Indeed (mostly) and well done for actually looking at that discussion. However the 3/4 hub does have same weakness (sharp angles of dog keys cutouts) and also at least one of failures was a slider that is common across those gearboxes. - anyway this only cover total failure of the gearbox when in fact most will fail slowly by hammering the mainshaft bearing into the nosecone and 4 gear will start popping out. - and this is most common failure even when running 1600 engine. - so next time when you are bombing up that hill in 4th think of that overheating gear carving your gear housing.
but it will fail catastrophically plunging the whole of the Western world into meltdown, oh... you've a spare... that's fine then!
The revs will be all wrong when you put that much extra power through a 1600 box. When my 2110 went in with a 1600 box, I was in 4th gear very very quickly and 70mph was at about 4k rpm. Changed gearbox for one with 6 rib ratios and it was much better suited to the increased engine power , 70mph at approx 3200rpm. I went for a gearbox rebuilt by bears, but I now know this was a v bad decision & I should have gone for a more expensive one like @nobody s genuine 6 rib - rebuilt with nos parts. Use one of the gearbox calculators to work out what revs you will be doing at various speeds, tyre sizes make a difference as well.
My post isn't doom and gloom,its just based on reality. Fitted bigger engine, fond the revs were in the wrong place Pulled engine, changed box, all sorted I'd rather have got the correct gearbox when the engine first went in, as pulling it out again just cost more I haven't said the 1600 gearbox will blow up and im sure it wont
May be fine for you and t25, I found cruising at 4k in my bay noisy and not as relaxing as it is now 70mph is at lower revs
Yes, but no. The revs will be all wrong with a 6 rib too. @Sick Boy has run a 3 rib for ages. It really isn't a problem.