e.g.
Auto Gallery Yokohama gearsets (rebuilt boxes).
yes there are upgraded synchro boxes available. I have one in my 32. made by auto gallery yokohama (Koizumi)
it's a good box. i've used it for about 5 years with no drama.
you can do a mix of the OS box and AGY bits.
DJR81, they have their own double cone synchros. they also do various different close ratio gear sets too just like OS Giken.
they do a nice transfer case overhaul too.
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ratio choice:
version 1
1= 2,611
2=1,733
3=1,289
4=1,000
5 =0,752
OR (standard ratios I think?):
1 3,214
2 1,925
3 1,302
4 1,000
5 0,752
They have some optional 5th gear choices too:
5 0,842
5 0,826
5 0,800
version 2 close ratio box is:
1 1,903
2 1,476
3 1,186
4 1,000
5 choice of the 3 above.