The facts are pretty simple you asked what gearboxes I had twice and you ignored my previous post or skipped it.
Do you want to compare my ex Nismo F5C56A opt 2 to a T50 stocky? You have to understand what an opt 2 commands these days and also Gordon Dobey who I mentioned earlier knew of these boxes inside out as he serviced them for the Nissan racing team locally and abroad.
I got the box from one of his clients and had no idea of their worth in those days just bought the car as deceased estate. Yet Gordon preferred to use the T50 himself for local racing for the same reasons Ive mentioned earlier.

You then say my experience has no bearing cause you and your brother have 2 boxes to compare? then why ask me what I had? which I answered already. You get a good 56a 4 speed and its only comparable to a toyota K40. You are talking chalk and cheese by comparing your 4 speed vs been around australia driven by every OZ teen bogon corolla box. Just using one example proves nothing you are right there however it is comical to think you praise your box so highly.

Since we are talking about 5 speeds, why on earth are you asking if I had a 4 speed close ratio box?! you need to read again we are talking 5 speeds, no offence but you are getting ridiculous in even asking and going over the same slate. I would not bother with a nismo 4 speed unless it had gearing that even Nismo didnt supply. You have to be more specific if you want some data or robotic answer to suit whatever its is you dont want to comprehend.

Also I dont need any history about Nismo or fanboy web data just the facts and experience shows clearly Nissan did not make the datsun box as quality and abundant as toyota has specifically the T series box for their A, K, T, 4age, R, S and other engines.

Take a look at the workings of a T50, the finish on the casting, the synchros sizing and every part of the T50 says quality. The Nissan just pumped them out and hoped owners didnt do skids with them.

My drama in the past with the t50 was the first gear choice and close ratios choices available seemed too expensive but Ive found fully optioned t50s for around the 2500aud mark and also a complete gearset from Argentina is possible for 1000usd.

If you can get yourself something like my old boxes and have the T50s to compare them on the road which is where most of our datsun spend time on you would have a different idea of quality.

Now if you want to be more pedantically stuck with Nissan are the best for every A series just ask other members what they think here of the datsun 5 speed boxes vs the t50 for track and rallye. Get more than a couple opinions. Try RC and some racers up north that use the T50 instead of often needs rebuilding datsun 56 and 60 series boxes.

I said it earlier if you prefer and are able to get the original gear in good condition go for it, I and other prefer the non original T50 behind an A.
Some prefer the 71b behind their boosted As and even that particular setup had issues using a quality 71 factory close ratio Z box!

Even here with my local Jp nationals the knowlege is clear that datsun boxes to Toyota are what suzuki boxes are to Honda.

My opt 2 CR box had a 2.67 first gear, so please do some more research and try to see that even that gear ratio is required for a good take off almost anywhere with a highly strung A series road or track.