the guage is for KG/METRES OF TORQUE. not a percentage.
sooooo,. if you were to mesure the torque somehow at the front tailshaft with a torque wrench it could suply up to 50kg/m of torque before slipping.
its hard to explain. but its esentally a auto transmission that spends it life slipping. graduly feeding power to the front via a multi plate wet clutch
but. the power loss through 2wd/4wd. would be a good indication of how eficantly the transfercase is and how slippery the front dif oil is. also front wheel bearing drag.
so if anyone wants to do a back to back test with old diff oil and tranfercase oil.
then replace it all with new stuff and compare the differance id be interested at the results