Turbo 350 won't shift out of 1st

[csb#356]

Ok, ive been having this problem for a while. I replaced the vacuum modulator then found out that the transfer case was in low. Put the t-case back in high but now it still will not shift. I tried shifting it manually but couldn't get it to but I don't know how high you have to rev before you try and shift. Someone told be that there is a little rod that goes into the transmission behind the modulator but when I replaced it I didn't see one. does this sound like a vacuum problem or a governor problem. Please help!