Input shaft is the same also. It's only the front housing that's different.

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WRONG!!!!!!

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Also, there is a reasonable amount of disassembly required to get the front input shaft out of the gearbox. You can't just pull the front bell housing off, tap out the roll pin from the selector fork and pull it off. The gear on the cluster overhangs the top of the input shaft (over the gear that the selector ring engages with) which prevents you from pulling it off the end of the main shaft. You'll likely need to remove the tail housing, and dismantle ALL the gears from the main shaft. Then take the circlip off the main shaft. (I can't recall off the top of my head if thats under a plate screwed to the center plate, or if that plate is on the top side of the center plate) Anyway you must remove the circlip from the mainshaft on the rear side of the center bearing, then you've got to drive the rear of the mainshaft forwards far enough to enable the removal of the cluster before you''ll be able to get the input shaft out.
Not a big deal if you've had some experience with gearboxes, but not a 5 minute job for a novice.

as b310gx said, there isnt a 63a normal pattern stumpy box
so the one in the stanza would be a r30 stumpy, there isnt that much of a difference between the stanza box and the r30 box in size...unless they are sitting next to each other then its kinda obvious

would be best off just putting new bearings in the sss box, its not that hard to do

yeah forgot to mention im a mechanic, and have stripped down a 60 series box so i should be ok with the 63, if not i can get access to a workshop manual.
pigdog by sss box you mean the dogleg a series box i have?
both of the boxes look identical, but its still in the car so ill leave my investigating until i get it out. so it could very well be just a random nissan box that looks like the 63 ive got.

You should be able to manage then. But I found the 63, considerably more difficult to do that a 60. If you're a pro, it shouldn't be beyond you.