Have a 1978 F250, Dana 44 front, axle seal at the diffy/axle tube is leaking, allowing fluid to run down the tube and out at the U-joint. Got the dust cover off with the Free/Lock selector, and the snap ring off. Now, how do I get that splined collar out of there??? According to the Chiltons, you pull it out. I have a little rim that won't allow that. Any help would really be appreciated.