Might be the angle,but if you look at the ribbing pattern, you can see its the late ute 56a 4 speed gearbox.
I also have an early type 56a 4 speed and you can see the difference of the ribbing.
This one is off an 1984 ute.

Yes, I see the triangle over the starter bulge

Il post up the comparo pics soon.
Pics are on a mates laptop....

I'm wondering if the wider gears are 5-speed only. Since the late-model 4-speed has slight improvements over the early 4-speed, maybe the 5-speed has wider gears than all 4-speeds?

hey dd,

I can only talk for the nismo 56A 5 Speed close ratio gearbox i own and its comparison to the last iteration of the "strong" ute gearbox i own.The nismo box has got Bigger and larger gears than the late ute gearbox.No one gear is interchangable btw the two due to width and size difference.Also because of the two very different synchromesh systems.

Its hard to tell,and not a fact,just an assumption,but my observation is that the nismo gearbox used a different type of material for the gears.its easy to see where the price difference comes in once you compare the two gearboxes.

I and my good mate, a mechanic,had long suspected that the nismo gearbox would require an lsd type oil, different type of gear oil as compared to the 4speeds due to its porsche patented synchromesh system.
I was able to ask Kazumasa Hirota what they run on their tomei hirota b110 and they use Wakos WR75-90 for their nismo close ratio 56A 5 speeds.Thats a GL5 lsd type oil.I will look for the equivalent in australia

I have opened up an early 56a 4speeds and the late 56a 4speeds do have slightly wider gears.

I would also be inclined to believe the gx5 5 speed gearbox would have wider and larger gears than the 4 speed as these gearboxes came behind 83hp a12 gx engines as opposed to the 69hp a12 engines.

hey dd,
Just posted up some comparo pics btw F5C56A vs Late ute gearbox under album
cheers