how to remove 4 speed

[wammer]

i want to replace the clutch, 68 gmc 4x4 i have removed rear drive shaft ,disconnected shift linkage,speed cable, e-brake cable,front drive shaft,hump cover and seat from cab. exhaust pipes are clear. Q should i remove trans and transfer case in one piece or take transfer case off first? i tried to remove transfer case by removing 5 or 6 bolts from it but it seems like something else is holding it together. man i need to get a service manual.