You might as well pull the center diff out too since your in there. It could still be pooched. Pull it out and open it up or check for broken seized spider gears, spin it and check the operation of it.

1G DSM: 1000+ AWHP, 9.2@162.83 MPH
Evo X: 746 AWHP, XR9569S pump gas
www.dynotuneracing.com