1989 Toyota truck repair question car not going to overdrive?

I have Toyota truck (pick up) and can't figure out why it doesn't go to overdrive. I recently replaced solenoid and there is power going to it. What else it could couse the ca not going to overdrive?1989 Toyota truck repair question car not going to overdrive?Why not do the simple thing, take it to a Toyota Dealer and tell them they should fix it and for nothing, cause trucks are supposed to have a lifetime warranty, I'd take my GMC in but nothing ever goes wrong with the darn thing.