I have an issue with my tranny. I was taking out my speedometer and smoke came out of it and ever since that happened my tranny is like stock in last gear, and when u put in to gear or back into park tranny hits hard and its never done that. I put it on a scanner and it gave a code of p0758. So I changed the solenoid b & c wifh used ones that were good. And still doing the same thing. What else can it be?