46re transmission help

Yes...the front half is a 727.....and there is the overdrive...I have done several 46rh and 46re ...and a 42rh......

you can do it....
I noticed that the 46rh is from like 89-95 and the 46re is 96-03 so I'm assuming this one is a re. What is the difference between them?
What goes bad in these that causes them to slip? Do the clutch (friction plates) need replaced?