being it's a 2 speed case it should be 1 to 1 in high and and 1.62 to 1 in low, meaning high is direct,low is 1.62 turns of the input shaft to turn the output shaft 1 turn,not being able to see it sounds like the case that was used in cranes,skidders,loaders,military trucks ect. ,I would say there were some different ratios and I've seen several modifications added to them,those cases had a top shaft for input, a middle shaft for gear ratios and a bottom shaft for output and fwd,the fwd shaft used a direct jaw coupling to connect to the bottom output shaft for fwd it turned at the same speed as the output shaft,i've seen them used backwards for and overdrive also,as you mentioned you can use another brand case if the ratios are close,but beware a lot of the military truck cases had an under driven sprag locking system for the fwd they wouldn't work good in a tractor,if your case is apart count the gear teeth and see if it's 1:1 in high 1.62:1 in low,or if it's together put it in high and mark the top and bottom shaft turn the top shaft 1 complete turn and see if the bottom turns 1 complete turn if so you have 1:1 in high.
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