If you intend to disassemble the bearing plate further (i.e. for center bearing replacement) and/or took apart one or more clutch hubs please read on.
Depending on your reverse gear your bearing plate is either still completely assembled or partly disassembled with the cover off. Completely assembled:
Partially disassembled:
Assuming your bearing plate is fully assembled start by removing the 6 bolts, noting two are different, to remove the cover.
Next, remove the idle gear and its two spacers. It's probably not required but I made note of which spacer was on each side and its orientation. Now the assembly looks like the second picture above. Again, you may already be at this step.
Note the main bearing can only be pushed out through one side. Support the bearing plate and use whatever method you prefer to drive it out.
The center countershaft bearing has a c-clip around it. The c-clip does not need to be removed to push out the bearing. Both bearings removed:
Bearings with c-clips and shims:
The shims fit between the bearing plate lip and the mainshaft center bearing and the c-clip and bearing plate for the countershaft bearing. Again, clearances (consult FSM). These can also be sharp so be careful. If you want to go further you can unbolt and remove the idler gear shaft but I did not do that.
If you took apart a clutch hub to remove it or are just curious about how they work work read on. All of the clutch hubs are basically the same with the only real difference being size.
Each clutch consists of a inner hub, which is fixed to the mainshaft, an outer locking ring, which serves to connect the hub with the drive gear, three keys to control the outer ring's movement, and two wire springs to hold the keys in place. To disassemble, if not done already, simple slide the outer ring off the inner hub making sure none of the keys or springs going flying off into space.
If you look at the ID of the hub you notice one side is chamfer and the other isn't. Pay attention to this when installing as the chamfers must point a certain way (check the FSM).
Assembly note: reassembling the clutch is fairly straightforward but there is a "right" way to do it. Place the keys in the outer grooves in the hub with the taller, center section pointing outward. You'll notice some of the teeth in the outer ring are missing a center section. Align these modified teeth with the keys and slide the outer ring over the hub. Lastly, install the wire spring by inserting the bent end into the hole and winding it around the hub. The wire must contact each key and must be "inside" the inward-pointing sections on the keys. It's a little tricky as one side often comes undone when you try to do the other.
That's pretty much it. I see this has already been made a sticky so that's a start. Feel free to ask any questions!