99 T/A reverse lockout problem
When shifting 4 -> 5 at high speed/rpm it doesn't lock out reverse. On a few occasions it's let the shifter go to reverse, it doesn't engage obviously, just grinds horribly. My uncle even said, after I did a flyby, he saw the reverse lights come on. When it happens I have to be super careful, like, I feel/hear the grind, I immediately clutch in and throw it in nuetral, but even for a few seconds it easily allows the shifter all the way to the right, so i literally have to search for 5th. It works fine in normal conditions. Can't engage reverse with car off; engages reverse fine when needed; blocks reverse in normal 4 -> 5 shifts at highway speeds. Only happens at 'racing' speeds/RPMs. Is the solenoid going bad? I don't think I'm just powering through the solenoid. Any ideas?