727 Buildup grease?

340mopar said
You should use only ATF when assembling an auto trans. The frictions and bands need to be soaked for a minimum of 4 hours so they are not not dry at all when installed. If they are dry at all they will burn up in the trans. I soak my frictions overnight.

Chuck
What he said, I use transgel or vasoline to hold thrusts and lube seal rings, etc.