I have a 86 Toyota pickup and at times when I come to a stop, the trans won't down shift. When that happens, I have to put it in 1st. Can anyone help?

 

Dirty fluid, bad solenoids, contaminants in the valve body, bad transmission.....

I would research some of these issues, there are some good write ups on here

 

Thanks, I will check them out. Any other suggestions on which solenoids?

 

Just put new head gasket on my 86 2wd 22R. I put it in drive (has OD button) and take off. Shifts into 2nd fine.......will not shift to drive. Acts like a vacuum problem, as it was fine 2 days ago when I pulled it apart.......not so much now. Have tried several diagrams, none are exactly like mine as I bought it 4 years ago with already 120,000 on it. I have all vacuum lines hooked up and doesn't appear to be any leaks. Am lost for ideas now..........fluid is fine.