please help! front rotor removal 85' k-20

[theugly]

hey all,

pretty new to this place hoping someone can help me out here. ive never done a brake job on a 4x4 front axle like this and im kinda stuck.

ive removed the warn hub-lock cover and took off the c clip which fits into the grove in the spline. on that spline is a bunch of crap i am unfamiliar with but it has roughly half an inch of foward-rearward movement. i know it needs to come off but i cannot see any other c clips or locking devices to remove.

can someone point me in the right direction here? i know i should have a service manual and i will try to buy one asap but for right now the trucks down and id really appreciate some help from someone who knows what there doing. 25 degrees and windy is no time to sit there and try to tinker hahaha. thanks in advance to anyone who can help a fella out.

if anyones interested il try to get a pic or 2 of the rig up on here.