Sorry I thought I answered your questions before you asked them 3 posts ago!

However again yes to all your queries and yes I know of the issues Bill faced for the gearbox over 10 years ago thats why I asked you to read it, he used to run A series in the past behind all kinds of nissan boxes and later moving to the G13b legendary all alloy suzuki motor chose the t50 for many reasons Ive mentioned. Also if you are racing or restoring an original or historic spec race datto its hard to go past a nismo box thats a given, no arguments there.

For the average datsun guy the T50 is the winner but for the rare datto boxes some skill is required to make them live longer. Ive had T50s in celicas, corollas and in more than one datsun, they are all superior boxes to any nissan 56,60 and even 63 series stock and close ratio. I would not just thump the T50 on a race track for the fun of it, I do have mechanical sympathy for any make of car but you are being a little out of context by stating the race track which is what most datto guys here dont ever sniff and mainly dream about. The longevity of datsun gearboxes is an issue.

Now to elaborate further - I sold my close ratio 56a which was fully recoed and after a year behind an A16 2nd started to crunch, new straight cut gears were used on 1st and 2nd after its last rebuild and stripped 2nd gear gearing down from 4th and 3rd at calder. I treated that engine like my previous R100 bridgeport but I treat all gear changes with upmost respect. The T50 I used no cluth on was due to a broken clutch cable on the way home from a cruise, now I had the same issue on a fresh 60L and ruined that box behind a highly strung A14 I just acquired from a deceased estate with all work done by ex-nissan race mechanic Gordon Dobey a works datsun 1000 mechanic in the 60s when they won at bathurst. The strength of datsun 56 and 60 series boxes is similar to suzuki boxes they wear quickly after 200k.

Ive owned plenty of gearboxes from mazda, triumph, rovers, jags, nissan, mitsu, bogon taxis, vw, bmw, benz and have a large circle of mates from 35-70 into cars, with myself 46 big ones and Toyota and T5 world class boxes are the cream of afford ability and logic.

Even a good 63L behind a Stanza doesnt last long with a stock L16 and behind a 180b sss with stock twin su L18 also has a short life and even a well setup 71b behind a strong L28 has issues once you race them with stock internals and gearing. Nissan boxes require tweaking many box people dont know about unless they are datsun die hards. Yet you walk into many reco places and they are like what a datto box, yeah we do them but we do mainly whoredens and frauds etc.

A w58 which is equivalent to a 71c ca18det box is superior and yet lighter.
Toyota knows gearboxes better than Nissan always has and even "used" or copy Porsche knowhow for the better German synchros as the Japs could not duplicate the same quality or design for them. Toyota also went to Yamaha to design better heads, Nissan studied other makes. Japanese have always copied and gone from there.

Even the Nissan boxes outweigh the equivalent Toyota variants

Now if you read my post before hand you would again not have to ask the same questions again. If you prefer datsun go for it, I prefer toyota for gearboxes behind an A series and if you go racing you can buy a t50 close ratio race setup with all the good stuff done to it for 2500aud to 3k if you know where to look.

Also given the chance I would go a stumpy 71c with close ratio setup if someone made the adaptor plate for it but would also go a T5 bw world class box from a 86+ chevy s-10. Those boxes are 35kg and close ratio gearsets cost 1095usd for any ratio choice under the sun.

Now the T50 is used by plenty on this forum and although I would love a close ratio version again as I had in my old ta22 with 1900cc 2tc. I would settle for a stocky again than a datsun one which are too rare now to mistreat or rebuild without costing a kidney.

All interesting though but that kit on Jap yahoo is just for locals we in Oz have the Dellows as mentioned earlier.

At least we have choices but in reality our choices are getting more and more expensive. Thats something corollas peeps never have an issue with and must say corolla peeps are worse drivers than datto guys. Corolla owners are more tight reared than almost any car owner. When you deal with lots of them you just can wait to deal and trade with datsun peeps.