The shop should be able to do the flush with just the trans. but it might be more of a pain, transporting and working on, if it was not in the car.
I would clean the "muddy film" off the valve body, as it could hinder operation/performance.
I think the shudder is just from the TC itself, and can be easily solved by a new TC.
I would clean the "muddy film" off the valve body, as it could hinder operation/performance.
I think the shudder is just from the TC itself, and can be easily solved by a new TC.
I would recommend against flushing any automatic transmission. The chance of loosening some garbage that will dislodge itself and destroy the trans after all the work is done, is too high.
The "mud" you mentioned is probably the wearing surfaces of the clutches and what not, in the trans. That doesn't mean it's no good. Just that it has some miles on it. (There is no place for the debris to go, in an automatic. Just into the pan.)
I would clean the pan really well. Change the filter. Put it all back together and use the Ford TSB recommended trans fluid in it.
That's all.
The "mud" you mentioned is probably the wearing surfaces of the clutches and what not, in the trans. That doesn't mean it's no good. Just that it has some miles on it. (There is no place for the debris to go, in an automatic. Just into the pan.)
I would clean the pan really well. Change the filter. Put it all back together and use the Ford TSB recommended trans fluid in it.
That's all.