tacoma high engine rpm when pulling tracker boat

I need some help/insight to find out if I need help or to accept what is happening when I tow my boat.

I have a Bass Tracker that totals 1250 lbs (boat & trailer) and shouldn't be a problem to tow. But, when I get on the interstate (transmission is out of overdrive) and get to 65 and 70 miles per hour the engine RPM's just climb higher to about 3200 and it doesn't shift. Is this normal or do I have a problem? It seems to me that the RPM's would come down to about 2000 after I obtain my cruising speed.

Can I just hit the button to go back to overdrive when doing 65/70 miles per hour and then take it out of overdrive when I need it?

FYI, I have a transmission oil cooler, the trans oil, filter and gasket were replaced about 500 miles ago. I have no problems driving the truck in overdrive or 4WD.

 

What your describing is normal for a first gen. The overdrive button also controls 4th gear, so basically you're crusing in 3rd. I would leave OD on and use the ECT button when towing. Only turn OD off if your transmission starts gear hunting