1976 Chevrolet Scottsdale K20 question

[Mr S.]

Hello, This is my first post and I'm not real good with computers, I tried to use the search bar but I think I did it wrong?

I have a 1976 Chevy scottsdale K20, It's a full time four wheel drive pickup.

I'm having troubles with my transfer case, Its hard to shift through all the selections. Its hard from Hi to Hi-loc, hard from L to Lo-loc hard through all of them. I mean putting feet on dash and yanking on it hard. Moving doesn't seem to help Ive been in Neutral rolling forward rolling backward. Everything.

BUT when its really warmed up and I have been driving it most the day it switchs nice and easy?

Please help I'm new to the four wheeldrive parts. Thanks Josh.