Depends which year your L322 is.
The earlier New Venture Gear NV225 transfer box (used with the ZF 5HP24 and GM 5L40-E transmissions) uses Castrol BOT 26 FMB1 fluid (1.0 litre capacity).
The later Magna Steyr DD295 transfer box (used with the 6-speed transmissions onwards) uses Shell TF 0753 fluid (1.5 litre capacity).
Phil