I think new would be better, just because it's new, but many people use used parts. If your going to have the 9" ends put on so the seals dont leak you may want to look at the Superior axles supposedly they will not leak with the c-clip elims, and you should have the tubes straigtened and welded whilt is all apart. Currie does sell complete rears but it will cost you $2500 minimum. I getting ready to do my rear as well, but I am getting the Drivetrain DirectPackage that includes-31 spline Superiors, and a Eaton Posi $579, then re-using my stock housing which I will have welded and straightened if need be. All the new bearing run about $80 from D&D or Drivetrain Direct.
www.drivetraindirect.com
------------------
Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC exhaust 1-5/8" Long tubes,2-1/2" O.R H-Pipe,2 1/2" cat back, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension,S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!
FIRST TIME OUT 12.16@111 WHEELS-UP