley H beams
SRP Dished Pistons 8:1 CR
RHS 200 Aluminum Heads
Summit 282/292 .496/.520 114 LS
Edelbrock Victor Jr.
650 Speed Demon
Mallory 685 Ignition System

Anyway, after getting a new distributor, setting the timing, and getting the carb tuned in, 2 of my boys and I went for a ride. From a dead stop, I hammered it, truck got a little crazy and chucked an axle out. Now Im in search of a better differential. It has a mini spool now, and I hate it. Im looking for something that will handle about 600hp/600tq when I get the turbo on. Im really wanting a 9" b/c they're on every corner. I need help from anyone who might know what 9" matches our width on these trucks. I was told to get good axles, and a good differential for the 10 bolt, but thats more than a newer 9". So whats the concensus? What is a better road to take for a street truck. I don't want this to hook up b/c the truck is not setup to plant it. It will spin no matter what. Its a fun toy, not a drag truck.

Thanks for the input,

Josh Johnston