Yes but where is it actually supposed to be at optimal temps?
It tells you on the dip stick. The transmission fluid dip stick has a hot and cold level mark on it. After driving is should be at the hot level mark, first thing in the morning it should be at the cold level mark. There really isn't an optimal running temp since our all run at different temps depending on the area we drive.
Hmmm ok... I just installed my tranny cooler and leaked a little bit of fluid I refilled a bit of it today. I drove to the store and back about 15m highway and city and checked the dipstick, its between cool and hot maybe tomorrow more driving ill check again.
I wish I had an actual temp gauge, how hard is it to install one? i already have the ultragauge that po installed but it doesnt tell tranny temps
Not very hard. You'll need to cut the hose, install a t adapter, a couple hose barbs, and run the sensor for the gauge. I'm doing the exact some thing right now during my transmission swap. I'm going to use a Glow Shift gauge with extended wire harness.
After I posted I searched that youtube of them doing it on a RAM... I guess it's not to bad, Im guessing the 4runner doesnt have a service port we can use like the Ram?
and my truck is mostly a DD highway cruiser, but I am hoping to go overlanding in a couple of weeks to Montana, so hoping to get everything done before I leave.
You're making way too much out of this. If it's at operating temp and somewhere between the hot and cold marks you're good to go.
The fluid level in the pan moves more as you go up and down hills than the distance is between those marks. As long as the pump isn't starved or too full to the point of foaming it's fine.