You need the service limits from the manual,it would also tell you,to check the springs and friction plates with a micrometer,check the metals with this also,and the metals need to be checked for warpage.Any grooves in the inner hub,in the splines where the metals engage on it,are there ridges or lips on the hub faces where the frictions ride.The outer basket,are there grooves on the fingers where the notches on the frictions lock?Did it smell like but when you drained the oil,low oil could have roasted your plates,what color are the metals?You really need proper reference,a manual