My T100 (auto) sometimes will not shift into overdrive until I have driven it for a few miles. It will then kick in and be fine for a while. It only does this after it has not been driven for a few days or maybe a week.

I had the transmission fluid flushed a while back but it did not help. Any thoughts?

My T100 (auto) sometimes will not shift into overdrive until I have driven it for a few miles. It will then kick in and be fine for a while. It only does this after it has not been driven for a few days or maybe a week.

I had the transmission fluid flushed a while back but it did not help. Any thoughts?
Sounds perfectly normal by design. Overdrive is locked out until the transmission warms up. My new 07 Tundra is the same way.

I have other vehicles with overdrive and none of them do this. It does not seem to be getting any worse though so you might be right. It runs the RPMs up pretty high when you run 60mph in third gear.

I have other vehicles with overdrive and none of them do this. It does not seem to be getting any worse though so you might be right. It runs the RPMs up pretty high when you run 60mph in third gear.
Are the other vehicles late model Toyotas? None of my Hondas do this, but it is well dosumented with the new Tundra.

Are the other vehicles late model Toyotas? None of my Hondas do this, but it is well dosumented with the new Tundra.

No my other vehicles are not Toyotas. I did have a 2000 Tundra a while back and it did not do this.

You're driving 60 MPH when the engine is stone cold?

My T100 (auto) sometimes will not shift into overdrive until I have driven it for a few miles. It will then kick in and be fine for a while. It only does this after it has not been driven for a few days or maybe a week.

My '93 pickup and my '03 Tundra both will not shift into overdrive until the trans operating temp is reached, about 134' on the Tundra.

You're driving 60 MPH when the engine is stone cold?

I have a quarter mile or so of dirt driveway that I travel on before I hit the highway so it has a chance to warm up a little.

Maybe I am worrying over nothing. If other toyotas do this then I guess it is fine. It shifts good and gives no other problems so maybe it is just a thing where it needs to warm up first.