The procedure to do this is referred to in Chapter 1 of Haynes. If you've done it before and know what the parts look like the procedure makes sense. If you haven't had eyes-on the parts its confusing. So these photos should help...
Hint: Use all holes in the trans case to LOOK at the parts referenced herein.
This is the fork that the thrust bearing retains preventing separation of the trans & engine.
With the tension released (using M6 x 12 SHCS & washers) tap a 'ear' at a tangent to rotate the bearing relative to the spring plate until the fork is no longer retained by the ears. Notice the 2 flat cuts 90 degrees from the ears. The bearing must rotate until the flats are next to fork legs. The fork will be 'wobbly' when this happens. The trans & engine should now separate.