Right procedure to remove gears on gearbox shaft ?

I haven't pulled apart the dino box but yes, that looks the same as the 308/328. I pulled the gears/bearings etc.. off one at a time. Both ends, you'll need to remove the ring nuts from both sides. Pull bearings.. it's been awhile but I recall hidden C clips or internal locking rings at various points, though that might be a different box... Sheesh time. I'll have to check some files for pics...
They're not hard to pull apart, though a big press really helps, I've got one of the BIG standing ones 20 ton.
When putting it all back together, heat the bearings in oil... They'll slip right into place.
I don't recall being able to pull it apart in "chunks" like you're asking though.
Thinking on this... It's the bearings that are pressed in place that hold it together. Those friggin bearings!

 

When I did gearboxes on a Porsche 915, the standing suggestion for removing a gear stack is ... gravity.

You place a nice 1/4 piece of steel on the garage floor. You hold the shaft/gear stack assembly 12 inches above the plate, and you drop it on the plate. The whole assembly (or most of it) will fall right off. Use a bearing puller on whatever is not coming out.

 

The 308/328 gearbox main and lay shafts do not have gears as part of the shaft. In other words all the gears come off the shaft.
So in your picture, the bearing on the right needs to be removed, then the 'dumbell' looking gear set will come off.

 

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nope, I'm only confusing everyone... the gear in the middle is part of the shaft, it transfers to the diff. and I think there's one or two smaller gears on the main shaft as well that are part of the shaft itself.

so in the above pic, R&1 and 2&3 on the shaft are removed in opposing directions, the transfer gear to the diff is part of the shaft and thus you can not press off in that direction. in order to remove the 2&3 stack you'll need to remove the bearing on the end and pull from that direction.

clear as mudd...

 

The gear is part of the shaft? As in, they’re both machined from the same piece of steel? Unusual in my opinion. Lots of material to hog out, for no reason.


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If you notice in the pics I posted, the gear next to the bearing is part of the shaft. Makes sense as that gear meshes with the differential. The pic below it is the rest of the gears assembled on the shaft.

 

All Porsche 915 gearbox has first gear integrated into the shaft. It is not unusual at all.