The T18, T19, and NP435 are all four speeds with granny low. However, they came with mechanical clutches, which would make it additional work to use with a hydraulic clutch (if it's possible, I'm not sure).
The T5 is a five speed, again with a mechanical clutch. To use this with a transfer case would require finding one from a Chevy S10, or at least adapting the output shaft to another T5; or you could run a divorced t-case setup; or find an T5 to t-case adapter that Advanced Adapters used to make.
Incorrect. i know for a fact that the NP435(atleast out of an '87 F-150) has a hydraulic clutch setup. I have one

everything else is correct i do believe. i have i link i found while surfing the net one day about converting the T5 to 4x4...let me dig it up an ill post the info up... maybe someone can get some use out of it

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