OD is fed its apply fluid only through the 3rd gear circuit, meaning it may already be trying to go into OD as soon as or right after 3rd applies.
The speed sensor and computer are responsible for that.
Also keep in mind that when fluid changes temp it changes viscosity and that affects pressures, which in turn affects what the computer sees and reacts to.
This explains why it works different cold to hot.
The change in shifts with fluid temp makes sense to me. I wonder if an SCT or HP Tuners flash will help with this issue. I'm more so worried about transmission longevity rather than the slight fuel mileage increase this shifting is supposed to help.
