rearend size

i just bought the old schoolu dually..and need to change the rear setup..and just wondering if anyone knows the size of the stock rearend on the 99 3500 chevy..with the 454..need bag over axel brackets..any help would b great..thanks

congrats on the purchase! definitley one of sickest duallys out threre...

as far as your question.. what exactly are you trying to accomplish? what bags are you putting in, etc

some details would help...

and some pics would be nice too.

I can post pics in a bit. But I plan on bringing this thing back to life. It's still awesome. But Definetly needs some work. So I just ordered a set or 22" American force rims. Which I'll post pics of also. But right now it has bag on bar. And I plan to pull with this thing. So I wanna go bag over axel. And do the bridge across and do a gooseneck plate. And from what I hear bag on bar is horrible for towing. And I'm just trying to find out the diameter of the rearend so I can order my brackets and get it goin. Also putting a hidden hitch on also. I'll try to get the bed off soon and I'll get alot of pics