You said you spent half the day getting it to move, how did you do that? Did you remove the center console?
I recently installed DI CDL shifter in my DII. I got the shifter from a wrecking yard, & the owner of the truck it came out of must not have ever used it because it was totally siezed. I clamped it in a vise & soaked it with penetrating oil. After a while, it began to free up a bit. Over the next few days, I continued to soak it & move it left-right & up-down, until it was loose as a goose.