Can you take the T-90 out without removing the engine or putting the truck on jacks?
Not removing engine yes.
Not on Jack's, I say no.
But where there is a will there is a way.
I tried to do it without pulling the shifters and that was a fail as well.
I will say a T90 D18 combo is super heavy, I picked mine up a few years back from off the back of a truck bed and was instant regret! It's awkward and heavy and you don't really want to drop a fully rebuilt unit. I thought it was much lighter then it turned out to be.
With zero experience here is how I did mine. Thus just came up on another thread.