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Hard to tell. Appears to be an iron t-case. Your third photo: Is there another plug on the back similar to the one shown? If so, it is likely a NP 205 T-case. If not, it may be a NP 203. Maybe post a couple more but not so close up.
1. First off is it a manual trans or auto trans ? 2. Take a pic of the pan of the trans and we can tell you, and take a pic of the whole back of the transfer case so we can see it. 3. What does your gear shifter for the transfer case have on it for gears ?
SM465 and 205.