I need some opinions, my car was sittin for about a year with a spun bearing. I drove it to the shop recently to get fixed and when I got there I didn't have reverse. Worked perfectly before this. Now I have a new engine, but reverse only works once in a while, and only when the car is cold when it does work. I've already swapped valve bodies with one I knew worked and it didn't help. new filter and fluid too. what else might be wrong?