I have an 80 k5. 350 trans. unsure of t-case but is has gears instead of a chain. There is a shaft that comes out of the front of the t-case. it fits into a sleeve that is in the transmission. I have had to replace this sleeve 3 times in the last year. I'll be going down the road and the truck will just stop. No movement in 2wd or 4wd. Does anyone know why that shaft keeps tearing the splines out of that sleeve? It's getting expensive. I did have the transmission rebuilt but it has done it again. Thanks. There ain't no way I'll get stuck in that hole.....oops.