no 3 to 4 shift even after replacing valve body
 

I have a 95 SC coupe DOHC
168000 miles on it.
It shifts 1 to 2 to 3 but not to 4, It also shifts to reverse with no issues other than 3 to 4? I replaced the valve body, same issue. I cannot trust the SES light because the previous owner disconnected the connector to check the code. No issues prior to the trans flush that was done.

Why did you change the valve body, who told you to change the valve body, what did it do before you changed the valve body, where did you get replacement valve body, why did you place this post in an area set up for suggestions and help with the forum?

I moved your post to a better location. I move one post per person any others get deleted.