Run a good strech in reverse. Sometimes it will clear out the gov. and trash laying in the v-body.
As Maroon stated your mod valve could be bad also. That controls your shift points Its on the rt back side of your trans. If the vacum line to the valve is cracked or loose it can cause a shift problem. Check the lenght of it and its vacum.
Trans oil will come out when it wont shift. Alot of pressure builds and it will push out the vent hole.
__________________
Frank
|