4L60E, Changing fluid help

Well to make a long story short my 4L60E started doing what 4L60Es do(****ing suck). The 2-3 shift was always horrible(even with HPTuners adjustments) but now 2nd gear slips even under light/regular loads. Figured it's probably a good time to change the fluid and maybe throw some Lucas or some other stop-slip type liquid in there.

Just wondering what combination of products do you suggest that will hopefully keep the damn thing together until I get that Performabuilt Lvl 2 I've been looking at. Oh and are there any writeups on on changing the fluid? That damn rear mounted trans confuses me just thinking about it
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