Has anyone used Amsoil synthetic Transmission lube 75W-90 GL-4 in their 1969 4 speed?

Just wondering if any of you have used Amsoil synthetic Transmission lube 75W-90 GL-4 in their 1969 or earlier 4 speed. I will be rebuilding the transmission and was hoping to use this oil. It will be rebuild to stock specifications with new stop rings, bearings and seals.

Thanks