hi, could someone try and help me...we just replaced the transmission in our truck because it wasn't shifting out of low gear...the one we put in worked perfect and then started doing the same thing, not shifting. Any ideas?

 

when you changed the tranny, did you change the torque converter? Correct me if I'm wrong, but isn't that what tells the tranny to change gears. When it builds up enough torque to whift it to another gear.