I recall it was 75W-80 but now it looks like it's advertised as 75W-75? Did the formulation change since then?
https://www.bgprod.com/catalog/driveline/bg-syncro-shift-ii/
> BG Syncro Shift® II is an API GL-4 gear lubricant blended t...
https://www.bgprod.com/catalog/driveline/bg-syncro-shift-ii/
> BG Syncro Shift® II is an API GL-4 gear lubricant blended t...