I just read in the 05+'s you need different fluid weights for front and rear diffs. I have no idea for the 04 with LSD rear.
I know I am not much help!
Rear final drive oil
C200
3 3/8 pt
API GL-5 Synthetic 75W-90 Gear Oil
(Part No. 999MP-DF200P) or equivalent *6
M226
4 1/4 pt
API GL-5 Synthetic 75W-140 Gear Oil
(Part No. 999MP-DF100P) or equivalent *6
Front final drive oil
1 3/4
API GL-5 Viscosity SAE 80W-90 *7
*6: See your NISSAN dealer for service for synthetic oil. ?SYNTHETIC OIL ONLY? is embossed on the M226 carrier cover.
*7: For hot climates, viscosity SAE 90 is suitable for ambient temperatures above 0? C (32? F).