I have a 91 Toyota pickup sr5 v6 auto 4x4 and won't shoft down into low buy its self I think it's the selinoid but I'm not sure what transmission I have 3 selinoid or 1 how can I tell and also I have a high pitch sound expecually when I'm In gear and taking off its not belts it sounds like its the transmission pls help !!!! Also what's the best way to test the selinoids

 

Transmission type is listed on the door.

http://personal.utulsa.edu/~nathan-b...autotrans.html