overdrive

96 4runner 4wd Auto
I’ve looked at every forum on google it seems like but none of them are similar to my problem. The transmission shifts good 1-3 gear but after 3rd it won’t shift into overdrive. It gets in 3rd and as the speed increases the rpms increase and it won’t go into overdrive. yes i have the button on the shifter pushed in. It doesn’t have its days where it does shift or when the trucks warm or anything it never shifts into overdrive no matter what. Any ideas ? Thanks

 

What are your RPMs at when your on the freeway?

 

My car is doing the same thing, and ive checked everything. My rpms are 2000-3500 from 50mph-70mph