New Venture Gear, the manufacturers of the NV-T350 only recommend either the Mopar NV-T350 specific fluid
or Chrysler ATF+4
. If you use anything else, the results aren't guaranteed to be good, but to each their own. The seal is about $13.XX at the dealer.
OEM # 04797334
To ensure any doubt of anything.
2GNT.com - pnc
As for replacing the an "Axle Seal", it is simple & straight foward. Get to the C/V shaft, remove it, I use small needle nose pliers to remove/knock out the seal & replace with new one. I use a rubber hammer/wooden block to push the seal even against the slot. Put everything back together as you tore it down.