1974 case 580 B splitting machine at torqe tube and final drive any advice

Manual was vague on the studs in the torque tube side of split theres six 2 larger on top 4 smaller below actually the manul only points to two on the high side anyway the main goal here is to replace pinion gear ill try getting some pics going any positive advice would be awesome

1974 case 580 B splitting machine at torqe tube and final drive any advice