Having 2-3 shift overlap - Thinking of switching from 4.2 apply lever to 3.8 - Any Other Thoughts?

Thanks. I’m running type F but would have to open it up further to verify the other things unless I can find some old photos. I planned to put the same fluid back in that I drained out. Not sure if switching fluids would be safe at this point?
Actually, the 2-3 overlap is the worst if I'm coasting and shift to 3rd. This is a street driven car, mainly.