77 K10 transfer case noise

[jcondo]

I have a 1977 K10 with a np203, non part time kit.
When I bought the truck the P.O. had taken the speedometer drive gear out of the tail shaft. I reinstalled it and fixed the broken speedometer gear reducer shaft, and reconnected the speedometer gear to the instrument panel.
Now when I put it in gear and hit about 20 mph there is a grinding type of sound. What I wanna know is, what all is inside of the tail shaft when I remove it to inspect the speedometer gear on the shaft?
And if anyone has a parts list with listed parts for the entire np203 that would be great.