A855 - 5 Speed

yeah....I'm not sure what the material is (we called it clutch facing, like on an automatic trans clutch) but in the late 90's there were guys not wanting to buy the expensive Mopar fluid for their T56 Viper gearboxes, so they used GL-5. It would dissolve/eat up the facing adhesive and didn't take long for the whole thing to become a slop-mess inside. And, this is one of those rare cases when pouring in a bottle of that transmission restorer fluid didn't help.