Just for giggles, what about using an additive like the Lucas Oil stuff. any pros/cons to using/not using.
I have used this stuff and will continue to do so.
Had a TH 350 that wouldn't hardly move under its own power, but by dang I wanted to go wheeling.
Put lucas in it and it actually drove decent for about a day. Changed the fluid and put some more lucas in it and it lasted another 2 months or so. It still slipped just not so bad you couldn't drive it.
This is in a transmission that was just plain worn out no hard parts broken.
I would never put in in a newer trans but in an older one heck yes